E Samei

Summary

Affiliation: Duke University Medical Center
Country: USA

Publications

  1. ncbi request reprint Evaluation of a flat panel digital radiographic system for low-dose portable imaging of neonates
    Ehsan Samei
    Department of Radiology, Duke University, DUMC 3302, Durham, North Carolina 27710, USA
    Med Phys 30:601-7. 2003
  2. pmc Introduction to grayscale calibration and related aspects of medical imaging grade liquid crystal displays
    Kenneth A Fetterly
    Department of Diagnostic Radiology, Mayo Clinic, Rochester, Minnesota, USA
    J Digit Imaging 21:193-207. 2008
  3. doi request reprint DQE of wireless digital detectors: comparative performance with differing filtration schemes
    Ehsan Samei
    Carl E Ravin Advanced Imaging Laboratories, Department of Radiology, Medical Physics Graduate Program, Duke University Medical Center, Durham, North Carolina 27705, USA
    Med Phys 40:081910. 2013
  4. doi request reprint The effect of dose heterogeneity on radiation risk in medical imaging
    Ehsan Samei
    Carl E Ravin Advanced Imaging Laboratories, Duke University, Durham, NC, USA
    Radiat Prot Dosimetry 155:42-58. 2013
  5. doi request reprint Assessment of multi-directional MTF for breast tomosynthesis
    E Samei
    Carl E Ravin Advanced Imaging Laboratories, Department of Radiology, Duke University Medical Center, Durham, NC 27705, USA
    Phys Med Biol 58:1649-61. 2013
  6. ncbi request reprint Performance evaluation of computed radiography systems
    E Samei
    Department of Radiology, Duke University Medical Center, Durham, North Carolina 27710, USA
    Med Phys 28:361-71. 2001
  7. ncbi request reprint Luminance and contrast performance of liquid crystal displays for mammographic applications
    E Samei
    Depts of Radiology, Physics, and Biomedical Engineering, Duke University, DUMC 3302, Durham, NC 27710 USA
    Technol Cancer Res Treat 3:429-36. 2004
  8. ncbi request reprint Fundamental imaging characteristics of a slot-scan digital chest radiographic system
    Ehsan Samei
    Digital Imaging Research Division, Department of Radiology, Duke University, DUMC 3302, Durham, North Carolina 27710, USA
    Med Phys 31:2687-98. 2004
  9. pmc Toward clinically relevant standardization of image quality
    Ehsan Samei
    Department of Radiology, Physics, and Biomedical Engineering, Duke University, Durham, North Carolina, USA
    J Digit Imaging 17:271-8. 2004
  10. ncbi request reprint AAPM/RSNA physics tutorial for residents: technological and psychophysical considerations for digital mammographic displays
    Ehsan Samei
    Duke Advanced Imaging Laboratories, Department of Radiology, Duke University, DUMC Box 3302, Durham, NC 27710, USA
    Radiographics 25:491-501. 2005

Detail Information

Publications91

  1. ncbi request reprint Evaluation of a flat panel digital radiographic system for low-dose portable imaging of neonates
    Ehsan Samei
    Department of Radiology, Duke University, DUMC 3302, Durham, North Carolina 27710, USA
    Med Phys 30:601-7. 2003
    ..The rapid availability of flat-panel images in portable imaging was found to be an added advantage for timely clinical decision-making...
  2. pmc Introduction to grayscale calibration and related aspects of medical imaging grade liquid crystal displays
    Kenneth A Fetterly
    Department of Diagnostic Radiology, Mayo Clinic, Rochester, Minnesota, USA
    J Digit Imaging 21:193-207. 2008
    ..Both grayscale and color displays are considered, and the influence of ambient light on calibration and perception is discussed...
  3. doi request reprint DQE of wireless digital detectors: comparative performance with differing filtration schemes
    Ehsan Samei
    Carl E Ravin Advanced Imaging Laboratories, Department of Radiology, Medical Physics Graduate Program, Duke University Medical Center, Durham, North Carolina 27705, USA
    Med Phys 40:081910. 2013
    ....
  4. doi request reprint The effect of dose heterogeneity on radiation risk in medical imaging
    Ehsan Samei
    Carl E Ravin Advanced Imaging Laboratories, Duke University, Durham, NC, USA
    Radiat Prot Dosimetry 155:42-58. 2013
    ..However, for leukaemia, they were found to significantly under-represent the risk when the organ dose distribution is heterogeneous. A systematic study is needed to develop a risk model for heterogeneous dose distributions...
  5. doi request reprint Assessment of multi-directional MTF for breast tomosynthesis
    E Samei
    Carl E Ravin Advanced Imaging Laboratories, Department of Radiology, Duke University Medical Center, Durham, NC 27705, USA
    Phys Med Biol 58:1649-61. 2013
    ..The presented method of separating the effective resolution and artifacts from the measured ESF was found experimentally implementable and is expected to facilitate the interpretation of MTF measurements in tomosynthesis...
  6. ncbi request reprint Performance evaluation of computed radiography systems
    E Samei
    Department of Radiology, Duke University Medical Center, Durham, North Carolina 27710, USA
    Med Phys 28:361-71. 2001
    ..This paper further clarifies the recommendations with respect to the beam filtration to be used for exposure calibration of the system, and the calibration of automatic exposure control systems...
  7. ncbi request reprint Luminance and contrast performance of liquid crystal displays for mammographic applications
    E Samei
    Depts of Radiology, Physics, and Biomedical Engineering, Duke University, DUMC 3302, Durham, NC 27710 USA
    Technol Cancer Res Treat 3:429-36. 2004
    ..Notwithstanding the findings, other factors such as matrix size, angular response, and color functionality should further be taken into consideration...
  8. ncbi request reprint Fundamental imaging characteristics of a slot-scan digital chest radiographic system
    Ehsan Samei
    Digital Imaging Research Division, Department of Radiology, Duke University, DUMC 3302, Durham, North Carolina 27710, USA
    Med Phys 31:2687-98. 2004
    ..43 in the mediastinum. The findings indicated that the slot-scan design provides marked scatter reduction leading to high effective DQE (DQEeff) of the system and reduced patient dose required to achieve high image quality...
  9. pmc Toward clinically relevant standardization of image quality
    Ehsan Samei
    Department of Radiology, Physics, and Biomedical Engineering, Duke University, Durham, North Carolina, USA
    J Digit Imaging 17:271-8. 2004
    ..Implementation of these three initiatives may further the reach and impact of DICOM toward quality medicine...
  10. ncbi request reprint AAPM/RSNA physics tutorial for residents: technological and psychophysical considerations for digital mammographic displays
    Ehsan Samei
    Duke Advanced Imaging Laboratories, Department of Radiology, Duke University, DUMC Box 3302, Durham, NC 27710, USA
    Radiographics 25:491-501. 2005
    ..Because display devices are susceptible to variations in hardware and calibration and to degradation over time, acceptance testing and quality control testing are necessary to maintain an adequate level of display quality...
  11. ncbi request reprint Comparative scatter and dose performance of slot-scan and full-field digital chest radiography systems
    Ehsan Samei
    Duke Advanced Imaging Laboratories, Department of Radiology, Duke University Medical Center, DUMC 3302, Durham, NC 27710, USA
    Radiology 235:940-9. 2005
    ..To evaluate the scatter, dose, and effective detective quantum efficiency (DQE) performance of a slot-scan digital chest radiography system compared with that of a full-field digital radiography system...
  12. ncbi request reprint Assessment of display performance for medical imaging systems: executive summary of AAPM TG18 report
    Ehsan Samei
    Duke Advanced Imaging Laboratories, Department of Radiology, Duke University, DUMC 3302, Durham, North Carolina 27710, USA
    Med Phys 32:1205-25. 2005
    ..01 for primary displays. The report offers further descriptions of prior standardization efforts, current display technologies, testing prerequisites, streamlined procedures and timelines, and TG18 test patterns...
  13. ncbi request reprint A comparative contrast-detail study of five medical displays
    Ehsan Samei
    Duke Advanced Imaging Laboratories, Department of Radiology, Duke University, Durham, North Carolina 27710, USA
    Med Phys 35:1358-64. 2008
    ..The findings suggest that 5 and 3 megapixel monochrome LCDs provide comparable but subtly superior contrast detectability than other tested displays, with the former performing slightly better in the detection of subtle and fine details...
  14. ncbi request reprint Digital mammography: comparative performance of color LCD and monochrome CRT displays
    Ehsan Samei
    Duke Advanced Imaging Laboratories, Departments of Radiology Physics and Biomedical Engineering, and Medical Physics Graduate Program, Duke University Medical Center, Durham, NC 27705, USA
    Acad Radiol 14:539-46. 2007
    ..To evaluate the comparative performance of high-fidelity liquid crystal display (LCD) and cathode ray tube (CRT) devices for mammography applications, and to assess the impact of LCD viewing angle on detection accuracy...
  15. pmc Effective DQE (eDQE) and speed of digital radiographic systems: an experimental methodology
    Ehsan Samei
    Department of Radiology, Carl E Ravin Advanced Imaging Laboratories, Medical Physics Graduate Program, Duke University and Medical Center, 2424 Erwin Road, Suite 302, Durham, North Carolina 27705, USA
    Med Phys 36:3806-17. 2009
    ....
  16. pmc Biplane correlation imaging: a feasibility study based on phantom and human data
    Ehsan Samei
    Carl E Ravin Advanced Imaging Laboratories, Department of Radiology, Duke University, Durham, NC 27710, USA
    J Digit Imaging 25:137-47. 2012
    ..The findings suggest that the BCI technique has the potential for clinical implementation as a cost-effective technique to improve the detection of subtle lung nodules with lowered rate of false-positives...
  17. doi request reprint Effective dose efficiency: an application-specific metric of quality and dose for digital radiography
    Ehsan Samei
    Carl E Ravin Advanced Imaging Laboratories, Duke University, Durham, NC 27710, USA
    Phys Med Biol 56:5099-118. 2011
    ..Demonstrated for chest radiography, the eDE shows promise as an application-specific metric of imaging performance, reflective of body habitus and radiographic technique, with utility for radiography protocol assessment and optimization...
  18. ncbi request reprint An experimental comparison of detector performance for computed radiography systems
    Ehsan Samei
    Departments of Radiology and Biomedical Engineering, Duke University, DUMC, Durham, North Carolina 27710, USA
    Med Phys 29:447-59. 2002
    ..The one high-resolution screen tested had reduced DQE and increased MTF at high frequencies...
  19. ncbi request reprint An experimental comparison of detector performance for direct and indirect digital radiography systems
    Ehsan Samei
    Department of Radiology, Duke University, DUMC 3302, Durham, North Carolina 27710, USA
    Med Phys 30:608-22. 2003
    ..5 mm(-1) were 64% (64%) and 20% (15%) for the XQ/i system, and 38% (38%) and 20% (20%) for the DRC, respectively. The DQE results of the DiDi system were difficult to interpret due to additional preprocessing steps in that system...
  20. ncbi request reprint Subtle lung nodules: influence of local anatomic variations on detection
    Ehsan Samei
    Department of Radiology, Duke University Medical Center, DUMC 3302, Durham, NC 27710, USA
    Radiology 228:76-84. 2003
    ..To assess the influence of local anatomic noise on the detection of subtle lung nodules depicted on chest radiographs...
  21. ncbi request reprint Image quality in two phosphor-based flat panel digital radiographic detectors
    Ehsan Samei
    Department of Radiology, Duke University, DUMC 3302, Durham, North Carolina 27710, USA
    Med Phys 30:1747-57. 2003
    ....
  22. ncbi request reprint AAPM/RSNA tutorial on equipment selection: PACS equipment overview: general guidelines for purchasing and acceptance testing of PACS equipment
    Ehsan Samei
    Department of Radiology, Duke University, DUMC Box 3302, Durham, NC 27710, USA
    Radiographics 24:313-34. 2004
    ..After the PACS has been installed, the user should perform technical and clinical acceptance testing to ensure that the system meets expectations...
  23. ncbi request reprint A framework for optimising the radiographic technique in digital X-ray imaging
    Ehsan Samei
    Duke Advanced Imaging Laboratories, Duke University Medical Center, Duke University, Durham, NC 27710, USA
    Radiat Prot Dosimetry 114:220-9. 2005
    ..The general findings highlight the fact that the techniques that are conventionally assumed to be optimum may need to be revisited for digital radiography...
  24. doi request reprint Dual-energy contrast-enhanced breast tomosynthesis: optimization of beam quality for dose and image quality
    Ehsan Samei
    Carl E Ravin Advanced Imaging Laboratories, Department of Radiology, Duke University Medical Center, Durham, NC 27705, USA
    Phys Med Biol 56:6359-78. 2011
    ..The optimum technique provides best visibility of iodine against structured breast background in dual-energy contrast-enhanced breast tomosynthesis...
  25. pmc Micro-CT imaging of breast tumors in rodents using a liposomal, nanoparticle contrast agent
    Ehsan Samei
    Duke University, Durham, NC, USA
    Int J Nanomedicine 4:277-82. 2009
    ..The image data showed good qualitative correlation with pathologic findings. The approach holds promise for studying tumor angiogenesis and for evaluating anti-angiogenesis therapies...
  26. ncbi request reprint Physical characterization of a prototype selenium-based full field digital mammography detector
    Robert S Saunders
    Duke Advanced Imaging Laboratories, Departments of Physics and Radiology, Duke University, Durham, North Carolina 27710, USA
    Med Phys 32:588-99. 2005
    ..Nevertheless, the DQE showed strong exposure and frequency dependencies. The results indicated that the detector offered high MTFs and DQEs, but structured noise effects may require improved calibration before clinical implementation...
  27. doi request reprint The influence of increased ambient lighting on mass detection in mammograms
    Benjamin J Pollard
    Duke Advanced Imaging Laboratories, Department of, Duke University, Durham, NC, USA
    Acad Radiol 16:299-304. 2009
    ..This study was designed to examine the effect of a controlled increase of ambient lighting in mammography reading rooms on the diagnostic performance of breast imaging radiologists...
  28. ncbi request reprint Effect of dose reduction on the detection of mammographic lesions: a mathematical observer model analysis
    Amarpreet S Chawla
    Duke Advanced Imaging Laboratories, Department of Radiology, Duke University Medical Center, Durham, North Carolina 27705, USA
    Med Phys 34:3385-98. 2007
    ..Dose reduction did not have a statistically significant effect on detection of microcalcifications. The model results indicate that there is room for optimization of dose level in mammographic screening procedures...
  29. doi request reprint Can compression be reduced for breast tomosynthesis? Monte carlo study on mass and microcalcification conspicuity in tomosynthesis
    Robert S Saunders
    Department of Radiology, Duke Advanced Imaging Laboratories, Duke University Medical Center, 2424 Erwin Rd, Suite 302, Durham, NC 27710, USA
    Radiology 251:673-82. 2009
    ..To assess, in a voxelized anthropomorphic breast phantom, how the conspicuity of breast masses and microcalcifications may be affected by applying reduced breast compression in tomosynthesis...
  30. ncbi request reprint Does image quality matter? Impact of resolution and noise on mammographic task performance
    Robert S Saunders
    Duke Advanced Imaging Laboratories, Department of Radiology, Duke University Medical Center, Durham, North Carolina 27705, USA
    Med Phys 34:3971-81. 2007
    ..The primary conclusions of this study suggest that quantum noise appears to be the dominant image quality factor in digital mammography, affecting radiologist performance much more profoundly than display resolution...
  31. ncbi request reprint Measurement of the detective quantum efficiency in digital detectors consistent with the IEC 62220-1 standard: practical considerations regarding the choice of filter material
    Nicole T Ranger
    Duke Advanced Imaging Laboratories, Department of Radiology, Duke University, Durham, North Carolina 27710, USA
    Med Phys 32:2305-11. 2005
    ....
  32. doi request reprint Low-tube-voltage, high-tube-current multidetector abdominal CT: improved image quality and decreased radiation dose with adaptive statistical iterative reconstruction algorithm--initial clinical experience
    Daniele Marin
    Department of Radiology, Duke University Medical Center, Erwin Road, Durham, NC, 27710, USA
    Radiology 254:145-53. 2010
    ....
  33. doi request reprint Three-dimensional simulation of lung nodules for paediatric multidetector array CT
    X Li
    Department of Radiology, Duke University, Durham, NC 27705, USA
    Br J Radiol 82:401-11. 2009
    ..In conclusion, mathematical simulation is a feasible technique for creating realistic small lung nodules on paediatric MDCT images...
  34. ncbi request reprint Simulation study of a quasi-monochromatic beam for x-ray computed mammotomography
    Randolph L McKinley
    Department of Radiology, Duke University Medical Center, Durham, North Carolina 27710, USA
    Med Phys 31:800-13. 2004
    ..Simulations demonstrate that this quasi-monochromatic x-ray technique may enhance tissue separation for a newly developed cone beam computed mammotomography application for an uncompressed breast...
  35. ncbi request reprint Imaging properties of digital magnification radiography
    Sarah J Boyce
    Duke Advanced Imaging Laboratories, Department of Radiology, Duke University, Durham, North Carolina 27708, USA
    Med Phys 33:984-96. 2006
    ..5 times for general radiography (and mammotomography). These results indicate that the optimal geometry can improve image quality without changing patient dose or otherwise reduce dose without compromising image quality...
  36. doi request reprint A set of 4D pediatric XCAT reference phantoms for multimodality research
    Hannah Norris
    Carl E Ravin Advanced Imaging Laboratories, Department of Radiology, Duke University Medical Center, Durham, North Carolina 27705
    Med Phys 41:033701. 2014
    ..These models will serve as the foundation from which the authors will create a vast population of pediatric phantoms for optimizing pediatric CT imaging protocols...
  37. ncbi request reprint Evaluation of a quality control phantom for digital chest radiography
    E Mah
    Department of Radiology, Medical University of South Carolina, Charleston, South Carolina 29425, USA
    J Appl Clin Med Phys 2:90-101. 2001
    ..This makes the implementation of a uniform QC program easier for institutions with a mixture of different digital radiography systems...
  38. ncbi request reprint Comparison of edge analysis techniques for the determination of the MTF of digital radiographic systems
    Ehsan Samei
    Duke Advanced Imaging Laboratories, Departments of Radiology, Biomedical Engineering, and Physics, Duke University, DUMC 3302, Durham, NC 27710, USA
    Phys Med Biol 50:3613-25. 2005
    ..The agreement of the MTF results was judged sufficient for the measurement of the MTF necessary for the determination of the DQE...
  39. ncbi request reprint Multiprojection correlation imaging for improved detection of pulmonary nodules
    Ehsan Samei
    Duke Advanced Imaging Laboratories, Department of Radiology, Duke University Medical Center, 2424 Erwin Rd, Suite 302, Durham, NC 27705, USA
    AJR Am J Roentgenol 188:1239-45. 2007
    ....
  40. ncbi request reprint Digital mammography image quality: image display
    Eliot Siegel
    University of Maryland, Department of Radiology, Baltimore, MD, USA
    J Am Coll Radiol 3:615-27. 2006
    ....
  41. doi request reprint Hypervascular liver tumors: low tube voltage, high tube current multidetector CT during late hepatic arterial phase for detection--initial clinical experience
    Daniele Marin
    Department of Radiology, Duke University Medical Center, Durham, NC, USA
    Radiology 251:771-9. 2009
    ....
  42. ncbi request reprint Object detectability at increased ambient lighting conditions
    Benjamin J Pollard
    Duke Advanced Imaging Laboratories, Department of Radiology, Medical Physics Graduate Program, Duke University, Durham, North Carolina 27705, USA
    Med Phys 35:2204-13. 2008
    ..Findings from the second study provide psychophysical evidence that ambient lighting may be increased to a level within this range, potentially improving radiologist comfort, without deleterious effects on diagnostic performance...
  43. pmc Automated breast mass detection in 3D reconstructed tomosynthesis volumes: a featureless approach
    Swatee Singh
    Department of Radiology, Duke University Medical Center, Durham, North Carolina 27705, USA
    Med Phys 35:3626-36. 2008
    ..The best overall system performance was 85% sensitivity with 2.4 FPs per breast volume for scheme A, 3.6 FPs per breast volume for scheme B, and 3 FPs per breast volume for scheme C...
  44. pmc A technique optimization protocol and the potential for dose reduction in digital mammography
    Nicole T Ranger
    Department of Radiology, Carl E Ravin Advanced Imaging Laboratories, Duke University, Durham, North Carolina 27710, USA
    Med Phys 37:962-9. 2010
    ....
  45. pmc Towards optimized acquisition scheme for multiprojection correlation imaging of breast cancer
    Amarpreet S Chawla
    Department of Radiology, Duke Advanced Imaging Laboratories, Duke University, Durham, NC 27705, USA
    Acad Radiol 16:456-63. 2009
    ..The authors describe a computer-aided detection (CADe) methodology to optimize the acquisition scheme of CI for superior diagnostic accuracy...
  46. doi request reprint Pediatric MDCT: towards assessing the diagnostic influence of dose reduction on the detection of small lung nodules
    Xiang Li
    Medical Physics Graduate Program, Department of Radiology, Duke University, 2424 Erwin Road, Suite 302, Durham, NC 27705, USA
    Acad Radiol 16:872-80. 2009
    ..The purpose of this study was to evaluate the effect of reduced tube current (dose) on lung nodule detection in pediatric multidetector array computed tomography (MDCT)...
  47. ncbi request reprint Quantitative imaging in breast tomosynthesis and CT: comparison of detection and estimation task performance
    Samuel Richard
    Department of Radiology, Carl E Ravin Advanced Imaging Laboratories, Duke University, Durham, North Carolina 27705, USA
    Med Phys 37:2627-37. 2010
    ..This work investigates a framework for modeling volumetric breast imaging to compare detection and estimation task performance and optimize quantitative breast imaging...
  48. pmc Optimized image acquisition for breast tomosynthesis in projection and reconstruction space
    Amarpreet S Chawla
    Department of Radiology, Duke Advanced Imaging Laboratories, Duke University, Durham, North Carolina 27705, USA
    Med Phys 36:4859-69. 2009
    ..The optimization framework developed in this framework is applicable to other reconstruction techniques and other multiprojection systems...
  49. pmc The quantitative potential for breast tomosynthesis imaging
    Christina M Shafer
    Department of Radiology, Carl E Ravin Advanced Imaging Laboratories, Duke University Medical Center, Durham, North Carolina 27705, USA
    Med Phys 37:1004-16. 2010
    ..This quantitation could allow improved characterization of lesions as well as image processing to present tomosynthesis images with the familiar appearance of mammography by preserving more low-frequency information...
  50. ncbi request reprint Quantitative breast tomosynthesis: from detectability to estimability
    Samuel Richard
    Department of Radiology, Carl E Ravin Laboratories, Duke University, 2424 Erwin Road, Suite 302, Durham, North Carolina 27705, USA
    Med Phys 37:6157-65. 2010
    ..The new methodology was applied to the platform of breast tomosynthesis for investigating the influence of acquisition parameters (e.g., acquisition angle and dose) on quantitative imaging performance...
  51. pmc A mathematical model platform for optimizing a multiprojection breast imaging system
    Amarpreet S Chawla
    Duke Advanced Imaging Laboratories, Department of Radiology, Duke University, Durham, North Carolina 27705, USA
    Med Phys 35:1337-45. 2008
    ..The optimization scheme presented here may be applied to any multiprojection imaging modalities and may be extended by including reconstruction in the case of digital breast tomosynthesis and breast computed tomography...
  52. ncbi request reprint Comparison of LCD and CRT displays based on efficacy for digital mammography
    Robert S Saunders
    Duke Advanced Imaging Laboratories, Departments of Radiology and Physics, 2424 Erwin Road, Suite 302, Duke University, Durham, NC 27705, USA
    Acad Radiol 13:1317-26. 2006
    ..To compare two display technologies, cathode ray tube (CRT) and liquid crystal display (LCD), in terms of diagnostic accuracy for several common clinical tasks in digital mammography...
  53. ncbi request reprint Viewing angle performance of medical liquid crystal displays
    Ehsan Samei
    Duke Advanced Imaging Laboratories, Department of Radiology, Duke University, Durham, North Carolina 27710, USA
    Med Phys 33:645-54. 2006
    ..3 and beta175 quantities for defining the viewing angle cones within which a medical LCD device can be effectively utilized...
  54. ncbi request reprint Simulation of mammographic lesions
    Robert Saunders
    Department of Radiology, Duke Advanced Imaging Laboratories, Duke University, 2424 Erwin Rd, Suite 302, Durham, NC 27705, USA
    Acad Radiol 13:860-70. 2006
    ..This simulation method allows for the creation of large image datasets with particular lesions, which may serve as a useful tool for perception studies measuring imaging system performance...
  55. ncbi request reprint A method for modifying the image quality parameters of digital radiographic images
    Robert S Saunders
    Department of Radiology and Physics, Duke University, Durham, North Carolina 27710, USA
    Med Phys 30:3006-17. 2003
    ..The findings indicate that the developed modification routines provide a good means of simulating the resolution and noise characteristics of digital radiographic systems for optimization or processing purposes...
  56. ncbi request reprint Ambient illumination revisited: a new adaptation-based approach for optimizing medical imaging reading environments
    Amarpreet S Chawla
    Duke Advanced Imaging Laboratories, Departments of Radiology and Biomedical Engineering, Duke University, Durham, North Carolina 27705, USA
    Med Phys 34:81-90. 2007
    ..13-0.22 sr(-1) provide an ideal setup for typical LCDs. Future LCDs with lower diffuse reflectivity and with higher inherent luminance ratios can provide further improvement of ergonomic viewing conditions in reading rooms...
  57. ncbi request reprint Intercomparison of methods for image quality characterization. II. Noise power spectrum
    James T Dobbins
    Duke Advanced Imaging Laboratories, Department of Radiology, Duke University, Durham, North Carolina 27710, USA
    Med Phys 33:1466-75. 2006
    ..1% relative difference in NPS averaged over frequency, for each factor considered separately). Overall, the three methods agreed to within 1.6% +/- 0.8% when averaged over frequencies > 0.15 mm(-1)...
  58. ncbi request reprint Digital mammography: effects of reduced radiation dose on diagnostic performance
    Ehsan Samei
    Duke Advanced Imaging Laboratories, Department of Radiology, Duke University Medical Center, 2424 Erwin Rd, Suite 302, Durham, NC 27705, USA
    Radiology 243:396-404. 2007
    ..To experimentally determine the relationship between radiation dose and observer accuracy in the detection and discrimination of simulated lesions for digital mammography...
  59. ncbi request reprint Resolution and noise measurements of five CRT and LCD medical displays
    Robert S Saunders
    Duke Advanced Imaging Laboratories, Department of Radiology, Duke University Medical Center, Durham, North Carolina 27710, USA
    Med Phys 33:308-19. 2006
    ..01% (accounting for blurring only) and 0.40 +/- 0.01% (accounting for blurring and prewhitening) for CRTs, and 1.02% +/- 0.22% (accounting for blurring only) and 0.36% +/- 0.08% (accounting for blurring and prewhitening) for LCDs...
  60. ncbi request reprint Chest radiography: optimization of X-ray spectrum for cesium iodide-amorphous silicon flat-panel detector
    James T Dobbins
    Department of Radiology, Duke University Medical Center, 161F Bryan Research Bldg, Research Drive, DUMC Box 3302, Durham, NC 27710, USA
    Radiology 226:221-30. 2003
    ..To ascertain the optimum x-ray spectrum for chest radiography with a cesium iodide-amorphous silicon flat-panel detector...
  61. ncbi request reprint Impact of resolution and noise characteristics of digital radiographic detectors on the detectability of lung nodules
    Robert S Saunders
    Department of Physics, Duke University, Durham, North Carolina 27710, USA
    Med Phys 31:1603-13. 2004
    ....
  62. pmc Assessment of detective quantum efficiency: intercomparison of a recently introduced international standard with prior methods
    Nicole T Ranger
    Duke Advanced Imaging Laboratories, Department of Radiology, Duke University and Medical Center, 2424 Erwin Rd, Suite 302, Durham, NC 27705, USA
    Radiology 243:785-95. 2007
    ..To prospectively evaluate the recently introduced international standard method for measurement of the detective quantum efficiency (DQE) of digital radiography systems, in comparison with representative prior methods...
  63. pmc Tomographic digital subtraction angiography for lung perfusion estimation in rodents
    Cristian T Badea
    Center for In Vivo Microscopy, Box 3302, Duke University Medical Center, Durham, North Carolina 27710, USA
    Med Phys 34:1546-55. 2007
    ..TDSA imaging has potential application in a number of areas where functional perfusion measurements in 4D can provide valuable insight into animal models of disease and response to therapeutics...
  64. ncbi request reprint Recent advances in chest radiography
    H Page McAdams
    Department of Radiology, Duke Advanced Imaging Laboratories, Duke University Medical Center, Box 3808, Durham, NC 27710, USA
    Radiology 241:663-83. 2006
    ..The ultimate influence of these new technologies will, of course, depend on the outcome of rigorous scientific validation...
  65. doi request reprint Detection of pancreatic tumors, image quality, and radiation dose during the pancreatic parenchymal phase: effect of a low-tube-voltage, high-tube-current CT technique--preliminary results
    Daniele Marin
    Department of Radiology, Duke University Medical Center, Erwin Rd, Durham, NC 27710, USA
    Radiology 256:450-9. 2010
    ....
  66. ncbi request reprint Comparison of patient size-based methods for estimating quantum noise in CT images of the lung
    Xiang Li
    Medical Physics Graduate Program, Duke Advanced Imaging Laboratories, Department of Radiology, Duke University Medical Center, Durham, North Carolina 27705, USA
    Med Phys 36:541-6. 2009
    ..Considering the magnitude of noise variation across the lung volume (approximately 30%), noise estimate based on non-lung area was reasonably accurate...
  67. ncbi request reprint Optimized radiographic spectra for small animal digital subtraction angiography
    Ming De Lin
    Center for In Vivo Microscopy, Box 3302, Duke University Medical Center, Durham, North Carolina 27710, USA
    Med Phys 33:4249-57. 2006
    ..A reasonable tradeoff can be achieved at tube potentials at the beginning of the performance plateau, around 70 kVp, where the relative gain in SdNR2 is the greatest...
  68. pmc Optimization of exposure parameters in full field digital mammography
    Mark B Williams
    Department of Radiology, University of Virginia, Charlottesville, Virginia 22908, USA
    Med Phys 35:2414-23. 2008
    ..In most cases, the AECs of the FFDM systems successfully identified exposure parameters resulting in FOM values near the maximum ones, however, there were several examples where AEC performance could be improved...
  69. ncbi request reprint The effect of breast compression on mass conspicuity in digital mammography
    Robert S Saunders
    Duke Advanced Imaging Laboratories, Department of Radiology, Duke University Medical Center, Durham, North Carolina 27705, USA
    Med Phys 35:4464-73. 2008
    ....
  70. pmc Detector or system? Extending the concept of detective quantum efficiency to characterize the performance of digital radiographic imaging systems
    Ehsan Samei
    Duke Advanced Imaging Laboratories, Department of Radiology, Duke University and Medical Center, 2424 Erwin Rd, Suite 302, Durham, NC 27705, USA
    Radiology 249:926-37. 2008
    ..To develop an experimental method for measuring the effective detective quantum efficiency (eDQE) of digital radiographic imaging systems and evaluate its use in select imaging systems...
  71. pmc Population of anatomically variable 4D XCAT adult phantoms for imaging research and optimization
    W P Segars
    Carl E Ravin Advanced Imaging Laboratories, Department of Radiology, The Duke University Medical Center, Durham, North Carolina 27705, USA
    Med Phys 40:043701. 2013
    ..In this work, the authors extend the XCAT beyond these reference anatomies by developing a series of anatomically variable 4D XCAT adult phantoms for imaging research, the first library of 4D computational phantoms...
  72. ncbi request reprint TH-E-217BCD-07: Quantitative Comparison of Noise Texture Across CT Scanners from Different Vendors
    J Solomon
    Duke University Medical Center, Durham, NC
    Med Phys 39:4016. 2012
    ..Conclusions: It is possible to use the NPS to quantitatively compare noise texture across CT systems. The degree to which similar texture across scanners could be achieved varies and is limited by the kernels available on each scanner...
  73. ncbi request reprint TH-E-217BCD-02: Defining Performance-Based, Size-Specific, Optimized Protocols for Pediatric CT
    X Li
    Duke University Medical Center, Durham, NC
    Med Phys 39:4014-5. 2012
    ..By accounting for the risk difference between age groups, the concept of risk index has innovative applications in pediatric protocol optimization...
  74. ncbi request reprint Improving mammographic decision accuracy by incorporating observer ratings with interpretation time
    R S Saunders
    Duke Advanced Imaging Laboratories, Department of Radiology, 2424 Erwin Road, Suite 302, Duke University Medical Center, Durham, NC 27705, USA
    Br J Radiol 79:S117-22. 2006
    ..This suggests that interpretation time can be incorporated into mammographic decision-making in order to identify cases with higher probabilities of perceptual error that require further review...
  75. ncbi request reprint Intercomparison of methods for image quality characterization. I. Modulation transfer function
    Ehsan Samei
    Duke Advanced Imaging Laboratories, Department of Radiology, Duke University, Durham, North Carolina 27710, USA
    Med Phys 33:1454-65. 2006
    ..Careful attention to influencing factors is warranted to achieve accurate results...
  76. ncbi request reprint Simulation of liver lesions for pediatric CT
    Chee L Hoe
    Duke Advanced Imaging Laboratories, Department of Radiology, Duke University Medical Center, Box 3302, Durham, NC 27710, USA
    Radiology 238:699-705. 2006
    ..To develop and validate a technique based on characteristics of real lesions for simulating realistic small liver lesions on pediatric computed tomographic (CT) images...
  77. ncbi request reprint Kilovoltage cone-beam CT: comparative dose and image quality evaluations in partial and full-angle scan protocols
    Sangroh Kim
    Medical Physics Graduate Program, Duke University Medical Center, Durham, North Carolina 27710, USA
    Med Phys 37:3648-59. 2010
    ..To assess imaging dose of partial and full-angle kilovoltage CBCT scan protocols and to evaluate image quality for each protocol...
  78. ncbi request reprint WE-A-218-08: Comparison of Automated Methods to Measure Patient Size for Dose- Monitoring in Computed Tomography
    O Christianson
    Durham, NC
    Med Phys 39:3940. 2012
    ..Conclusions: All three methods accurately calculated SSDE to within 5%. Method A, which uses a thresholded scout image, offers the simplest and most computationally efficient approach to measure patient size for dose monitoring purposes...
  79. ncbi request reprint TH-E-217BCD-04: MA Modulation and Iterative Reconstruction: Evaluation Using a New CT Phantom
    Jm Wilson
    Duke University Medical Center, Durham, NC
    Med Phys 39:4015. 2012
    ..Ehsan Samei Research grant: NIH R01 EB001838; Research grant: General Electric; Research grant: Siemens Medical; Research grant: Carestream Health; Share-holder: Zumatek Inc; Advisory Board: IBA...
  80. ncbi request reprint TU-F-217A-01: Informatics 2: Dose Monitoring
    T Cook
    Duke University Medical Center, Durham, NC
    Med Phys 39:3917. 2012
    ..To discuss the advanced concepts currently under investigation (eg, patient size tracking)4. To demonstrate how dose monitoring systems can be used for improved quality initiatives...
  81. ncbi request reprint SU-E-I-47: Comparison of Risks for Two Medical Imaging Procedures
    K Roy Choudhury
    Duke University Medical Center, Durham, NC
    Med Phys 39:3635. 2012
    ..At higher ages, the relative risk is approximately equal. Conclusions: Relative risks can quantify risks comparisons between imaging procedures...
  82. ncbi request reprint SU-D-217A-03: Nuclear Medicine Uniformity Assessment Using 2D Noise Power Spectrum
    J Nelson
    Duke University Medical Center, Durham, NC
    Med Phys 39:3621. 2012
    ..Using this new metric in conjunction with the traditional pixel value-based assessment will allow a more accurate quantitative assessment of nuclear medicineuniformity...
  83. ncbi request reprint TH-E-217BCD-09: Task-Based Image Quality of CT Iterative Reconstruction Across Three Commercial Implementations
    E Samei
    Duke University Medical Center, Durham, NC
    Med Phys 39:4016. 2012
    ..The percent dose reduction achievable while maintaining image quality, however, varied across scanner models. This data provides a new perspective to define and optimize CT protocols across commercial scanner models...
  84. ncbi request reprint Hypervascular liver tumors: low tube voltage, high tube current multi-detector row CT for enhanced detection--phantom study
    Sebastian T Schindera
    Department of Radiology, Duke University Medical Center, Box 3808, Erwin Rd, Durham, NC 27710, USA
    Radiology 246:125-32. 2008
    ....
  85. pmc Generalized "satisfaction of search": adverse influences on dual-target search accuracy
    Mathias S Fleck
    Department of Psychology and Neuroscience, Center for Cognitive Neuroscience, Duke University, Durham, NC 27708, USA
    J Exp Psychol Appl 16:60-71. 2010
    ..In an example like airport luggage screening, the current data suggest that the detection of an easy-to-spot target (e.g., a water bottle) might reduce detection of a hard-to-spot target (e.g., a box cutter)...
  86. ncbi request reprint Contrast-detail analysis of three flat panel detectors for digital radiography
    Giovanni Borasi
    Servizio di Fisica Sanitaria, Azienda Ospedaliera Santa Maria Nuova, V le Risorgimento 80, 42100 Reggio Emilia RE, Italy
    Med Phys 33:1707-19. 2006
    ..Theoretical analyses based on the Perception Statistical Model gave similar predicted SNRT values corresponding to an observer efficiency of about 0.08 for systems A and B and 0.05 for system C...
  87. ncbi request reprint Determination of the detective quantum efficiency of a digital x-ray detector: comparison of three evaluations using a common image data set
    Ulrich Neitzel
    Philips Medical Systems, Röntgenstrasse 24, D 22335 Hamburg, Germany
    Med Phys 31:2205-11. 2004
    ..It is expected that the recently published standard on DQE determination will further reduce variations in the data evaluation and thus in the results of DQE measurements...
  88. ncbi request reprint Assessment of flat panel LCD primary class display performance based on AAPM TG 18 acceptance protocol
    Haijo Jung
    BK21 Project for Medical Sciences, Department of Radiology, Research Institute of Radiological Science, Yonsei University College of Medicine, Seoul, Korea
    Med Phys 31:2155-64. 2004
    ....
  89. pmc Dose dependence of mass and microcalcification detection in digital mammography: free response human observer studies
    Mark Ruschin
    Department of Medical Radiation Physics, Lund University, Malmo University Hospital, SE 205 02, Malmo, Sweden
    Med Phys 34:400-7. 2007
    ..84, p < 0.0001). The results indicate that lowering the present dose level by a factor of two compromised the detection of microcalcifications but had a weaker effect on mass detection...
  90. pmc Visual assessment of angular response in medical liquid crystal displays
    Aldo Badano
    Center for Devices and Radiological Health, U S Food and Drug Administration, 12720 Twinbrook Parkway, Rockville, MD 20857, USA
    J Digit Imaging 19:240-8. 2006
    ..We found that this procedure offers the end user of displays a simple, fast, and relatively consistent technique to verify that the viewing angle performance of the display device is within certain acceptable limits...
  91. ncbi request reprint Sonography of fetal choroid plexus cysts: detection depends on cyst size and gestational age
    Shannon R Turner
    Department of Radiology, Duke University Medical Center, Durham, North Carolina, USA
    J Ultrasound Med 22:1219-27. 2003
    ..To establish diagnostic criteria for the diagnosis of fetal choroid plexus cysts across gestation...

Research Grants6

  1. Early Detection of Lung Cancer via Bi Plane Correlation
    Ehsan Samei; Fiscal Year: 2002
    ..The findings will be used to demonstrate the capability of the approach for improving the detection of lung nodules, and thus the prognosis of lung cancer. ..
  2. Bi-Plane Correlation Imaging: Detection of Lung Cancer
    Ehsan Samei; Fiscal Year: 2007
    ..The findings will be used to substantiate the capability of BCI for improving the early detection of lung nodules and to optimize its performance on actual clinical cases. ..
  3. Resolution requirements for mammographic displays
    Ehsan Samei; Fiscal Year: 2004
    ..The results will be used to formulate recommendations to the breast imaging community concerning display resolution criteria for safe and optimized soft-copy display of digital mammograms. ..