R Fahrig

Summary

Affiliation: Stanford University
Country: USA

Publications

  1. ncbi request reprint Scatter correction method for X-ray CT using primary modulation: theory and preliminary results
    Lei Zhu
    Department of Electrical Engineering, Stanford University, Stanford, CA 94305, USA
    IEEE Trans Med Imaging 25:1573-87. 2006
  2. ncbi request reprint Performance of a static-anode/flat-panel x-ray fluoroscopy system in a diagnostic strength magnetic field: a truly hybrid x-ray/MR imaging system
    R Fahrig
    Department of Radiology, Stanford University, Stanford, California 94305, USA
    Med Phys 32:1775-84. 2005
  3. ncbi request reprint First use of a truly-hybrid X-ray/MR imaging system for guidance of brain biopsy
    R Fahrig
    Department of Radiology, Stanford University, California 94305, USA
    Acta Neurochir (Wien) 145:995-7; discussion 997. 2003
  4. ncbi request reprint A truly hybrid interventional MR/X-ray system: feasibility demonstration
    R Fahrig
    Department of Radiology, Stanford University, Stanford, California 94305 5488, USA
    J Magn Reson Imaging 13:294-300. 2001
  5. ncbi request reprint A three-dimensional reconstruction algorithm for an inverse-geometry volumetric CT system
    Taly Gilat Schmidt
    Department of Radiology, Stanford University, Stanford, California 94305, USA
    Med Phys 32:3234-45. 2005
  6. ncbi request reprint An inverse-geometry volumetric CT system with a large-area scanned source: a feasibility study
    Taly Gilat Schmidt
    Department of Radiology, Stanford University, Stanford, California 94305, USA
    Med Phys 31:2623-7. 2004
  7. ncbi request reprint A short-scan reconstruction for cone-beam CT using shift-invariant FBP and equal weighting
    Lei Zhu
    Electrical Engineering and Radiology, Stanford University, Stanford, California 94305, USA
    Med Phys 34:4422-38. 2007
  8. ncbi request reprint Study of increased radiation when an x-ray tube is placed in a strong magnetic field
    Zhifei Wen
    Department of Radiology, Stanford University, Stanford, California 94305, USA
    Med Phys 34:408-18. 2007
  9. ncbi request reprint Investigation of electron trajectories of an x-ray tube in magnetic fields of MR scanners
    Zhifei Wen
    Department of Radiology, Stanford University, Stanford, California 94305, USA
    Med Phys 34:2048-58. 2007
  10. doi request reprint Simulations of virtual PET/CT 3-D bronchoscopy imaging using a physical porcine lung-heart phantom
    David Yerushalmi
    Department of Bioengineering, Stanford University, The James H Clark Center, 318 Campus Drive, E150, Stanford, CA 94305, USA
    Mol Imaging Biol 11:275-82. 2009

Research Grants

  1. C-Arm CT for Guidence of Cardiac Interventions
    Rebecca Fahrig; Fiscal Year: 2010
  2. Dual kV/MV Imaging for Metal Artifact Reduction
    JOSH MORRIS STAR LACK; Fiscal Year: 2010
  3. MR-Compatible X-Ray Tube
    Rebecca Fahrig; Fiscal Year: 2010
  4. MR-Compatible X-Ray Tube
    Rebecca Fahrig; Fiscal Year: 2009
  5. Efficient Scatter Correction
    Rebecca Fahrig; Fiscal Year: 2007
  6. Improved C-Arm CT for Interventional Procedures
    Rebecca Fahrig; Fiscal Year: 2006
  7. Hybrid X-Ray/MR Systems for Image-Guided Procedures
    Rebecca Fahrig; Fiscal Year: 2004
  8. MR-Compatible X-Ray Tube
    Rebecca Fahrig; Fiscal Year: 2009

Collaborators

Detail Information

Publications44

  1. ncbi request reprint Scatter correction method for X-ray CT using primary modulation: theory and preliminary results
    Lei Zhu
    Department of Electrical Engineering, Stanford University, Stanford, CA 94305, USA
    IEEE Trans Med Imaging 25:1573-87. 2006
    ..Although the proposed scatter correction technique was implemented for X-ray CT, it can also be used in other X-ray imaging applications, as long as a primary modulator can be inserted between the X-ray source and the imaged object...
  2. ncbi request reprint Performance of a static-anode/flat-panel x-ray fluoroscopy system in a diagnostic strength magnetic field: a truly hybrid x-ray/MR imaging system
    R Fahrig
    Department of Radiology, Stanford University, Stanford, California 94305, USA
    Med Phys 32:1775-84. 2005
    ..We have also concluded that a-Si electronics are robust against magnetic fields. Detailed knowledge of the x-ray system installation is required to provide estimates of system operation...
  3. ncbi request reprint First use of a truly-hybrid X-ray/MR imaging system for guidance of brain biopsy
    R Fahrig
    Department of Radiology, Stanford University, California 94305, USA
    Acta Neurochir (Wien) 145:995-7; discussion 997. 2003
    ..The system could be particularly effective for guidance of those cases where motion, swelling, resection and other intra-operative anatomical changes cannot be accounted for using traditional stereotactic-based imaging approaches...
  4. ncbi request reprint A truly hybrid interventional MR/X-ray system: feasibility demonstration
    R Fahrig
    Department of Radiology, Stanford University, Stanford, California 94305 5488, USA
    J Magn Reson Imaging 13:294-300. 2001
    ..Further work is required to ensure that the highest possible image quality is achieved with both MR and x-ray modalities...
  5. ncbi request reprint A three-dimensional reconstruction algorithm for an inverse-geometry volumetric CT system
    Taly Gilat Schmidt
    Department of Radiology, Stanford University, Stanford, California 94305, USA
    Med Phys 32:3234-45. 2005
    ..4 mm isotropic resolution. The successful implementation of the reconstruction algorithm is an important step in establishing feasibility of the IGCT system...
  6. ncbi request reprint An inverse-geometry volumetric CT system with a large-area scanned source: a feasibility study
    Taly Gilat Schmidt
    Department of Radiology, Stanford University, Stanford, California 94305, USA
    Med Phys 31:2623-7. 2004
    ..5 s and, when compared to a conventional scanner operating at 24 kW with a 0.5-s voxel illumination time (e.g., 0.5-s gantry rotation and pitch of one), predicted a relative SNR of 76%...
  7. ncbi request reprint A short-scan reconstruction for cone-beam CT using shift-invariant FBP and equal weighting
    Lei Zhu
    Electrical Engineering and Radiology, Stanford University, Stanford, California 94305, USA
    Med Phys 34:4422-38. 2007
    ..Due to its shift-invariant filtered-backprojection structure, the proposed algorithm is implemented efficiently, and requires a simple adaptation of the FDK algorithm...
  8. ncbi request reprint Study of increased radiation when an x-ray tube is placed in a strong magnetic field
    Zhifei Wen
    Department of Radiology, Stanford University, Stanford, California 94305, USA
    Med Phys 34:408-18. 2007
    ..Good agreement was observed between experimental data and simulation results. The wide spatial distribution of secondary x-ray emission can degrade the MTF of the x-ray system at low spatial frequencies for B < 0.5 T...
  9. ncbi request reprint Investigation of electron trajectories of an x-ray tube in magnetic fields of MR scanners
    Zhifei Wen
    Department of Radiology, Stanford University, Stanford, California 94305, USA
    Med Phys 34:2048-58. 2007
    ..In a weak magnetic field (B < or = E/c), the main deflection is in the E x B direction and is caused by the perpendicular component of the magnetic field...
  10. doi request reprint Simulations of virtual PET/CT 3-D bronchoscopy imaging using a physical porcine lung-heart phantom
    David Yerushalmi
    Department of Bioengineering, Stanford University, The James H Clark Center, 318 Campus Drive, E150, Stanford, CA 94305, USA
    Mol Imaging Biol 11:275-82. 2009
    ....
  11. doi request reprint A hybrid radiography/MRI system for combining hysterosalpingography and MRI in infertility patients: initial experience
    Cynthia B Freeman-Walsh
    Department of Radiology, Stanford Hospital, Stanford, CA, USA
    AJR Am J Roentgenol 190:W157-60. 2008
    ..Pelvic MRI was followed by hysterosalpingography (HSG) without moving the patient. This system allowed evaluation of tubal patency and cross-sectional imaging with one examination...
  12. ncbi request reprint Dose and image quality for a cone-beam C-arm CT system
    Rebecca Fahrig
    Radiology, Stanford University, Lucas MRS Imaging Center 1201 Welch Rd, Rm P 286, Palo Alto, California 94305, USA
    Med Phys 33:4541-50. 2006
    ..The relationships between kVp, image noise, dose, and contrast perception are discussed...
  13. ncbi request reprint Truly hybrid interventional MR/X-ray system: investigation of in vivo applications
    R Fahrig
    Department of Radiology, Stanford University, Calif 94305, USA
    Acad Radiol 8:1200-7. 2001
    ..The integrated nature of the system could be especially beneficial when x-ray and MR image guidance are used iteratively...
  14. ncbi request reprint Filtered backprojection for modifying the impulse response of circular tomosynthesis
    G M Stevens
    Department of Radiology, Stanford University, California 94305, USA
    Med Phys 28:372-80. 2001
    ..This filtering may be desirable because the blurred out-of-plane objects appear less structured...
  15. ncbi request reprint Co-registration of x-ray and MR fields of view in a hybrid XMR system
    Huanzhou Yu
    Department of Electrical Engineering, Lucas MRS Imaging Center, Stanford University, 1201 Welch Road, Rm P064, Stanford, CA 94305, USA
    J Magn Reson Imaging 22:291-301. 2005
    ..To validate one possible function of a real-time x-ray/MR (XMR) interface in a hybrid XMR system using x-ray images as "scouts" to prescribe the MR slices...
  16. ncbi request reprint Optimization of a tomosynthesis system for the detection of lung nodules
    Angel R Pineda
    Department of Radiology, Stanford University, Stanford, California 94305, USA
    Med Phys 33:1372-9. 2006
    ..The validation of these mathematical observers extends their applicability to the optimization of tomosynthesis systems...
  17. doi request reprint Time-resolved three-dimensional imaging of the left atrium and pulmonary veins in the interventional suite--a comparison between multisweep gated rotational three-dimensional reconstructed fluoroscopy and multislice computed tomography
    Amin Al-Ahmad
    Cardiac Arrhythmia Service, Stanford University Medical School, Stanford, California, USA
    Heart Rhythm 5:513-9. 2008
    ..We have developed a new imaging technique that allows acquisition and visualization of three-dimensional (3D) cardiac images in the catheter lab...
  18. pmc Characterization of a novel anthropomorphic plastinated lung phantom
    Sungwon Yoon
    Department of Electrical Engineering, Stanford University, Stanford, California 94305, USA
    Med Phys 35:5934-43. 2008
    ..A second generation phantom, which eliminates most of the by-products, is presented. Such anthropomorphic phantoms can be used to evaluate a wide range of novel imaging systems...
  19. doi request reprint MR voiding cystography for evaluation of vesicoureteral reflux
    Shreyas S Vasanawala
    Department of Radiology, Lucile Packard Children s Hospital and Stanford University, 725 Welch Road, Stanford, CA 94305 5654, USA
    AJR Am J Roentgenol 192:W206-11. 2009
    ..CONCLUSION: MR voiding cystography with a real-time interactive MR fluoroscopic technique on an open MRI magnet is feasible for the evaluation of VUR in children...
  20. pmc Scatter correction method for x-ray CT using primary modulation: phantom studies
    Hewei Gao
    Department of Radiology, Stanford University, Stanford, California 94305, USA
    Med Phys 37:934-46. 2010
    ..In this work, the authors provide a quantitative evaluation of the primary modulation technique and demonstrate its performance in applications where scatter correction is more challenging...
  21. pmc Dose and detectability for a cone-beam C-arm CT system revisited
    Arundhuti Ganguly
    Department of Radiology, Lucas MRS Center, Stanford University, 1201 Welch Road, Palo Alto, California 94305, USA
    Med Phys 37:2264-8. 2010
    ..A more detailed analysis based on recent theoretical modeling of C-arm CT images is presented in this work...
  22. pmc Simultaneous segmentation and reconstruction: a level set method approach for limited view computed tomography
    Sungwon Yoon
    Department of Radiology, Stanford University, Stanford, California 94305, USA
    Med Phys 37:2329-40. 2010
    ..An iterative tomographic reconstruction algorithm that simultaneously segments and reconstructs the reconstruction domain is proposed and applied to tomographic reconstructions from a sparse number of projection images...
  23. pmc Modulator design for x-ray scatter correction using primary modulation: material selection
    Hewei Gao
    Department of Radiology, Stanford University, California 94305, USA
    Med Phys 37:4029-37. 2010
    ..In the practical implementation, beam hardening of the modulator blocker is a limiting factor because it causes inconsistency in the primary signal and therefore degrades the accuracy of scatter correction...
  24. doi request reprint In-vitro imaging of femoral artery nitinol stents for deformation analysis
    Arundhuti Ganguly
    Department of Radiology, Stanford University, 1201 Welch Rd, Palo Alto, CA 94305, USA
    J Vasc Interv Radiol 22:236-43. 2011
    ..The present study sought to develop a method of imaging and analyzing stent deformation in vitro with use of a calibrated test device...
  25. doi request reprint In-vivo imaging of femoral artery nitinol stents for deformation analysis
    Arundhuti Ganguly
    Department of Radiology, Stanford University, 1201 Welch Rd, Palo Alto, CA 94305, USA
    J Vasc Interv Radiol 22:244-9. 2011
    ..In this pilot study, forces on stents were evaluated under different in-vivo flexion conditions...
  26. ncbi request reprint Quantitative evaluation of the relaxivity effects of iodine on GD-DTPA enhanced MR arthrography
    Arundhuti Ganguly
    Lucas MRS Center, Department of Radiology, Stanford University, 1201 Welch Road, Stanford, CA 94305, USA
    J Magn Reson Imaging 25:1219-25. 2007
    ..To quantify the effect of iodine on the gadolinium (Gd) contrast-enhanced signal in MR arthrography...
  27. ncbi request reprint Determination of 3-dimensional zonal renal volumes using contrast-enhanced computed tomography
    Graham Sommer
    Department of Radiology, Stanford University School of Medicine, Stanford, CA 94305 5105, USA
    J Comput Assist Tomogr 31:209-13. 2007
    ..To determine the accuracy with which total and cortical renal volumes may be measured in vivo with contrast-enhanced computed tomography (CT) in an animal model...
  28. ncbi request reprint Truly hybrid X-ray/MR imaging: toward a streamlined clinical system
    Arundhuti Ganguly
    Department of Radiology, Stanford University, Lucas MRS Center, 1201 Pasteur Dr, Stanford, CA 94305, USA
    Acad Radiol 12:1167-77. 2005
    ..5T GE Signa-SP magnet (SP-XMR). This paper describes the methods for increased compatibility between the upgraded x-ray and MR systems that have helped improve patient management...
  29. ncbi request reprint MR-guided transjugular intrahepatic portosystemic shunt creation with use of a hybrid radiography/MR system
    Stephen T Kee
    Department of Radiology, Stanford University, California 94305, USA
    J Vasc Interv Radiol 16:227-34. 2005
    ..To evaluate the performance of a combined hybrid radiography/magnetic resonance (MR) unit to guide portal vein (PV) puncture during human transjugular intrahepatic portosystemic shunt (TIPS) creation...
  30. ncbi request reprint Robust x-ray tubes for use within magnetic fields of MR scanners
    Zhifei Wen
    Department of Radiology and Department of Physics, Stanford University, Stanford, California 94305, USA
    Med Phys 32:2327-36. 2005
    ..Results show that both correction schemes enhance the robustness of the x-ray tube operation in an externally applied magnetic field...
  31. ncbi request reprint X-ray compatible radiofrequency coil for magnetic resonance imaging
    Viola Rieke
    Department of Radiology, Stanford University, Stanford, California 94305 5488, USA
    Magn Reson Med 53:1409-14. 2005
    ..The X-ray compatible coils allowed for fluoroscopic X-ray image acquisition, without degradation by the coil, while maintaining excellent MR imaging qualities...
  32. ncbi request reprint Transjugular intrahepatic portosystemic shunt creation in a polycystic liver facilitated by hybrid cross-sectional/angiographic imaging
    Daniel Y Sze
    Department of Radiology, Stanford University Medical Center, H 3646, Stanford, California 94305 5642, USA
    J Vasc Interv Radiol 17:711-5. 2006
    ..Such a hybrid 3D reconstruction-enabled angiography system was used for safe image guidance of a TIPS procedure in a patient with PCLD. This technology has the potential to expedite any image-guided procedure that requires 3D navigation...
  33. pmc In vitro evaluation of the imaging accuracy of C-arm conebeam CT in cerebral perfusion imaging
    A Ganguly
    Department of Radiology, Stanford University, Stanford, CA 94305, USA
    Med Phys 39:6652-9. 2012
    ..The authors have previously demonstrated its feasibility in vivo using an animal model. In this paper, the authors describe an in vitro technique to evaluate the accuracy of their method for measuring the relevant temporal signals...
  34. ncbi request reprint A prototype table-top inverse-geometry volumetric CT system
    Taly Gilat Schmidt
    Department of Radiology, Stanford University, Stanford, California 94305, USA
    Med Phys 33:1867-78. 2006
    ..Overall, the successful implementation of the prototype system supports the IGCT concept for single-rotation volumetric scanning free from cone-beam artifacts...
  35. pmc Cerebral CT perfusion using an interventional C-arm imaging system: cerebral blood flow measurements
    A Ganguly
    Department of Radiology, Stanford University, California 94305 5488, USA
    AJNR Am J Neuroradiol 32:1525-31. 2011
    ..However, C-arms rotate slower than clinical CT scanners, making CTP challenging. We developed a cerebral CTP protocol for C-arm CBCT and evaluated it in an animal study...
  36. ncbi request reprint Clinical fluoroscopic fiducial-based registration of the vertebral body in spinal neuronavigation
    H R Abbasi
    Image Guidance Laboratories, Stanford University, USA
    Stud Health Technol Inform 81:1-7. 2001
    ..48 mm. The resulting system leverages equipment already commonly available in the operating room (OR), providing an important new functionality that is free of many current limitations, while keeping costs contained...
  37. pmc Shimming with permanent magnets for the x-ray detector in a hybrid x-ray/ MR system
    Zhifei Wen
    Department of Radiology, Stanford University, Stanford, California 94305, USA
    Med Phys 35:3895-902. 2008
    ..Experimental results demonstrate great promise for this technique, which may be useful in many settings where devices with magnetic components need to be placed inside or close to an MR scanner...
  38. doi request reprint Experimental study of intracranial hematoma detection with flat panel detector C-arm CT
    H Arakawa
    Department of Radiology, Stanford University Medical Center, 300 Pasteur Dr, Stanford, CA 94305 5105, USA
    AJNR Am J Neuroradiol 29:766-72. 2008
    ..We evaluated its ability to detect small intracranial hematomas in a swine model...
  39. ncbi request reprint Pair of resonant fiducial markers for localization of endovascular catheters at all catheter orientations
    Titus Kuehne
    Department of Radiology, Stanford University, Palto Alto, California 94304, USA
    J Magn Reson Imaging 17:620-4. 2003
    ..Current markers loose their signal enhancement for certain catheter orientations. The purpose of this study was to test a marker setup which overcomes this orientation problem...
  40. ncbi request reprint Fully truncated cone-beam reconstruction on Pi lines using prior CT
    Krishnakumar Ramamurthi
    Johns Hopkins University, Electrical and Computer Engineering, Baltimore, MD 21218, USA
    Med Image Comput Comput Assist Interv 8:631-8. 2005
    ..A method for integrating prior CT is developed using the concept of pi-lines and tested on real flat-panel and simulated cone-beam data...
  41. ncbi request reprint Correction of XRII geometric distortion using a liquid-filled grid and image subtraction
    David W Holdsworth
    Imaging Research Laboratories, Robarts Research Institute, London N6A 5K8, Ontario, Canada
    Med Phys 32:55-64. 2005
    ..Applications for this technique include stereotactic surgery, radiosurgery, x-ray stereogrammetry, and other image-guided procedures...
  42. ncbi request reprint Compatibility of interventional x-ray and magnetic resonance imaging: feasibility of a closed bore XMR (CBXMR) system
    Lukasz Brzozowski
    Department of Medical Biophysics, Sunnybrook Health Sciences Centre, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5, Canada
    Med Phys 33:3033-45. 2006
    ..The homogeneity of the MRI signal in the normal field of view was not significantly degraded by the presence of these x-ray components in the vicinity of the MRI bore entrance...
  43. ncbi request reprint Towards cardiac C-arm computed tomography
    Günter Lauritsch
    Siemens AG, Medical Solutions, 91301 Forchheim, Germany
    IEEE Trans Med Imaging 25:922-34. 2006
    ..First results in simulation, using an experimental phantom, and in preclinical in vivo studies showed that excellent image quality can be achieved...
  44. pmc Closed bore XMR (CBXMR) systems for aortic valve replacement: investigation of rotating-anode x-ray tube heat loadability
    John A Bracken
    Sunnybrook Health Sciences Center Department of Medical Biophysics, University of Toronto, 2075 Bayview Avenue, Toronto, Ontario M4N 3M5, Canada
    Med Phys 35:4049-62. 2008
    ....

Research Grants14

  1. C-Arm CT for Guidence of Cardiac Interventions
    Rebecca Fahrig; Fiscal Year: 2010
    ..Access to such images, during an interventional procedure, could also enable new, directed treatments for myocardial infarction by allowing accurate guidance of therapy (cell, drug etc.) directly to the affected tissue. ..
  2. Dual kV/MV Imaging for Metal Artifact Reduction
    JOSH MORRIS STAR LACK; Fiscal Year: 2010
    ..We plan to overcome this limitation by designing and building a new, combined kV/MV imaging system that provides excellent images without requiring a significant increase in dose to the patient. ..
  3. MR-Compatible X-Ray Tube
    Rebecca Fahrig; Fiscal Year: 2010
    ..This x-ray tube will enable the next generation of hybrid XMR systems. ..
  4. MR-Compatible X-Ray Tube
    Rebecca Fahrig; Fiscal Year: 2009
    ..This x-ray tube will enable the next generation of hybrid XMR systems. ..
  5. Efficient Scatter Correction
    Rebecca Fahrig; Fiscal Year: 2007
    ....
  6. Improved C-Arm CT for Interventional Procedures
    Rebecca Fahrig; Fiscal Year: 2006
    ..The significance of this project is amplified by the fact that the technology developed here could eventually impact many other minimally invasive procedures. ..
  7. Hybrid X-Ray/MR Systems for Image-Guided Procedures
    Rebecca Fahrig; Fiscal Year: 2004
    ..The hybrid system, once perfected, will remove the compromise involved in choosing a guidance modality, improving and enabling new minimally invasive procedures. ..
  8. MR-Compatible X-Ray Tube
    Rebecca Fahrig; Fiscal Year: 2009
    ..This x-ray tube will enable the next generation of hybrid XMR systems. ..