John J DeMarco

Summary

Affiliation: University of California
Country: USA

Publications

  1. ncbi request reprint A CT-based Monte Carlo simulation tool for dosimetry planning and analysis
    J J DeMarco
    Jonsson Comprehensive Cancer Center, Department of Radiation Oncology, University of California Los Angeles, 90024 6951, USA
    Med Phys 25:1-11. 1998
  2. ncbi request reprint Dosimetric parameters for three low-energy brachytherapy sources using the Monte Carlo N-particle code
    John J DeMarco
    Department of Radiation Oncology, UCLA School of Medicine, Los Angeles, California 90095 6951, USA
    Med Phys 29:662-8. 2002
  3. ncbi request reprint An analysis of MCNP cross-sections and tally methods for low-energy photon emitters
    John J DeMarco
    UCLA Department of Radiation Oncology, University of California, Los Angeles 90095 6951, USA
    Phys Med Biol 47:1321-32. 2002
  4. ncbi request reprint A Monte Carlo tutorial and the application for radiotherapy treatment planning
    J J DeMarco
    UCLA Department of Radiation Oncology, University of California Los Angeles, 90095 6951, USA
    Med Dosim 27:43-50. 2002
  5. ncbi request reprint CT-based dosimetry calculations for 125I prostate implants
    J J DeMarco
    Department of Radiation Oncology, University of California, Los Angeles 90095 6951, USA
    Int J Radiat Oncol Biol Phys 45:1347-53. 1999
  6. pmc The feasibility of a scanner-independent technique to estimate organ dose from MDCT scans: using CTDIvol to account for differences between scanners
    Adam C Turner
    Department of Biomedical Physics, David Geffen School of Medicine, University of California, Los Angeles, California 90024, USA
    Med Phys 37:1816-25. 2010
  7. pmc Dose to radiosensitive organs during routine chest CT: effects of tube current modulation
    Erin Angel
    Department of Radiology and Radiation Oncology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
    AJR Am J Roentgenol 193:1340-5. 2009
  8. pmc Monte Carlo simulations to assess the effects of tube current modulation on breast dose for multidetector CT
    Erin Angel
    Department of Radiology, UCLA David A Geffen School of Medicine, University of California at Los Angeles, 924 Westwood Blvd Ste 650, Los Angeles, CA 90024, USA
    Phys Med Biol 54:497-512. 2009
  9. doi request reprint Peak skin and eye lens radiation dose from brain perfusion CT based on Monte Carlo simulation
    Di Zhang
    Department of Radiological Sciences, UCLA David Geffen School of Medicine, Los Angeles, CA, USA
    AJR Am J Roentgenol 198:412-7. 2012
  10. pmc Variability of surface and center position radiation dose in MDCT: Monte Carlo simulations using CTDI and anthropomorphic phantoms
    Di Zhang
    David Geffen School of Medicine, UCLA, Los Angeles, California 90024, USA
    Med Phys 36:1025-38. 2009

Detail Information

Publications27

  1. ncbi request reprint A CT-based Monte Carlo simulation tool for dosimetry planning and analysis
    J J DeMarco
    Jonsson Comprehensive Cancer Center, Department of Radiation Oncology, University of California Los Angeles, 90024 6951, USA
    Med Phys 25:1-11. 1998
    ..The dose distribution from a typical mediastinum treatment planning setup is presented for qualitative analysis and comparison versus a conventional treatment planning system...
  2. ncbi request reprint Dosimetric parameters for three low-energy brachytherapy sources using the Monte Carlo N-particle code
    John J DeMarco
    Department of Radiation Oncology, UCLA School of Medicine, Los Angeles, California 90095 6951, USA
    Med Phys 29:662-8. 2002
    ..Radial dose function, g(r), calculated to a distance of 10 cm, and an isotropy function, F(r, theta), calculated for radii from 0.5 to 7.0 cm, were found to be in close agreement with previously published data...
  3. ncbi request reprint An analysis of MCNP cross-sections and tally methods for low-energy photon emitters
    John J DeMarco
    UCLA Department of Radiation Oncology, University of California, Los Angeles 90095 6951, USA
    Phys Med Biol 47:1321-32. 2002
    ..Significant differences between the collision kerma tally and the absorbed dose tally can occur when using the DLC-200 attenuation coefficients in conjunction with a modern tabulation of mass energy-absorption coefficients...
  4. ncbi request reprint A Monte Carlo tutorial and the application for radiotherapy treatment planning
    J J DeMarco
    UCLA Department of Radiation Oncology, University of California Los Angeles, 90095 6951, USA
    Med Dosim 27:43-50. 2002
    ..The effects of statistical uncertainty on the Monte Carlo calculation are also presented...
  5. ncbi request reprint CT-based dosimetry calculations for 125I prostate implants
    J J DeMarco
    Department of Radiation Oncology, University of California, Los Angeles 90095 6951, USA
    Int J Radiat Oncol Biol Phys 45:1347-53. 1999
    ....
  6. pmc The feasibility of a scanner-independent technique to estimate organ dose from MDCT scans: using CTDIvol to account for differences between scanners
    Adam C Turner
    Department of Biomedical Physics, David Geffen School of Medicine, University of California, Los Angeles, California 90024, USA
    Med Phys 37:1816-25. 2010
    ..This was accomplished by assessing the ability of CTDIvol measurements to account for differences in MDCT scanners that lead to organ dose differences...
  7. pmc Dose to radiosensitive organs during routine chest CT: effects of tube current modulation
    Erin Angel
    Department of Radiology and Radiation Oncology, David Geffen School of Medicine at UCLA, Los Angeles, CA, USA
    AJR Am J Roentgenol 193:1340-5. 2009
    ....
  8. pmc Monte Carlo simulations to assess the effects of tube current modulation on breast dose for multidetector CT
    Erin Angel
    Department of Radiology, UCLA David A Geffen School of Medicine, University of California at Los Angeles, 924 Westwood Blvd Ste 650, Los Angeles, CA 90024, USA
    Phys Med Biol 54:497-512. 2009
    ..The results indicate that radiation dose to glandular breast tissue generally decreases with the use of tube current modulated CT acquisition, but that patient size (and in some cases patient positioning) may affect dose reduction...
  9. doi request reprint Peak skin and eye lens radiation dose from brain perfusion CT based on Monte Carlo simulation
    Di Zhang
    Department of Radiological Sciences, UCLA David Geffen School of Medicine, Los Angeles, CA, USA
    AJR Am J Roentgenol 198:412-7. 2012
    ....
  10. pmc Variability of surface and center position radiation dose in MDCT: Monte Carlo simulations using CTDI and anthropomorphic phantoms
    Di Zhang
    David Geffen School of Medicine, UCLA, Los Angeles, California 90024, USA
    Med Phys 36:1025-38. 2009
    ..These findings have potential implications for small-sized dosimeter measurements in phantoms, such as with TLDs or small Farmer chambers...
  11. pmc A comparison of methods to estimate organ doses in CT when utilizing approximations to the tube current modulation function
    Maryam Khatonabadi
    David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California 90024, USA
    Med Phys 39:5212-28. 2012
    ....
  12. ncbi request reprint A seed specific dose kernel method for low-energy brachytherapy dosimetry
    John J DeMarco
    Department of Radiation Oncology, UCLA School of Medicine, Los Angeles, California 90095, USA
    J Appl Clin Med Phys 4:66-74. 2003
    ..Good agreement is achieved for a representative pre- and post-plan comparison versus a commercial implementation of the TG-43 brachytherapy dosimetry protocol...
  13. pmc The feasibility of patient size-corrected, scanner-independent organ dose estimates for abdominal CT exams
    Adam C Turner
    Department of Biomedical Physics and Department of Radiology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California 90024, USA
    Med Phys 38:820-9. 2011
    ..This was done by determining the influence of patient size on organ dose conversion coefficients generated for typical abdominal CT exams...
  14. pmc A method to generate equivalent energy spectra and filtration models based on measurement for multidetector CT Monte Carlo dosimetry simulations
    Adam C Turner
    Department of Biomedical Physics and Department of Radiology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California 90024, USA
    Med Phys 36:2154-64. 2009
    ..These results demonstrate that an equivalent source model based only on measured values can be used in place of manufacturer's data for Monte Carlo simulations for MDCT dosimetry...
  15. pmc Reducing radiation dose to selected organs by selecting the tube start angle in MDCT helical scans: a Monte Carlo based study
    Di Zhang
    David Geffen School of Medicine at UCLA, Los Angeles, California 90024, USA
    Med Phys 36:5654-64. 2009
    ..The purpose of this work was to perform preliminary investigations into the feasibility of exploiting these variations to reduce dose to selected radiosensitive organs solely by varying the tube start angle in CT scans...
  16. ncbi request reprint Dosimetric parameters of three new solid core I-125 brachytherapy sources
    Timothy D Solberg
    Department of Radiation Oncology, UCLA School of Medicine, Los Angeles, California 98095 6951, USA
    J Appl Clin Med Phys 3:119-34. 2002
    ..All dosimetric parameters were found to be in close agreement with previously published data for similar source configurations. The MCNP Monte Carlo code appears to be ideally suited to low energy dosimetry applications...
  17. doi request reprint Attenuation of iodine 125 radiation with vitreous substitutes in the treatment of uveal melanoma
    Scott C N Oliver
    Department of Ophthalmology, Jules Stein Eye Institute, University of California Los Angeles, 100 Stein Plaza, Los Angeles, CA 90095, USA
    Arch Ophthalmol 128:888-93. 2010
    ..To demonstrate attenuation of radiation from iodine 125 ((125)I) to intraocular structures using liquid vitreous substitutes...
  18. doi request reprint The feasibility of a regional CTDIvol to estimate organ dose from tube current modulated CT exams
    Maryam Khatonabadi
    Department of Biomedical Physics and Department of Radiology, David Geffen School of Medicine, University of California, Los Angeles, Los Angeles, California 90024
    Med Phys 40:051903. 2013
    ..These exams can be more accurately assessed for dose using regional CTDIvol descriptors that account for local variations in scanner output present when TCM is employed...
  19. ncbi request reprint Improvements in prostate brachytherapy dosimetry due to seed stranding
    Kevin Lin
    Department of Radiation Oncology, University of California, Los Angeles, CA 90095, USA
    Brachytherapy 6:44-8. 2007
    ..In order to contribute to the understanding of whether seed stranding improves dosimetry, we present retrospective data from our institution...
  20. ncbi request reprint A Monte Carlo based phase space model for quality assurance of intensity modulated radiotherapy incorporating leaf specific characteristics
    Randi F Aaronson
    Department of Radiation Oncology, University of California, Los Angeles, California 90095 6951, USA
    Med Phys 29:2952-8. 2002
    ..53 criteria for all benchmark fields used. Film dosimetry was used to evaluate the model for IMRT sequences and plans, and the ability of the model to account for leaf sequencing effects is also demonstrated...
  21. ncbi request reprint Patient specific quality assurance for the delivery of intensity modulated radiotherapy
    Nzhde Agazaryan
    Department of Radiation Oncology, UCLA School of Medicine, 200 UCLA Medical Plaza, Suite B265, Los Angeles, California 90095 6951, USA
    J Appl Clin Med Phys 4:40-50. 2003
    ..Absolute dosimetry for each composite plan is performed using an ionization chamber. To date, excellent agreement between measurements and calculations has been observed...
  22. pmc Radiation dose to the fetus for pregnant patients undergoing multidetector CT imaging: Monte Carlo simulations estimating fetal dose for a range of gestational age and patient size
    Erin Angel
    Department of Radiology, David A Geffen School of Medicine, University of California at Los Angeles, 924 Westwood Blvd, Suite 650, Los Angeles, CA 90024, USA
    Radiology 249:220-7. 2008
    ....
  23. pmc Radiation enhances regulatory T cell representation
    Evelyn L Kachikwu
    Department of Radiation Oncology, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095 1714, USA
    Int J Radiat Oncol Biol Phys 81:1128-35. 2011
    ..This study was undertaken to evaluate the impact of radiation therapy (RT) on immunosuppressive T regulatory (Treg) cells...
  24. doi request reprint Initial clinical experience with image-guided linear accelerator-based spinal radiosurgery for treatment of benign nerve sheath tumors
    Michael T Selch
    Department of Radiation Oncology, David Geffen School of Medicine at UCLA, Los Angeles, CA 90095 6951, USA
    Surg Neurol 72:668-74; discussion 674-5. 2009
    ..Stereotactic radiosurgery has proven a safe and effective treatment of cranial nerve sheath tumors. A similar approach should be successful for histologically identical spinal nerve sheath tumors...
  25. ncbi request reprint Time-course of effects of external beam radiation on [18F]FDG uptake in healthy tissue and bone marrow
    Adam L Kesner
    Department of Molecular and Medical Pharmacology, David Geffen School of Medicine, University of California, Los Angeles, CA 90095 6942, USA
    J Appl Clin Med Phys 9:2747. 2008
    ....
  26. ncbi request reprint Antiproton radiotherapy
    Niels Bassler
    Department of Experimental Clinical Oncology, Aarhus University Hospital, Aarhus, Denmark
    Radiother Oncol 86:14-9. 2008
    ..This will enable us to perform planning studies, where the potential clinical consequences can be examined, and compared to those of other beam modalities such as protons, carbon ions, or IMRT photons...
  27. ncbi request reprint Report of the AAPM Task Group No. 105: Issues associated with clinical implementation of Monte Carlo-based photon and electron external beam treatment planning
    Indrin J Chetty
    University of Michigan, Ann Arbor, Michigan 48109, USA
    Med Phys 34:4818-53. 2007
    ....