Faculty Summaries
C-M Charlie Ma, PhD
C-M Charlie Ma, PhD
Professor
  • Vice Chairman, Department of Radiation Oncology
  • Director, Radiation Physics
Charlie.ma@fccc.edu
Office Phone: 215-728-2996
Fax: 215-728-4789
Office: P2028

2000 - Present

  • Fourkal E, Velchev I, Ma CM, Fan J. Linear energy transfer of proton clusters. Phys Med Biol. 2011 May 21;56(10):3123-36. PubMed
  • Chibani O, Moftah B, Ma CM. On Monte Carlo modeling of megavoltage photon beams: A revisited study on the sensitivity of beam parameters. Med Phys. 2011 Jan;38(1):188-201. PubMed
  • Eldib AA, ElGohary MI, Fan JJ, Jin LH, Li JS, Ma CM, Elsherbini NA. Dosimetric characteristics of an electron multileaf collimator for modulated electron radiation therapy. Journal of Applied Clinical Medical Physics. 2010;11(2):5-22. PubMed
  • Ma CM. On the definition of biologically equivalent radiation dose quantities. Med Phys. 2010 May;37(5):2394-5. PubMed
  • Chen LL, Paskalev K, Xu X, Zhu J, Wang L, Price RA, Hu W, Feigenberg SJ, Horwitz EM, Pollack A, Ma CM. Rectal dose variation during the course of image-guided radiation therapy of prostate cancer. Radiother Oncol. 2010 May;95(2):198-202. PubMed
  • Li JS, Lin T, Chen LL, Price RA, Ma CM. Uncertainties in IMRT dosimetry. Med Phys. 2010 Jun;37(6):2491-500. PubMed
  • Xu QY, He ZJ, Fan JJ, Hamilton RJ, Chen Y, Ma CM, Xing L. Registration of on-board X-ray images with 4DCT: A proposed method of phase and setup verification for gated radiotherapy. Physica Medica. 2010 Jul;26(3):117-25. PubMed
  • Chen LL, Mu ZM, Hachem P, Ma CM, Wallentine A, Pollack A. MR-guided focused ultrasound: enhancement of intratumoral uptake of H-3 -docetaxel in vivo. Phys Med Biol. 2010 Dec;55(24):7399-410. PubMed
  • Fourkal E, Veltchev I, Ma CM. Laser-to-proton energy transfer efficiency in laser-plasma interactions. Journal of Plasma Physics. 2009 Apr;75:235-50.
  • Konski A, Movsas B, Konopka M, Ma C-M, Price R, Pollack A. Developing a radiation error scoring system to monitor quality control events in a radiation oncology department. J Am Coll Radiol. 2009;6(1): 45-50. PubMed
  • Lin T, Chen Y, Hossain M, Li J, Ma C-M. Dosimetric investigation of high dose rate, gated IMRT. Med Phys. 2008;35(11):5079-87. PubMed
  • Wang L, Hayes S, Paskalev K, Jin L, Buyyounouski MK, Ma C-M, Feigenberg S. Dosimetric comparison of stereotactic body radiotherapy using 4D CT and multiphase CT images for treatment planning of lung cancer: Evaluation of the impact on daily dose coverage. Radiother Oncol. 2008 Dec 24. PubMed
  • Jin L, Ma CM, Fan J, Eldib A, Price RA, Chen L, Wang L, Chi Z, Xu Q, Sherif M, Li JS. Dosimetric verification of modulated electron radiotherapy delivered using a photon multileaf collimator for intact breasts, Phys Med Biol. 2008;53(21):6009-25. PubMed
  • Luo W, Li J, Fourkal E, Fan J, Xu X, Chen Z, Jin L, Price R, Ma C-M. Dosimetric advantages of IMPT over IMRT for laser-accelerated proton beams. Physics in Medicine and Biology, 2008;53(24):7151-66. PubMed
  • Ibbott G, Ma C-M, Rogers DWO, Seltzer SM, and Williamson JF, Anniversary paper: Fifty years of AAPM involvement in radiation dosimetry. Medical Physics, 2008;35: 1418-1427. PubMed
  • Klein EE, Vicic M, Ma C-M, Low DA, Drzymala RE, Validation of calculations for electrons modulated with conventional photon multileaf collimators. Phys Med Biol. 2008 Mar 7;53(5):1183-208. PubMed
  • Ma C-M, Li JS, Deng J, Fan J. Implementation of Monte Carlo Dose Calculation for CyberKnife treatment planning, Journal of Physics: Conference Series. 2008;102:012016(1-10).
  • JS Li and C-M Ma, A method to reduce the statistical uncertainty caused by high-energy cutoffs in Monte Carlo treatment planning, Journal of Physics: Conference Series. 2008;102:012015(1-5).
  • Ding M, Newman F, Gaspar L, Kavanagh B, Johnson T, Stuhr K, Raben D, Li JS, Ma C-M. Evaluation of motion effect on lung cancer radiotherapy, Journal of Physics: Conference Series. 2008;102:012008(1-6).
  • Veltchev I, Fourkal E, Ma C-M. Laser-induced Coulomb mirror effect: Applications for proton acceleration, Physics of Plasmas. 2007;14:033106.
  • Freedman GM, Anderson PR, Goldstein LJ, Ma CM, Li J, Swaby RF, Litwin S, Watkins-Bruner D, Sigurdson ER, Morrow M. Four-week course of radiation for breast cancer using hypofractionated intensity modulated radiation therapy with an incorporated boost. Int J Radiat Oncol Biol Phys. 2007;68:347-53. PubMed
  • Fourkal E, Veltchev I,Fan J, Luo W, Ma C-M. Energy optimization procedure for treatment planning with laser-accelerated protons. Med Phys. 2007;34:577-84. PubMed
  • Fourkal E, Veltchev I, Ma C-M, Smolyakov A. Resonant transparency of opaque materials. Physics Letters A 361. 2007;277–282
  • Jin L, Wang L, Li J, Luo W, Feigenberg SJ, Ma C-M. Investigation of optimal beam margins for stereotactic radiotherapy of lung-cancer using Monte Carlo dose calculations. Phys Med Biol. 2007;52:3549–3561. PubMed
  • Chen L, Nguyen T, Jones E, Chen Z, Luo W, Wang L, Price Jr RA, Pollack A, Ma C-M. Magnetic resonance-based treatment planning for prostate intensity-modulated radiotherapy: creation of digitally reconstructed radiographs. Int J Radiat Oncol Biol Phys. 2007;68:903-11. PubMed
  • Wang L, Feigenberg S, Chen L, Pasklev K, Ma C-M. Benefit of image-guided stereotactic target localization for hypofractionated treatment of lung cancer, Int. J Radiat Oncol Biol Phys. 2007;66:738-47. PubMed
  • Chibani O, Ma C-M. On the discrepancies between Monte Carlo dose calculations and measurements for the 18 MV Varian photon beam. Med Phys. 2007;34:1206-16. PubMed
  • Fan J, Luo W, Fourkal E, Lin T, Li J, Veltchev I, Ipe NE, Ma C-M. Shielding design for a laser-accelerated proton therapy system. Phys Med Biol. 2007;52: 3913-3930. PubMed
  • Feigenberg S, Paskalev K, McNeeley S, Horwitz E, Konski A, Wang L, Ma C-M, Pollack A. Comparing computed tomography localization with daily ultrasound during image-guided radiation therapy for the treatment of prostate cancer: a prospective evaluation, Journal of Applied Clinical Medical Physics. 2007;8:99-110. PubMed
  • Chetty I, Curran B, Cygler J, DeMarco J, Ezzell G, Faddegon B, Kawrakow I, Keall P, Liu H, Ma C-M, Sheikh-Baghery D, Rogers D, Seuntjens J, Siebers J. The AAPM Task Group Report No. 105: Issues associated with clinical implementation of Monte Carlo-based external beam treatment planning. Med Phys. 2007;34:4818-53. PubMed
  • Murphy M, Balter J, Balter S, BenComo J, Das I, Jiang SB, Ma C-M, Olivera G, Rodebaugh R, Ruchala K, Shirato H, and F-FYin, AAPM TG75 Report: The Management of Imaging Dose During Image-guided Radiotherapy. Med Phys. 2007;34:4041-4063. PubMed
  • Stathakis S, Li JS, Ma C-M, Monte Carlo determination of radiation-induced cancer risks for prostate patients undergoing intensity-modulated radiation therapy. Journal of Applied Clinical Medical Physics. 2007;8:14-27. PubMed
  • Ma C-M, Veltchev I, Fourkal E, Li JS, Luo W, Fan J, Lin T, Pollack A. Development of a Laser Driven Proton Accelerator for Cancer Therapy. Laser Physics. 2006;16:639-646
  • Wang L, Li J, Paskalev K,Hoban P, Luo W, Chen L, McNeeley S, Price RA, Ma C-M. Commissioning and quality assurance of a commercial stereotactic treatment planning system for extracranial IMRT. J. Applied Clinical Med. Phys. 2006;7:21-34. PubMed
  • Pollack A, Hanlon A, Horwitz EM, Feigenberg SJ, Konski AA, Movsas B, Greenberg RE, Uzzo RG, Ma C-M, McNeeley SW, Buyyounouski MK, Price Jr RA. Dosimetry and Preliminary Acute Toxicity In The First 100 Men Treated For Prostate Cancer On A Randomized Hypofractionation Dose Escalation Trial. Int J Radiat Oncol Biol Phys. 2006;64:518-26. PubMed
  • Ma C-M, Paskalev K. In-Room CT Techniques for Image-Guided Radiation Therapy. Med Dosimetry. 2006;31:30-39. PubMed
  • Fan J, Li J, Chen L, Stathakis S, Luo W, du Plessis F, Xiong W,Ma C-M. A Practical Monte Carlo MU Verification Tool for IMRT Quality Assurance. 2006;51:2503-15. PubMed
  • Stathakis S, Li JS, Paskalev K, Yang J, Wang L, Ma C-M. Ultra-thin TLD’s for skin dose determination in high energy photon beams. Phys Med Biol. 2006;51:3549-67. PubMed
  • Luo W, Li JS, Price B, Chen L, Yang J, Fan J, Chen Z, McNeeley S, Ma C-M. Monte Carlo based IMRT QA using MLC log files and R/V outputs. Med Phys. 2006;33:2557-64. PubMed
  • Fourkal E, Veltchev I, Ma C-M. Evanescent wave interference and the total transparency of a warm high-density plasma slab. Physics of Plasmas 2006;13:092113
  • Price RA, Hannoun-Levi JM, Horwitz E, Buyyounouski M, Ruth KJ, Ma C-M, Pollack A. The impact of pelvic nodal irradiation with IMRT on the treatment of prostate cancer. Int J Radiat Oncol Biol Phys. 2006;66:583-9. PubMed
  • Ma CM and Maughan RL. Within the next decade conventional cyclotrons for proton radiotherapy will become obsolete and replaced by far less expensive machines using compact laser systems for the acceleration of the protons. Med Phys. 2006;33(3):571-3.
  • du Plessis FC, Leal A, et al. Characterization of megavoltage electron beams delivered through a photon multi-leaf collimator (pMLC). Phys Med Biol. 2006;51(8):2113-29. PubMed
  • Chen, Z, Ma CM, et al. Investigation of MR image distortion for radiotherapy treatment planning of prostate cancer. Phys Med Biol. 2006;51(6):1393-403. PubMed
  • Li JS, Shahine B, Fourkal E, Ma C-M. A Particle Track Repeating Algorithm for Proton Beam Dosimetry. Phys Med Biol. 2005;50:1001-1010. PubMed
  • Luo W,Fourkal E, Li J, Ma C-M. Particle selection and beam collimation system for laser-accelerated proton beam therapy. Med Phys. 2005;32:794-806. PubMed
  • Yang J, Li J, Chen L,Price R, McNeeley S, Qin L, Wang L, Xiong W, Ma C-M. Dosimetric verification of IMRT treatment planning using Monte Carlo simulations for prostate cancer. Phys Med Biol. 2005;50:869-878. PubMed
  • Paskalev K, Feigenberg S, Wang L, Movsas B, Laske D, Ma C-M. A method for repositioning of stereotactic brain patients with the aid of real-time CT image guidance. Phys Med Biol. 2005;50:N201–N207. PubMed
  • K Paskalev, S Feigenberg, R Jacob, S McNeeley, E Horwitz, R Price, C Ma, and A Pollack, "Target localization for post-prostatectomy patients using CT and ultrasound image guidance," J Appl Clin Med Phys 2005;6(4):40-49(2005). PubMed
  • Price RA, Paskalev K, McNeeley S, Ma C-M. Elongated beamlets: a simple technique for segment and MU reduction for sMLC IMRT delivery on accelerators utilizing 5 mm leaf widths. Phys Med Biol. 2005;50:N235–N242. PubMed
  • Wang L, Hoban P, Paskalev K, Yang J, Li JS, Chen L, Xiong W, Ma C-M. Dosimetric advantage and clinical implication of a micro-multileaf collimator in the treatment of prostate with intensity modulated radiotherapy. Med Dosimetry. 2005;30:97-103. PubMed
  • Xiong W, Li J, et al. Effect of patient variation on standard- and hypo-fractionated radiotherapy of prostate cancer. Phys Med Biol. 2005;50(7):1483-92. PubMed
  • Stathakis S, Price R, Jr, et al. Dosimetry validation of treatment room shielding design. 2005;Med Phys 32(2):448-54. PubMed
  • Ma CM, Li JS, et al. Effect of statistical uncertainties on Monte Carlo treatment planning. Phys Med Biol. 2005;50(5):891-907. PubMed
  • Fourkal E, Velchev I, et al. Coulomb explosion effect and the maximum energy of protons accelerated by high-power lasers. Phys Rev E Stat Nonlin Soft Matter Phys. 2005;71(3 Pt 2B):036412. PubMed
  • Paskalev K, Ma CM, et al. Daily target localization for prostate patients based on 3D image correlation. Phys Med Biol. 2004;49(6):931-9. PubMed
  • Nardi E, Barnea G, et al. Electron beam therapy with coil-generated magnetic fields. Med Phys. 2004;31(6):1494-503. PubMed
  • Ma CM, Price RA Jr, et al. Monitor unit calculation for Monte Carlo treatment planning. Phys Med Biol. 2004;49(9):1671-87. PubMed
  • Deng J, Guerrero T, et al. Modelling 6 MV photon beams of a stereotactic radiosurgery system for Monte Carlo treatment planning. Phys Med Biol. 2004;49(9):1689-704. PubMed
  • Chen L, PriceRA Jr, et al. MRI-based treatment planning for radiotherapy: dosimetric verification for prostate IMRT. Int J Radiat Oncol Biol Phys. 2004;60(2):636-47. PubMed
  • Chen L, Price RA Jr, et al. Dosimetric evaluation of MRI-based treatment planning for prostate cancer. Phys Med Biol. 2004;49(22):5157-70. PubMed
  • Yang J, Li JS, Ma C-M Modeling of electron contamination in clinical photo beams for Monte Carlo dose calculation. Med Phys. 2004;49:2657-73.
  • Xiong W, Li JS, Price RA, Ding M, Qin LH, Yang J, Chen L, Ma C-M. Optimization of combined photon and electron beams for breast cancer treatment. Phys Med Biol. 2004;49:1973-8. PubMed
  • Pawlicki T, Luxton G, Le Q, Findley D, Ma C-M. Lens dose in MLC-based IMRT treatments of the head and neck. IntlInt J Radiat Oncol Biol Phys. 2004;59:293-299. PubMed
  • Li JS, Freedman GM, Price R, Wang L, Anderson P, Chen L, Xiong W, Yang J, Pollack A, Ma C-M. Clinical implementation of intensity-modulated tangential beam irradiation for breast cancer. Med Phys. 2004;1023-31. PubMed
  • Wang L, Movsas B, Jacob R, Fourkal E, Chen L, Price R, Feigenberg S, Konski A, Pollack A, Ma C-M. Stereotactic IMRT for prostate cancer: Dosimetric impact of multileaf collimator leaf width in the treatment of prostate cancer with IMRT. J Applied Clinical Med Phys. 2004;5:29-41. PubMed
  • Wang L, Jacob R, Chen L, Feigenberg S, A Konski A, Ma C-M, Movsas B. Stereotactic IMRT for prostate cancer: Setup accuracy of a new stereotactic body localization system. J Applied Clinical Med Phys. 2004;5:18-28. PubMed
  • Price RA, Chibani O, et al. Shielding evaluation for IMRT implementation in an existing accelerator vault. J Appl Clin Med Phys. 2003;4(3):231-8. PubMed
  • Price RA, Murphy S, McNeeley S, Ma CM, et al. A Method for Increased Dose Conformity and Segment Reduction for sMLC Delivered IMRT Treatment of the Prostate. Int J Radiat Oncol Biol Phys. 2003;57:843-852. PubMed
  • Ma CM Jiang SB, et al. A quality assurance phantom for IMRT dose verification. Phys Med Biol. 2003;48(5):561-72. PubMed
  • Ma CM, Ding M, et al. A comparative dosimetric study on tangential photon beams, intensity-modulated radiation therapy (IMRT) and modulated electron radiotherapy (MERT) for breast cancer treatment. Phys Med Biol. 2003;48(7):909-24. PubMed
  • Fourkal E, Li JS, et al. Intensity modulated radiation therapy using laser-accelerated protons: a Monte Carlo dosimetric study. Phys Med Biol. 2003;48(24):3977-4000. PubMed
  • FourkalE, Li JS, et al. Particle selection for laser-accelerated proton therapy feasibility study. Med Phys. 2003;30(7):1660-70. PubMed
  • Ding M, Li J, et al. Dose correlation for thoracic motion in radiation therapy of breast cancer. Med Phys. 2003;30(9):2520-9. PubMed
  • Deng J, Ma CM, et al. Commissioning 6 MV photon beams of a stereotactic radiosurgery system for Monte Carlo treatment planning. Med Phys. 2003;30(12):3124-34. PubMed
  • Chibani O, and Ma CM. Photonuclear dose calculations for high-energy photon beams from Siemens and Varian linacs. 2003 Med Phys. 30(8):1990-2000. PubMed
  • Ma CM, Price RA, et al. Clinical implementation and quality assurance for intensity modulated radiation therapy. IAEA: Standards and Codes of Practice in Medical Radiation Dosimetry. 2002 Vienna, Austria.
  • Ma C, Pawlicki MT, et al. Accurate Dosimetry for Intensity Modulated Radiation Therapy. Accurate dosimetry for radiation dosimetry. J. P. Seuntjens and P. N. Mobit. 2002 Madison, WI, Medical Physics Publishing.
  • Ma CM, Li JS, et al. A Monte Carlo dose calculation tool for radiotherapy treatment planning. Phys Med Biol. 2002 47(10):1671-89. PubMed
  • Li JS, Ma CM, et al. Source modeling and beam commissioning for photon beams from a Siemens accelerator. Med Phys. 2002;29(6):1230.
  • Fourkal E, Shahine B, et al. Particle in cell simulation of laser-accelerated proton beams for radiation therapy. Med Phys. 2002;29(12):2788-98. PubMed
  • Deng J, Lee MC, et al. A Monte Carlo investigation of fluence profiles collimated by an electron specific MLC during beam delivery for modulated electron radiation therapy. Med Phys. 2002;29(11):2472-83. PubMed
  • Chen L, Li JS, et al. Monte Carlo investigation of dosimetry accuracy of MR-based treatment planning. Med Phys. 2002;29:1339.
  • Blomquist M, Li J, et al. Comparison between a conventional treatment energy and 50 MV photons for the treatment of lung tumours. Phys Med Biol. 2002;47(6):889-97. PubMed
  • Lee MC, Deng J, Li JS, Jiang S, Ma, C-M. Monte Carlo based treatment planning for modulated electron beam radiation therapy. Phys Med Biol. 2001;46:2177-99 . PubMed
  • Miften M, Wiesmeyer M, Kapur A, Ma, C-M. Comparison of RTP dose distributions in heterogeneous phantoms with the BEAM Monte Carlo simulation system. J. Applied Clinical Med Phys. 2001;2:21-31. PubMed
  • Pawlicki T, and Ma CM. Monte Carlo dose modeling for MLC-based IMRT. Med Dosim 2001;26:157-168.
  • Pawlicki T, and Ma CM. Monte Carlo simulation for MLC-based intensity-modulated radiotherapy. Med Dosim. 2001;26(2):157-68. PubMed
  • Ma CM, Coffey CW, et al. AAPM protocol for 40-300 kV x-ray beam dosimetry in radiotherapy and radiobiology. Med Phys. 2001;28(6):868-93. PubMed
  • Li JS, Boyer Al, et al. Verification of IMRT dose distributions using a water beam imaging system. Med Phys. 2001;28(12):2466-74. PubMed
  • Jiang SB, Boyer Al, et al. Modeling the extrafocal radiation and monitor chamber backscatter for photon beam dose calculation. Med Phys. 2001;28(1):55-66. PubMed
  • Deng J, Pawlicki T, et al. The MLC tongue-and-groove effect on IMRT dose distributions. Phys Med Biol. 2001;46(4):1039-60. PubMed
  • Deng J, Jiang SB, et al. Derivation of electron and photon energy spectra from electron beam central axis depth dose curves. Phys Med Biol. 2001;46(5):1429-49. PubMed
  • Li JS, Pawlicki, T, Deng J, Jiang SB, Mok, E, Ma C-M. Validation of a Monte Carlo dose calculation tool for radiotherapy treatment planning. Phys Med Biol. 2000;45: 2969-85. PubMed
  • Ma CM, Pawlicki T, et al. Energy- and intensity-modulated electron beams for radiotherapy. Phys Med Biol. 2000;45(8):2293-311. PubMed
  • Ma CM, Pawlicki T, et al. Monte Carlo verification of IMRT dose distributions from a commercial treatment planning optimization system. Phys Med Biol. 2000;45(9):2483-95. PubMed
  • Li XA, L. Ma, et al. Monte Carlo dose verification for intensity modulated arc therapy. Int J Radiat Oncol Biol Phys. 2000;48(3S):216. PubMed
  • Lee MC and Ma CM. Monte Carlo characterization of clinical electron beams in transverse magnetic fields. Phys Med Biol. 2000;45(10):2947-67. PubMed
  • Lee MC, Jiang SB, et al. Monte Carlo and experimental investigations of multileaf collimated electron beams for modulated electron radiation therapy. Med Phys. 2000;27(12):2708-18. PubMed
  • Kapur A, Ma CM, et al. Monte Carlo simulation for multileaf-collimator leaves: Design and dosimetry. Med Phys. 2000;47:40.
  • Jiang SB, Pawlicki T, et al. Effect of statistical uncertainty on Monte Carlo calculated DVH. Phys Med Biol. 2000;45:2151-2161.
  • Jiang SB, Pawlicki T, et al. Removing the effect of statistical uncertainty on dose-volume histograms from Monte Carlo dose calculations. Phys Med Biol. 2000;45(8):2151-61. PubMed
  • Jiang SB, Kapur A, et al. Electron beam modeling and commissioning for Monte Carlo treatment planning. Med Phys. 2000;27(1):180-91. PubMed
  • Jiang SB, J. Deng, et al. Modeling and commissioning of clinical photon beam for Monte Carlo treatment planning. XIII Int Conference on the Use of Computers in Radiation Therapy. 2000 Heidelberg, Germany, Springer.
  • Deng J, Jiang SB, et al. Electron beam commissioning for Monte Carlo dose calculation. XIII ICCR. 2000 Heidelberg, Germany.
  • Deng J, Jiang SB, et al. Photon beam characterization and modelling for Monte Carlo treatment planning. Phys Med Biol. 2000;45(2):411-27. PubMed
  • Chen Y, Boyer Al, et al. Calculation of x-ray transmission through a multileaf collimator. Med Phys. 2000;27(8):1717-26. PubMed
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1990 - 1999

  • Ma L, Boyer Al, et al. Synchronizing dynamic multileaf collimators for producing two-dimensional intensity-modulated fields with minimum beam delivery time. Int J Radiat Oncol Biol Phys 1999;44(5):1147-54. PubMed
  • Xia P, Geis, P, Xing L, Ma C-M, Findley D, Forster K, Boyer AL. Physical characteristics of a miniature multileaf collimator. Med. Phys. 1999;26:65-70. PubMed
  • Ma CM and Seuntjens JP. Mass-energy absorption coefficient and backscatter factor ratios for kilovoltage x-ray beams. Phys Med Biol. 1999;44(1):131-43. PubMed
  • Ma CM, Mok E, et al. Clinical implementation of a Monte Carlo treatment planning system. Med Phys. 1999;26(10):2133-43.PubMed
  • Ma CM and Jiang SB. Monte Carlo modelling of electron beams from medical accelerators. Phys Med Biol. 1999;44(12):R157-89.PubMed
  • MG Karlsson, et al. Treatment head design for multileaf collimated high-energy electrons. Med Phys 1999;26(10):2161-7.PubMed
  • Kapur A and Ma CM. Stopping-power ratios for clinical electron beams from a scatter-foil linear accelerator. Phys Med Biol. 1999;44(9):2321-41. PubMed
  • Boyer A, Xing L, et al. Theoretical considerations of monitor unit calculations for intensity modulated beam treatment planning. Med Phys. 1999;26(2):187-95. PubMed
  • Ma L, Boyer Al, et al. Leaf synchronization methods of minimizing beam delivery time and improving beam output for intensity modulated fields. Med Phys. 1998;25(Abstract).
  • Ma L, Boyer Al, et al. An optimized leaf-setting algorithm for beam intensity modulation using dynamic multileaf collimators. Phys Med Biol. 1998;43(6):1629-43. PubMed
  • Ma CM, Li XA, et al. Study of dosimetry consistency for kilovoltage x-ray beams. Med Phys. 1998;25(12):2376-84. PubMed
  • Ma CM. Characteriation of radiotherapy beams for Monte Carlo treatment planning. Radiation Dosimetry and Chemistry. 1998;27:329-344.
  • Li XA, Ma CM, et al. Dosimetric evaluation of a widely used kilovoltage x-ray unit for endocavitary radiotherapy. Med Phys. 1998;25(8):1464-71. PubMed
  • Kapur A, Ma CM, et al. Monte Carlo calculations of electron beam output factors for a medical linear accelerator. Phys Med Biol. 1998;43(12):3479-94. PubMed
  • Ma CM and Seuntjens JP. Correction factors for water-proofing sleeves in kilovoltage x-ray beams. Med Phys. 19997;24(9):1507-13. PubMed
  • Ma CM, Mok E, et al. Monte Carlo treatment planning: Output factors for small irregular field electron beams. Med Phys. 1997;24:1049.
  • Ma CM, Mok E, et al. Improvement of small field electron beam dosimetry using Monte Carlo simulation. XII Int Conference on the Use of Computers in Radiation Therapy. 1997 Salt Lake City, UT.
  • Ma CM, Kapur A, et al. Monte Carlo treatment planning: Procedures for commissioning computer simulated clinical beams. J Int Federation for Med Biol Eng. 1997;35(Supplement Part 2):995.
  • Ma CM, Faddegon BA, et al. Accurate characterization of Monte Carlo calculated electron beams for radiotherapy. Med Phys. 1997;24(3):401-16. PubMed
  • Ma CM. Characterization of computer simulated clinical beams for Monte Carlo radiotherapy treatment planning. J Int Federation for Med Biol Eng. 1997;35(Supplement Part 2):1105.
  • Li XA, Salhani D, et al. Characteristics of orthovoltage x-ray therapy beams at extended SSD for applicators with end plates. Phys Med Biol. 1997;42(2):357-70. PubMed
  • Li XA, Ma CM, et al. Measurement of percentage depth dose and lateral beam profile for kilovoltage x-ray therapy beams. Phys Med Biol. 1997;42(12):2561-8. PubMed
  • Kapur A, Ma CM, et al. Characterization of small field electron beams for radiotherapy using Monte Carlo simulations. XII Int Conference on the Use of Computers in Radiation Therapy. 1997 Salt Lake City, UT.
  • Chartier JL, Grosswendt B, et al. Reference fluence-to-dose-equivalent conversion coefficients and angular-dependence factors for 4-element ICRU tissue, water and PMMA slab phantoms irradiated by broad electron beams. Radiat Protection Dosim. 1996;63:7-14.
  • Rogers DW, Ma CM, et al. (1995). BEAM Users Manual. National Research Council Report. Ottawa, Canada, National Reserach Council.
  • Ma CM and Rogers DW, (1995). Electron beam characterization: A multiple-source model. National Research Council Report. Ottawa, Canada, National Research Council.
  • Ma CM, Reckwerd P, et al. (1995). DOSXYZ Users Manual. National Research Council Report. Ottawa, Canada, National Research Council.
  • Ma CM and Nahum AE. Calculations of ion chamber displacement effect corrections for medium-energy x-ray dosimetry. Phys Med Biol. 1995;40(1): 45-62. PubMed
  • Ma CM and Nahum AE. Monte Carlo calculated stem effect correction for NE2561 and NE2571 chambers in medium-energy x-ray beams. Phys Med Biol. 1995;40(1): 63-72. PubMed
  • Ma CM and Nahum A. (1994). Plane-parallel chambers in electron beams: Monte Carlo findings on perturbation correction factor. Measurement Assurance in Dosimetry, IAEA-SM-330/71, Vienna.
  • Ma CM, Knight RT, et al. An investigation of the response of a simple design of plane-parallel chamber. Phys Med Biol. 1994;39(10):1593-608. PubMed
  • Ma CM, Knight RT, et al. Measurement of Ce factors for the NPL prototype plane-parallel chamber. Phys Med Biol. 1994;39:1593-1608.
  • Ma CM. Implementation of a Monte Carlo radiation transport code on a parallel computer system. Parallel Computing 1994;20:991-1005.
  • Ma CM (1994). Monte Carlo calculated correction factors for a NE2571 chember in medium-energy x-ray beams. Measurement Assurance in Dosimetry, IAEA-SM-330/5, Vienna.
  • Ma CM (1994). Theoretical and experimental investigation of the prototype NPL design of plane-parallel chambers. Measurement Assurance in Dosimetry, IAEA-SM-330/4, Vienna.
  • Ma CM, Rogers DW, et al. Wall-correction and absorbed-dose conversion factors for Fricke dosimetry: Monte Carlo calculations and measurements. Med Phys. 1993;20(2 Pt 1):283-92. PubMed
  • Ma CM, D. W. Rogers, et al. Simplified models of electron beams from a 2100C accelerator. Med Phys. 1993;20:1295.
  • Ma CM and Nahum AE. Dose conversion and wall correction factors for Fricke dosimetry in high-energy photon beams: analytical model and Monte Carlo calculations. Phys Med Biol. 1993;38(1):93-114. PubMed
  • Ma CM and Nahum AE. Calculation of absorbed dose ratios using correlated Monte Carlo sampling. Med Phys. 1993;20(4):1189-99. PubMed
  • Ma CM and A. Nahum. Correction factors for Fricke dosimetry in high-energy electron beams. Phys Med Biol. 1993;38:423-438.
  • Ma CM and A. Nahum. Effect of size and composition of central electrode on the response of cylindrical ionization chamber in high energy photon and electron beams. Phys Med Biol. 1993;38:267-293.
  • Ma CM and Nahum AE. A new algorithm for EGS4 low-energy electron transport to account for the change in electron discrete interaction cross-section with energy. Nucl Instr Meth. 1992;B72:319-330.
  • Ma CM and Nahum AE. Bragg-Gray theory and ion chamber dosimetry for photon beams. Phys Med Biol. 1991;36(4):413-28. PubMed
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1980 - 1989

  • Yang, G. G. and Ma CM, (1989). Political economics of international relations. Political economics of international relations. J. Gilpin. Beijing, Economics Press.
  • Ma CM and Smith R (1988). Theoretical and experimental research on super-resolution of microscopes: 1. Illumination and resolving power. SPIE 1028: Scanning Imaging.
  • Ma CM and Dong TH. Dong (1988). Effect of ametropia on laser interferometric visual acuity. SPIE 1013: Optical Design Methods, Applications, and Large Optics: 128-134.
  • Ma CM and Dai XQ (1988). Effect of grating positional error on Moire signal contrast. SPIE 1012: Process Optical Measurements.
  • Ma CM and Zhuang SL. Noise performance of temporally partial coherent signal processors. Acta Optica Sinica. 1987;7(Part II):385-393.
  • Ma CM and Dai XQ. Multi-circular grating ruling and short-periodic position error. Meters and Instruments 1987;5:212-218.
  • Ma CM and Dai XQ. Relation of Moire fringe contrast with the black-to-white ratio of gratings. Meters and Instruments 1986;4:151-159.
  • Ma CM and Dai XQ (1986). Subdivision of laser interferometric signals using microcomputers (in Chinese). Second National Conference on Precision Mechanical System and Its Element Designing, Shanghai, China.
  • Ma CM, Cheng WM, et al. Imaging of phase contrast microscopes under partially coherent illumination. Acta Optica Sinica 1986;6:129-136.
  • Ma CM (1986). Physiological Optics. Shanghai, Shanghai University of Schience and Technology Press.
  • Ma CM. A new way to ascertain conjugate vectors: Theparallel optimmization method. J of East China University of Technology 1985;5-1:89-97.
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