Lijun Ma, PhD
Professor Emeritus
Radiation Oncology
School of Medicine

Awards

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• Fellow, American Association of Physicists in Medicine, 2015

Websites

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• My Publications On Google (scholar.google.com)

Publications (98)

Top publication keywords:
Trigeminal NeuralgiaTumor BurdenParticle AcceleratorsRadiosurgerySpinal NeoplasmsRadiotherapy, ConformalRadiotherapy Planning, Computer-AssistedRadiometryAlgorithmsRadiotherapy, Intensity-ModulatedRadiation DosageRoboticsRadiation ProtectionBrain NeoplasmsRadiotherapy Dosage

• Feasibility and Significance of Dose Adaptation via Linear Couch Translations to Correct for Rotational Shifts During Frameless Brain Radiosurgery with the Gamma Knife Icon™.
  Acta neurochirurgica. Supplement 2021 Cheung JP, Morin O, Braunstein SE, Sneed PK, Theodosopoulos PV, McDermott MW, Ma L
• Impact of the Skull Size on the Normal Brain Radiation Dose During Gamma Knife Radiosurgery: Results of a Pilot Study.
  Acta neurochirurgica. Supplement 2021 Ma L, Fogh S, Braunstein SE, Auguste K, Theodosopoulos PV, McDermott MW, Sneed PK
• Possible Overcoming of Tumor Hypoxia with Adaptive Hypofractionated Radiosurgery of Large Brain Metastases: A Biological Modeling Study.
  Acta neurochirurgica. Supplement 2021 Ma L, Tseng CL, Sahgal A
• Redistributing Central Target Dose Hot Spots for Hypofractionated Radiosurgery of Large Brain Tumors: A Proof-of-Principle Study.
  Acta neurochirurgica. Supplement 2021 Ma L, Braunstein SE, Golden E, Fogh S, Nakamura J, McDermott MW, Sneed PK
• Attention-Aware Discrimination for MR-to-CT Image Translation Using Cycle-Consistent Generative Adversarial Networks.
  Radiology. Artificial intelligence 2020 Kearney V, Ziemer BP, Perry A, Wang T, Chan JW, Ma L, Morin O, Yom SS, Solberg TD

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• Stereotactic Radiosurgery to More Than 10 Brain Metastases: Evidence to Support the Role of Radiosurgery for Ideal Hippocampal Sparing in the Treatment of Multiple Brain Metastases.
  World neurosurgery 2019 Susko MS, Garcia MA, Ma L, Nakamura JL, Raleigh DR, Fogh S, Theodosopoulos P, McDermott M, Sneed PK, Braunstein SE
• Stereotactic radiosurgery for vestibular schwannomas.
  Cancer management and research 2018 Braunstein S, Ma L
• Resection Cavity Contraction Effects in the Use of Radioactive Sources (1-25 versus Cs-131) for Intra-Operative Brain Implants.
  Cureus 2018 Han DY, Ma L, Braunstein S, Raleigh D, Sneed PK, McDermott M
• Correlation between small-volume spinal cord doses for spine stereotactic body radiotherapy (SBRT).
  Journal of radiosurgery and SBRT 2018 Ma L, Wang L, Lee Y, Tseng CL, Soltys S, Braunstein S, Sahgal A
• Emerging technologies in stereotactic body radiotherapy.
  Chinese clinical oncology 2017 Ma L, Wang L, Tseng CL, Sahgal A
• Patient-Specific Fetal Dose Determination for Multi-Target Gamma Knife Radiosurgery: Computational Model and Case Report.
  Cureus 2017 Paulsson AK, Braunstein S, Phillips J, Theodosopoulos PV, McDermott M, Sneed PK, Ma L
• Dosimetric characterization of hypofractionated Gamma Knife radiosurgery of large or complex brain tumors versus linear accelerator-based treatments.
  Journal of neurosurgery 2016 Dong P, Pérez-Andújar A, Pinnaduwage D, Braunstein S, Theodosopoulos P, McDermott M, Sneed P, Ma L
• Sharpening peripheral dose gradient via beam number enhancement from patient head tilt for stereotactic brain radiosurgery.
  Physics in medicine and biology 2016 Chiu J, Pierce M, Braunstein SE, Theodosopoulos PV, McDermott MW, Sneed PK, Ma L
• Inherent functional dependence among cochlear dose surrogates for stereotactic radiosurgery of vestibular schwannomas.
  Practical radiation oncology 2016 Ma L, Braunstein SE, Theodosopoulos PV, McDermott MW, Sneed PK
• Estimating the probability of underdosing microscopic brain metastases with hippocampal-sparing whole-brain radiation.
  Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology 2016 Chang JS, Perez-Andujar A, Barani IJ, Ma L, Larson DA
• Minimizing normal tissue dose spillage via broad-range optimization of hundreds of intensity modulated beams for treating multiple brain targets.
  Journal of radiosurgery and SBRT 2016 Dong P, Hossain S, Keeling V, Ahmad S, Xing L, Ma L
• The era of stereotactic body radiotherapy for spinal metastases and the multidisciplinary management of complex cases.
  Neuro-oncology practice 2015 Kumar R, Nater A, Hashmi A, Myrehaug S, Lee Y, Ma L, Redmond K, Lo SS, Chang EL, Yee A, Fisher CG, Fehlings MG, Sahgal A
• Hippocampal Dose With Radiosurgery for Multiple Intracranial Targets: The Rationale for Proactive Beam Shaping.
  Technology in cancer research & treatment 2015 Chang JS, Ma L, Barani IJ, McDermott MW, Sneed PK, Larson DA
• Letter: volumetric arc therapy (RapidArc) vs Gamma Knife radiosurgery for multiple brain metastases.
  Neurosurgery 2015 Ma L, Sahgal A, Larson DA
• Clinical realization of sector beam intensity modulation for Gamma Knife radiosurgery: a pilot treatment planning study.
  International journal of radiation oncology, biology, physics 2014 Ma L, Mason E, Sneed PK, McDermott M, Polishchuk A, Larson DA, Sahgal A
• Impact of millimeter-level margins on peripheral normal brain sparing for gamma knife radiosurgery.
  International journal of radiation oncology, biology, physics 2014 Ma L, Sahgal A, Larson DA, Pinnaduwage D, Fogh S, Barani I, Nakamura J, McDermott M, Sneed P
• Variable dose interplay effects across radiosurgical apparatus in treating multiple brain metastases.
  International journal of computer assisted radiology and surgery 2014 Ma L, Nichol A, Hossain S, Wang B, Petti P, Vellani R, Higby C, Ahmad S, Barani I, Shrieve DC, Larson DA, Sahgal A
• Whole-procedural radiological accuracy for delivering multi-session gamma knife radiosurgery with a relocatable frame system.
  Technology in cancer research & treatment 2013 Ma L, Pinnaduwage D, McDermott M, Sneed PK
• Individual beam sharpening improves composite dose fall-off near a target for non-isocentric cyberknife radiosurgery.
  Technology in cancer research & treatment 2013 Wahl M, Hwang A, Nakamura J, Barani I, Fogh S, Sneed P, McDermott M, Sahgal A, Ma L
• High-precision volume-staged Gamma Knife surgery and equivalent hypofractionation dose schedules for treating large arteriovenous malformations.
  Journal of neurosurgery 2012 Fogh S, Ma L, Gupta N, Sahgal A, Nakamura JL, Barani I, Sneed PK, McDermott M, Larson DA
• Reliability of contour-based volume calculation for radiosurgery.
  Journal of neurosurgery 2012 Ma L, Sahgal A, Nie K, Hwang A, Karotki A, Wang B, Shrieve DC, Sneed PK, McDermott M, Larson DA
• Assessing small-volume spinal cord dose for repeat spinal stereotactic body radiotherapy treatments.
  Physics in medicine and biology 2012 Ma L, Kirby N, Korol R, Larson DA, Sahgal A
• Probabilities of radiation myelopathy specific to stereotactic body radiation therapy to guide safe practice.
  International journal of radiation oncology, biology, physics 2012 Sahgal A, Weinberg V, Ma L, Chang E, Chao S, Muacevic A, Gorgulho A, Soltys S, Gerszten PC, Ryu S, Angelov L, Gibbs I, Wong CS, Larson DA
• Comparison between prone and supine patient setup for spine stereotactic body radiosurgery.
  Technology in cancer research & treatment 2012 Descovich M, Ma L, Chuang CF, Larson DA, Barani IJ
• Cone beam CT (CBCT) evaluation of inter- and intra-fraction motion for patients undergoing brain radiotherapy immobilized using a commercial thermoplastic mask on a robotic couch.
  Technology in cancer research & treatment 2012 Lightstone AW, Tsao M, Baran PS, Chan G, Pang G, Ma L, Lochray F, Sahgal A
• Spine stereotactic body radiotherapy utilizing cone-beam CT image-guidance with a robotic couch: intrafraction motion analysis accounting for all six degrees of freedom.
  International journal of radiation oncology, biology, physics 2012 Hyde D, Lochray F, Korol R, Davidson M, Wong CS, Ma L, Sahgal A
• Impact of dose hot spots on spinal cord tolerance following stereotactic body radiotherapy: a generalized biological effective dose analysis.
  Technology in cancer research & treatment 2012 Sahgal A, Ma L, Fowler J, Weinberg V, Gibbs I, Gerszten PC, Ryu S, Soltys S, Chang E, Wong CS, Larson DA
• Advances in radiation therapy of brain metastasis.
  Progress in neurological surgery 2012 Lo SS, Sahgal A, Ma L, Chang EL
• A technique for achieving submillimeter accuracy of volume-staged stereotactic radiosurgery.
  Journal of radiosurgery and SBRT 2012 Ma L, Fogh S, Gupta N, Hwang A, Pinnaduwage D, Nakamura J, Barani I, McDermott M, Sneed PK, Larson DA, Sahgal A
• Stereotactic body radiotherapy is an effective treatment in reirradiating spinal metastases: current status and practical considerations for safe practice.
  Expert review of anticancer therapy 2011 Masucci GL, Yu E, Ma L, Chang EL, Letourneau D, Lo S, Leung E, Chao S, Hyde D, Gorgulho A, Muacevic A, Larson DA, Fehlings MG, Sahgal A
• Temporal compartmental dosing effects for robotic prostate stereotactic body radiotherapy.
  Physics in medicine and biology 2011 Shiao SL, Sahgal A, Hu W, Jabbari S, Chuang C, Descovich M, Hsu IC, Gottschalk AR, Roach M, Ma L
• Prognostic factors for survival in patients treated with stereotactic radiosurgery for recurrent brain metastases after prior whole brain radiotherapy.
  International journal of radiation oncology, biology, physics 2011 Caballero JA, Sneed PK, Lamborn KR, Ma L, Denduluri S, Nakamura JL, Barani IJ, McDermott MW
• Shot sequencing based on biological equivalent dose considerations for multiple isocenter Gamma Knife radiosurgery.
  Physics in medicine and biology 2011 Ma L, Lee L, Barani I, Hwang A, Fogh S, Nakamura J, McDermott M, Sneed P, Larson DA, Sahgal A
• A two-step optimization method for improving multiple brain lesion treatments with robotic radiosurgery.
  Technology in cancer research & treatment 2011 Ma L, Sahgal A, Hwang A, Hu W, Descovich M, Chuang C, Barani I, Sneed PK, McDermott M, Larson DA
• Apparatus dependence of normal brain tissue dose in stereotactic radiosurgery for multiple brain metastases.
  Journal of neurosurgery 2011 Ma L, Petti P, Wang B, Descovich M, Chuang C, Barani IJ, Kunwar S, Shrieve DC, Sahgal A, Larson DA
• Stereotactic body radiotherapy for spinal metastases: current status, with a focus on its application in the postoperative patient.
  Journal of neurosurgery. Spine 2010 Sahgal A, Bilsky M, Chang EL, Ma L, Yamada Y, Rhines LD, Létourneau D, Foote M, Yu E, Larson DA, Fehlings MG
• Stereotactic body radiotherapy as monotherapy or post-external beam radiotherapy boost for prostate cancer: technique, early toxicity, and PSA response.
  International journal of radiation oncology, biology, physics 2010 Jabbari S, Weinberg VK, Kaprealian T, Hsu IC, Ma L, Chuang C, Descovich M, Shiao S, Shinohara K, Roach M, Gottschalk AR
• A dosimetric comparison between Gamma Knife and CyberKnife treatment plans for trigeminal neuralgia.
  Journal of neurosurgery 2010 Descovich M, Sneed PK, Barbaro NM, McDermott MW, Chuang CF, Barani IJ, Nakamura JL, Lijun M
• Apparatus-dependent dosimetric differences in spine stereotactic body radiotherapy.
  Technology in cancer research & treatment 2010 Ma L, Sahgal A, Cozzi L, Chang E, Shiu A, Letourneau D, Yin FF, Fogliata A, Kaissl W, Hyde D, Laperriere NJ, Shrieve DC, Larson DA
• Reirradiation human spinal cord tolerance for stereotactic body radiotherapy.
  International journal of radiation oncology, biology, physics 2010 Sahgal A, Ma L, Weinberg V, Gibbs IC, Chao S, Chang UK, Werner-Wasik M, Angelov L, Chang EL, Sohn MJ, Soltys SG, Létourneau D, Ryu S, Gerszten PC, Fowler J, Wong CS, Larson DA
• Assessment of variation in Elekta plastic spherical-calibration phantom and its impact on the Leksell Gamma Knife calibration.
  Medical physics 2010 Novotny J, Bhatnagar JP, Chung HT, Johansson J, Bednarz G, Ma L, Huq MS
• Prescription dose guideline based on physical criterion for multiple metastatic brain tumors treated with stereotactic radiosurgery.
  International journal of radiation oncology, biology, physics 2010 Sahgal A, Barani IJ, Novotny J, Zhang B, Petti P, Larson DA, Ma L
• Equivalence in dose fall-off for isocentric and nonisocentric intracranial treatment modalities and its impact on dose fractionation schemes.
  International journal of radiation oncology, biology, physics 2010 Ma L, Sahgal A, Descovich M, Cho YB, Chuang C, Huang K, Laperriere NJ, Shrieve DC, Larson DA
• Dose gradient near target-normal structure interface for nonisocentric CyberKnife and isocentric intensity-modulated body radiotherapy for prostate cancer.
  International journal of radiation oncology, biology, physics 2010 Hossain S, Xia P, Huang K, Descovich M, Chuang C, Gottschalk AR, Roach M, Ma L
• Spinal cord tolerance for stereotactic body radiotherapy.
  International journal of radiation oncology, biology, physics 2009 Sahgal A, Ma L, Gibbs I, Gerszten PC, Ryu S, Soltys S, Weinberg V, Wong S, Chang E, Fowler J, Larson DA
• Task Group 142 report: quality assurance of medical accelerators.
  Medical physics 2009 Klein EE, Hanley J, Bayouth J, Yin FF, Simon W, Dresser S, Serago C, Aguirre F, Ma L, Arjomandy B, Liu C, Sandin C, Holmes T, Task Group 142, American Association of Physicists in Medicine
• Nonrandom intrafraction target motions and general strategy for correction of spine stereotactic body radiotherapy.
  International journal of radiation oncology, biology, physics 2009 Ma L, Sahgal A, Hossain S, Chuang C, Descovich M, Huang K, Gottschalk A, Larson DA
• Advances in technology for intracranial stereotactic radiosurgery.
  Technology in cancer research & treatment 2009 Sahgal A, Ma L, Chang E, Shiu A, Larson DA, Laperriere N, Yin FF, Tsao M, Menard C, Basran P, Létourneau D, Heydarian M, Beachey D, Shukla V, Cusimano M, Hodaie M, Zadeh G, Bernstein M, Schwartz M
• A simple and effective method for validation and measurement of collimator output factors for Leksell Gamma Knife Perfexion.
  Physics in medicine and biology 2009 Ma L, Kjäll P, Novotny J, Nordström H, Johansson J, Verhey L
• Dynamic delivery of IMRT using an independent collimator: a model study.
  Physics in medicine and biology 2009 Zhang Y, Hu Y, Ma L, Dai J
• Dynamic gamma knife radiosurgery.
  Physics in medicine and biology 2009 Luan S, Swanson N, Chen Z, Ma L
• Stereotactic body radiotherapy is effective salvage therapy for patients with prior radiation of spinal metastases.
  International journal of radiation oncology, biology, physics 2008 Sahgal A, Ames C, Chou D, Ma L, Huang K, Xu W, Chin C, Weinberg V, Chuang C, Weinstein P, Larson DA
• Effect of composite sector collimation on average dose fall-off for Gamma Knife Perfexion.
  Journal of neurosurgery 2008 Ma L, Verhey L, Chuang C, Descovich M, Smith V, Huang K, McDermott M, Sneed P
• Whole-procedure clinical accuracy of gamma knife treatments of large lesions.
  Medical physics 2008 Ma L, Chuang C, Descovich M, Petti P, Smith V, Verhey L
• Intrafractional motion of the prostate during hypofractionated radiotherapy.
  International journal of radiation oncology, biology, physics 2008 Xie Y, Djajaputra D, King CR, Hossain S, Ma L, Xing L
• Simulated real time image guided intrafraction tracking-delivery for hypofractionated prostate IMRT.
  Medical physics 2008 Hossain S, Xia P, Chuang C, Verhey L, Gottschalk AR, Mu G, Ma L
• Split-volume treatment planning of multiple consecutive vertebral body metastases for cyberknife image-guided robotic radiosurgery.
  Medical dosimetry : official journal of the American Association of Medical Dosimetrists 2008 Sahgal A, Chuang C, Larson D, Huang K, Petti P, Weinstein P, Ma L
• Effects of residual target motion for image-tracked spine radiosurgery.
  Medical physics 2007 Chuang C, Sahgal A, Lee L, Larson D, Huang K, Petti P, Verhey L, Ma L
• Boosting central target dose by optimizing embedded dose hot spots for gamma knife radiosurgery.
  Stereotactic and functional neurosurgery 2007 Ma L, Larson D, Petti P, Chuang C, Verhey L
• Treatments of exceptionally large prostate cancer patients with low-energy intensity-modulated photons.
  Journal of applied clinical medical physics 2006 Sun M, Ma L
• Concomitant GRID boost for Gamma Knife radiosurgery.
  Medical physics 2005 Ma L, Kwok Y, Chin LS, Simard JM, Regine WF
• A constrained tracking algorithm to optimize plug patterns in multiple isocenter gamma knife radiosurgery planning.
  Medical physics 2005 Li K, Ma L
• Simultaneous integrated intensity-modulated radiotherapy boost for locally advanced gynecological cancer: radiobiological and dosimetric considerations.
  International journal of radiation oncology, biology, physics 2005 Guerrero M, Li XA, Ma L, Linder J, Deyoung C, Erickson B
• Dosimetric properties of magnetically collimated electron beams for radiation therapy.
  Medical physics 2004 Ma L
• Selective source blocking for Gamma Knife radiosurgery of trigeminal neuralgia based on analytical dose modelling.
  Physics in medicine and biology 2004 Li K, Ma L
• Improving a scissor-action couch for conformal arc radiotherapy and radiosurgery.
  Journal of applied clinical medical physics 2004 Li K, Yu CX, Ma L
• Simultaneous minimizing monitor units and number of segments without leaf end abutment for segmental intensity modulated radiation therapy delivery.
  Medical physics 2004 Li K, Dai J, Ma L
• Magnetic collimation and metal foil filtering for electron range and fluence modulation.
  Medical physics 2004 Phaisangittisakul N, D'Souza WD, Ma L
• A quality assurance method for analyzing and verifying intensity modulated fields.
  Medical physics 2003 Ma L, Phaisangittisakul N, Yu CX, Sarfaraz M
• Concomitant boost of stratified target area with gamma knife radiosurgery: a treatment planning study.
  American journal of clinical oncology 2003 Ma L, Chin LS, DiBiase SJ, Gullapalli R, Kennedy A, Simard JM, Slawson R
• A technique to sharpen the beam penumbra for Gamma Knife radiosurgery.
  Physics in medicine and biology 2003 Guerrero M, Li XA, Ma L
• Smoothing intensity-modulated treatment delivery under hardware constraints.
  Medical physics 2002 Ma L
• An empirical model for independent dose verification of the Gamma Knife treatment planning.
  Medical physics 2002 Phaisangittisakul N, Ma L
• Clinical implementation of intensity-modulated arc therapy.
  International journal of radiation oncology, biology, physics 2002 Yu CX, Li XA, Ma L, Chen D, Naqvi S, Shepard D, Sarfaraz M, Holmes TW, Suntharalingam M, Mansfield CM
• Influence of gamma knife radiosurgery on the quality of life in patients with brain metastases.
  American journal of clinical oncology 2002 DiBiase SJ, Chin LS, Ma L
• Optimized intensity-modulated arc therapy for prostate cancer treatment.
  International journal of cancer 2001 Ma L, Yu CX, Earl M, Holmes T, Sarfaraz M, Li XA, Shepard D, Amin P, DiBiase S, Suntharalingam M, Mansfield C
• Dependence of normal brain integral dose and normal tissue complication probability on the prescription isodose values for gamma-knife radiosurgery.
  Physics in medicine and biology 2001 Ma L
• Monte Carlo dose verification for intensity-modulated arc therapy.
  Physics in medicine and biology 2001 Li XA, Ma L, Naqvi S, Shih R, Yu C
• Radiation necrosis following gamma knife surgery: a case-controlled comparison of treatment parameters and long-term clinical follow up.
  Journal of neurosurgery 2001 Chin LS, Ma L, DiBiase S
• Inverse treatment planning for Gamma Knife radiosurgery.
  Medical physics 2000 Shepard DM, Ferris MC, Ove R, Ma L
• Monte Carlo verification of IMRT dose distributions from a commercial treatment planning optimization system.
  Physics in medicine and biology 2000 Ma CM, Pawlicki T, Jiang SB, Li JS, Deng J, Mok E, Kapur A, Xing L, Ma L, Boyer AL
• Dosimetric effects of patient displacement and collimator and gantry angle misalignment on intensity modulated radiation therapy.
  Radiotherapy and oncology : journal of the European Society for Therapeutic Radiology and Oncology 2000 Xing L, Lin Z, Donaldson SS, Le QT, Tate D, Goffinet DR, Wolden S, Ma L, Boyer AL
• A dosimetric leaf-setting strategy for shaping radiation fields using a multileaf collimator.
  Medical physics 2000 Ma L, Yu C, Sarfaraz M
• The effect of user-defined variables on dosimetry consistency in Gamma Knife planning.
  Physics in medicine and biology 2000 Ma L, Chin LS, Shepard D, Amin P, Slawson R
• An efficient method of measuring the 4 mm helmet output factor for the Gamma knife.
  Physics in medicine and biology 2000 Ma L, Li XA, Yu CX
• An investigation of eye lens dose for gamma knife treatments of trigeminal neuralgia.
  Journal of applied clinical medical physics 2000 Ma L, Chin L, Sarfaraz M, Shepard D, Yu C
• A dosimetric comparison of fan-beam intensity modulated radiotherapy with Gamma Knife stereotactic radiosurgery for treating intermediate intracranial lesions.
  International journal of radiation oncology, biology, physics 1999 Ma L, Xia P, Verhey LJ, Boyer AL
• Synchronizing dynamic multileaf collimators for producing two-dimensional intensity-modulated fields with minimum beam delivery time.
  International journal of radiation oncology, biology, physics 1999 Ma L, Boyer AL, Ma CM, Xing L
• Dosimetric verification of a commercial inverse treatment planning system.
  Physics in medicine and biology 1999 Xing L, Curran B, Hill R, Holmes T, Ma L, Forster KM, Boyer AL
• Application of a video-optical beam imaging system for quality assurance of medical accelerators.
  Physics in medicine and biology 1998 Ma L, Boyer AL, Findley DO, Geis PB, Mok E
• An optimized leaf-setting algorithm for beam intensity modulation using dynamic multileaf collimators.
  Physics in medicine and biology 1998 Ma L, Boyer AL, Xing L, Ma CM
• Using static MLC fields to replace partial transmission cerrobend blocks in treatment planning of rectal carcinoma cases.
  Medical dosimetry : official journal of the American Association of Medical Dosimetrists 1998 Ma L, Chang W, Lau-Chin M, Tate EM, Boyer AL
• Quality assurance for dynamic multileaf collimator modulated fields using a fast beam imaging system.
  Medical physics 1997 Ma L, Geis PB, Boyer AL