Roy Ma

1.9k total citations
32 papers, 1.5k citations indexed

About

Roy Ma is a scholar working on Epidemiology, Genetics and Neurology. According to data from OpenAlex, Roy Ma has authored 32 papers receiving a total of 1.5k indexed citations (citations by other indexed papers that have themselves been cited), including 16 papers in Epidemiology, 10 papers in Genetics and 8 papers in Neurology. Recurrent topics in Roy Ma's work include Meningioma and schwannoma management (14 papers), Glioma Diagnosis and Treatment (10 papers) and Brain Metastases and Treatment (6 papers). Roy Ma is often cited by papers focused on Meningioma and schwannoma management (14 papers), Glioma Diagnosis and Treatment (10 papers) and Brain Metastases and Treatment (6 papers). Roy Ma collaborates with scholars based in Canada, United States and Denmark. Roy Ma's co-authors include Gregory E. Miller, Teresa J. Marin, Steve W. Cole, Jesusa M.G. Arevalo, Richard Doll, Edith Chen, Nicolas Rohleder, Michael McKenzie, Brian Toyota and Alan Nichol and has published in prestigious journals such as Journal of Clinical Oncology, Biological Psychiatry and Journal of neurosurgery.

In The Last Decade

Roy Ma

31 papers receiving 1.4k citations

Peers — A (Enhanced Table)

Peers by citation overlap · career bar shows stage (early→late) cites · hero ref

Name h Career Trend Papers Cites
Roy Ma Canada 18 393 307 276 235 232 32 1.5k
Elizabeth Wells United States 22 85 0.2× 206 0.7× 18 0.1× 379 1.6× 281 1.2× 49 2.8k
Isabella Zwiener Germany 30 29 0.1× 493 1.6× 30 0.1× 428 1.8× 312 1.3× 77 2.9k
Najib Aziz United States 6 165 0.4× 48 0.2× 154 0.6× 19 0.1× 354 1.5× 8 1.1k
Dana Erickson United States 28 64 0.2× 509 1.7× 14 0.1× 250 1.1× 140 0.6× 116 3.2k
Alan Valentine United States 19 217 0.6× 331 1.1× 400 1.4× 73 0.3× 443 1.9× 38 1.7k
Lori J. Bernstein Canada 24 22 0.1× 62 0.2× 51 0.2× 53 0.2× 824 3.6× 65 2.3k
Arthur R. Van Gool Netherlands 26 115 0.3× 150 0.5× 303 1.1× 39 0.2× 180 0.8× 71 2.1k
Muhammad Omair Husain Canada 18 77 0.2× 397 1.3× 163 0.6× 299 1.3× 125 0.5× 60 1.3k
Tobias Walbert United States 23 29 0.1× 192 0.6× 10 0.0× 126 0.5× 330 1.4× 102 1.5k
A. J. Douglas United Kingdom 19 163 0.4× 88 0.3× 9 0.0× 44 0.2× 254 1.1× 28 1.5k

Countries citing papers authored by Roy Ma

Since Specialization
Citations

This map shows the geographic impact of Roy Ma's research. It shows the number of citations coming from papers published by authors working in each country. You can also color the map by specialization and compare the number of citations received by Roy Ma with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Roy Ma more than expected).

Fields of papers citing papers by Roy Ma

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Roy Ma. Nodes represent research fields, and links connect fields that are likely to share authors. Colored nodes show fields that tend to cite the papers produced by Roy Ma. The network helps show where Roy Ma may publish in the future.

Co-authorship network of co-authors of Roy Ma

This figure shows the co-authorship network connecting the top 25 collaborators of Roy Ma. A scholar is included among the top collaborators of Roy Ma based on the total number of citations received by their joint publications. Widths of edges represent the number of papers authors have co-authored together. Node borders signify the number of papers an author published with Roy Ma. Roy Ma is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

20 of 20 papers shown
1.
Li, Jim Zhang Hao, Andrew Lee, Serge Makarenko, et al.. (2025). Population-Based Real-World Outcomes of Post-Operative Adjuvant Brain Cavity Radiotherapy Versus Observation. Current Oncology. 32(6). 345–345.
2.
Luchka, K., et al.. (2023). In‐vivo quality assurance of dynamic tumor tracking (DTT) for liver SABR using EPID images. Journal of Applied Clinical Medical Physics. 24(7). e13969–e13969. 1 indexed citations
3.
Thomas, S., et al.. (2023). Markerless dynamic tumor tracking (MDTT) radiotherapy using diaphragm as a surrogate for liver targets. Journal of Applied Clinical Medical Physics. 25(2). e14161–e14161. 3 indexed citations
4.
Chan, Matthew, David W. Ferguson, Ren Yuan, et al.. (2020). Patients with pretreatment leukoencephalopathy and older patients have more cognitive decline after whole brain radiotherapy. Radiation Oncology. 15(1). 271–271. 5 indexed citations
5.
Lo, Andrea, G. Ayre, Roy Ma, et al.. (2017). Population-Based Study of Stereotactic Radiosurgery or Fractionated Stereotactic Radiation Therapy for Vestibular Schwannoma: Long-Term Outcomes and Toxicities. International Journal of Radiation Oncology*Biology*Physics. 100(2). 443–451. 17 indexed citations
6.
Nichol, Alan, Roy Ma, Fred Hsu, et al.. (2015). Volumetric Radiosurgery for 1 to 10 Brain Metastases: A Multicenter, Single-Arm, Phase 2 Study. International Journal of Radiation Oncology*Biology*Physics. 94(2). 312–321. 40 indexed citations
7.
Loewen, Shaun, E. Vollans, Mitchell Liu, et al.. (2015). Liver dosimetric evaluation in biologically based stereotactic body radiotherapy for large inoperable hepatocellular carcinoma. Journal of Radiation Oncology. 4(2). 177–184. 2 indexed citations
8.
Weber, Britta, Katherine Paton, Roy Ma, & Tom Pickles. (2015). Outcomes of Proton Beam Radiotherapy for Large Non-Peripapillary Choroidal and Ciliary Body Melanoma at TRIUMF and the BC Cancer Agency. Ocular Oncology and Pathology. 2(1). 29–35. 20 indexed citations
9.
Shams, Pari N., Roy Ma, Tom Pickles, Jack Rootman, & Peter J. Dolman. (2014). Reduced Risk of Compressive Optic Neuropathy Using Orbital Radiotherapy in Patients With Active Thyroid Eye Disease. American Journal of Ophthalmology. 157(6). 1299–1305. 55 indexed citations
10.
Miller, Gregory E., Michael Murphy, Rosemary Cashman, et al.. (2014). Greater inflammatory activity and blunted glucocorticoid signaling in monocytes of chronically stressed caregivers. Brain Behavior and Immunity. 41. 191–199. 140 indexed citations
11.
Ma, Roy, Ryojo Akagami, Michael McKenzie, et al.. (2013). Long-Term Outcomes of Fractionated Stereotactic Radiation Therapy for Pituitary Adenomas at the BC Cancer Agency. International Journal of Radiation Oncology*Biology*Physics. 87(3). 528–533. 25 indexed citations
12.
Hsu, Fred, Sonia Nguyen, Arthur Cheung, et al.. (2013). Population-based outcomes of boost versus salvage radiosurgery for brain metastases after whole brain radiotherapy. Radiotherapy and Oncology. 108(1). 128–131. 8 indexed citations
13.
Tran, Eric, Roy Ma, Katherine Paton, E. W. Blackmore, & Tom Pickles. (2011). Outcomes of Proton Radiation Therapy for Peripapillary Choroidal Melanoma at the BC Cancer Agency. International Journal of Radiation Oncology*Biology*Physics. 83(5). 1425–1431. 30 indexed citations
14.
Shaffer, Richard, Alan Nichol, E. Vollans, et al.. (2009). A Comparison of Volumetric Modulated Arc Therapy and Conventional Intensity-Modulated Radiotherapy for Frontal and Temporal High-Grade Gliomas. International Journal of Radiation Oncology*Biology*Physics. 76(4). 1177–1184. 118 indexed citations
15.
Campbell, Belinda A., Ashu Jhamb, John A. Maguire, Brian Toyota, & Roy Ma. (2009). Meningiomas in 2009. American Journal of Clinical Oncology. 32(1). 73–85. 74 indexed citations
16.
Clark, Brenda, E. Vollans, Ermias Gete, et al.. (2008). Optimization of Stereotactic Radiotherapy Treatment Delivery Technique for Base-Of-Skull Meningiomas. Medical dosimetry. 33(3). 239–247. 15 indexed citations
17.
Miller, Gregory E., Edith Chen, Teresa J. Marin, et al.. (2008). A Functional Genomic Fingerprint of Chronic Stress in Humans: Blunted Glucocorticoid and Increased NF-κB Signaling. Biological Psychiatry. 64(4). 266–272. 448 indexed citations
18.
Clark, Brenda, Michael McKenzie, James L. Robar, et al.. (2007). Does Intensity Modulation Improve Healthy Tissue Sparing in Stereotactic Radiosurgery of Complex Arteriovenous Malformations?. Medical dosimetry. 32(3). 172–180. 8 indexed citations
19.
Chung, Hans T., Roy Ma, Brian Toyota, et al.. (2004). Audiologic and treatment outcomes after linear accelerator–based stereotactic irradiation for acoustic neuroma. International Journal of Radiation Oncology*Biology*Physics. 59(4). 1116–1121. 46 indexed citations
20.
Tankel, Keith, et al.. (2002). Short-course preoperative radiation therapy for operable rectal cancer. The American Journal of Surgery. 183(5). 509–511. 6 indexed citations

Rankless uses publication and citation data sourced from OpenAlex, an open and comprehensive bibliographic database. While OpenAlex provides broad and valuable coverage of the global research landscape, it—like all bibliographic datasets—has inherent limitations. These include incomplete records, variations in author disambiguation, differences in journal indexing, and delays in data updates. As a result, some metrics and network relationships displayed in Rankless may not fully capture the entirety of a scholar's output or impact.

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