Ricky O’Brien

3.7k total citations · 1 hit paper
114 papers, 2.8k citations indexed

About

Ricky O’Brien is a scholar working on Radiation, Radiology, Nuclear Medicine and Imaging and Pulmonary and Respiratory Medicine. According to data from OpenAlex, Ricky O’Brien has authored 114 papers receiving a total of 2.8k indexed citations (citations by other indexed papers that have themselves been cited), including 87 papers in Radiation, 83 papers in Radiology, Nuclear Medicine and Imaging and 50 papers in Pulmonary and Respiratory Medicine. Recurrent topics in Ricky O’Brien's work include Advanced Radiotherapy Techniques (87 papers), Medical Imaging Techniques and Applications (66 papers) and Radiation Therapy and Dosimetry (33 papers). Ricky O’Brien is often cited by papers focused on Advanced Radiotherapy Techniques (87 papers), Medical Imaging Techniques and Applications (66 papers) and Radiation Therapy and Dosimetry (33 papers). Ricky O’Brien collaborates with scholars based in Australia, Denmark and United States. Ricky O’Brien's co-authors include Paul Keall, John B. Bass, Frederick L. Ruben, Laurence S. Farer, Philip C. Hopewell, George F. Thornton, R. F. Jacobs, Dixie E. Snider, Jeremy Booth and P.R. Poulsen and has published in prestigious journals such as New England Journal of Medicine, Journal of Biological Chemistry and Neurology.

In The Last Decade

Ricky O’Brien

109 papers receiving 2.7k citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Treatment of Tuberculosis and Tuberculosis Infection in Adults and Children. American Thoracic Society and the Centers for Disease Control and Prevention

1994 885 citations John B. Bass, Laurence S. Farer et al. American Journal of Respiratory and Critical Care Medicine profile →

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Ricky O’Brien Australia	26	1.4k	1.3k	878	643	507	114	2.8k
Sauli Savolainen Finland	30	688 0.5×	1.6k 1.2×	573 0.7×	250 0.4×	407 0.8×	163	3.2k
Frank Hulstaert Belgium	30	201 0.1×	330 0.3×	333 0.4×	381 0.6×	791 1.6×	108	3.6k
Philip Wong Canada	29	471 0.3×	309 0.2×	224 0.3×	235 0.4×	2.2k 4.4×	128	3.9k
Mark Hurwitz United States	31	481 0.4×	477 0.4×	1.3k 1.5×	32 0.0×	162 0.3×	127	2.7k
Gerhard W. Sybrecht Germany	29	188 0.1×	653 0.5×	1.6k 1.8×	145 0.2×	298 0.6×	66	2.8k
John J. Kim United States	22	782 0.6×	440 0.3×	782 0.9×	36 0.1×	463 0.9×	55	2.5k
Susumu Kanazawa Japan	40	447 0.3×	1.3k 1.0×	3.7k 4.2×	43 0.1×	403 0.8×	317	6.3k
Robert H. Reid United States	23	171 0.1×	746 0.6×	604 0.7×	113 0.2×	219 0.4×	84	2.0k
Christopher Werlein Germany	14	129 0.1×	282 0.2×	737 0.8×	2.6k 4.0×	391 0.8×	50	4.1k
Claus Peter Heußel Germany	51	117 0.1×	2.0k 1.5×	4.7k 5.3×	1.4k 2.1×	1.8k 3.5×	336	8.4k

Countries citing papers authored by Ricky O’Brien

Since Specialization

Citations

This map shows the geographic impact of Ricky O’Brien'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 Ricky O’Brien with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites Ricky O’Brien more than expected).

Fields of papers citing papers by Ricky O’Brien

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by Ricky O’Brien. 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 Ricky O’Brien. The network helps show where Ricky O’Brien may publish in the future.

Co-authorship network of co-authors of Ricky O’Brien

This figure shows the co-authorship network connecting the top 25 collaborators of Ricky O’Brien. A scholar is included among the top collaborators of Ricky O’Brien 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 Ricky O’Brien. Ricky O’Brien is excluded from the visualization to improve readability, since they are connected to all nodes in the network.

All Works

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20 of 20 papers shown

Byrne, Hilary L., et al.. (2024). Data-driven rapid 4D cone-beam CT reconstruction for new generation linacs. Physics in Medicine and Biology. 69(18). 18NT02–18NT02. 1 indexed citations

Byrne, Hilary L., et al.. (2023). Thoracic motion‐compensated cone‐beam computed tomography in under 20 seconds on a fast‐rotating linac: A simulation study. Journal of Applied Clinical Medical Physics. 24(3). e13909–e13909. 4 indexed citations

Reynolds, Tess, et al.. (2023). Technical note: Extended longitudinal and lateral 3D imaging with a continuous dual‐isocenter CBCT scan. Medical Physics. 50(4). 2372–2379. 3 indexed citations

Lau, Benjamin K., et al.. (2023). Faster and lower dose imaging: evaluating adaptive, constant gantry velocity and angular separation in fast low‐dose 4D cone beam CT imaging. Medical Physics. 51(2). 1364–1382. 1 indexed citations

Liu, Paul Z. Y., et al.. (2021). Pre-treatment and real-time image guidance for a fixed-beam radiotherapy system. Physics in Medicine and Biology. 66(6). 64003–64003.

Shieh, Chun‐Chien, Ricky O’Brien, Verity Ahern, et al.. (2021). The adaptation and investigation of cone-beam CT reconstruction algorithms for horizontal rotation fixed-gantry scans of rabbits. Physics in Medicine and Biology. 66(10). 105012–105012. 2 indexed citations

Nguyen, Doan Trang, T. B. Moodie, Ricky O’Brien, et al.. (2021). Study protocol of the LARK (TROG 17.03) clinical trial: a phase II trial investigating the dosimetric impact of Liver Ablative Radiotherapy using Kilovoltage intrafraction monitoring. BMC Cancer. 21(1). 494–494. 5 indexed citations

O’Brien, Ricky, Benjamin K. Lau, Andrew Wallis, et al.. (2021). The first-in-human implementation of adaptive 4D cone beam CT for lung cancer radiotherapy: 4DCBCT in less time with less dose. Radiotherapy and Oncology. 161. 29–34. 11 indexed citations

Keall, Paul, et al.. (2020). Evaluating reconstruction algorithms for respiratory motion guided acquisition. Physics in Medicine and Biology. 65(17). 175009–175009. 15 indexed citations

10.

Reynolds, Tess, Chun‐Chien Shieh, Paul Keall, & Ricky O’Brien. (2019). Towards patient connected imaging with ACROBEAT: Adaptive CaRdiac cOne BEAm computed Tomography. Physics in Medicine and Biology. 64(6). 65006–65006. 3 indexed citations

11.

O’Brien, Ricky, et al.. (2019). Real-time respiratory triggered four dimensional cone-beam CT halves imaging dose compared to conventional 4D CBCT. Physics in Medicine and Biology. 64(7). 07NT01–07NT01. 4 indexed citations

12.

Kyme, André, Vincent Caillet, Doan Trang Nguyen, et al.. (2019). A six-degree-of-freedom robotic motion system for quality assurance of real-time image-guided radiotherapy. Physics in Medicine and Biology. 64(10). 105021–105021. 12 indexed citations

13.

Keall, Paul, Doan Trang Nguyen, Ricky O’Brien, et al.. (2018). Review of Real-Time 3-Dimensional Image Guided Radiation Therapy on Standard-Equipped Cancer Radiation Therapy Systems: Are We at the Tipping Point for the Era of Real-Time Radiation Therapy?. International Journal of Radiation Oncology*Biology*Physics. 102(4). 922–931. 46 indexed citations

14.

O’Brien, Ricky, et al.. (2017). Reducing 4DCBCT imaging time and dose: the first implementation of variable gantry speed 4DCBCT on a linear accelerator. Physics in Medicine and Biology. 62(11). 4300–4317. 12 indexed citations

15.

Nguyen, Doan Trang, Jenny Bertholet, Ricky O’Brien, et al.. (2017). An interdimensional correlation framework for real-time estimation of six degree of freedom target motion using a single x-ray imager during radiotherapy. Physics in Medicine and Biology. 63(1). 15010–15010. 6 indexed citations

16.

Colvill, Emma, P.R. Poulsen, Jeremy Booth, et al.. (2014). DMLC tracking and gating can improve dose coverage for prostate VMAT. Medical Physics. 41(9). 91705–91705. 42 indexed citations

17.

O’Brien, Ricky, et al.. (2013). Optimizing 4D cone beam computed tomography acquisition by varying the gantry velocity and projection time interval. Physics in Medicine and Biology. 58(6). 1705–1723. 31 indexed citations

18.

Edginton, M. E., et al.. (2013). Research ethics in The Union: an 8-year review of the Ethics Advisory Group. Public Health Action. 3(4). 346–350. 3 indexed citations

19.

Holloway, Paul, Kenneth S. Knox, Nicholas J. White, et al.. (1995). Plasmodium berghei Infection: Dichloroacetate Improves Survival in Rats with Lactic Acidosis. Experimental Parasitology. 80(4). 624–632. 16 indexed citations

20.

Bass, John B., Laurence S. Farer, Philip C. Hopewell, et al.. (1994). Treatment of Tuberculosis and Tuberculosis Infection in Adults and Children. American Thoracic Society and the Centers for Disease Control and Prevention. American Journal of Respiratory and Critical Care Medicine. 149(5). 1359–1374. 885 indexed citations breakdown →

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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