John Ryan

976 total citations
52 papers, 616 citations indexed

About

John Ryan is a scholar working on Radiology, Nuclear Medicine and Imaging, Pulmonary and Respiratory Medicine and Pediatrics, Perinatology and Child Health. According to data from OpenAlex, John Ryan has authored 52 papers receiving a total of 616 indexed citations (citations by other indexed papers that have themselves been cited), including 19 papers in Radiology, Nuclear Medicine and Imaging, 15 papers in Pulmonary and Respiratory Medicine and 7 papers in Pediatrics, Perinatology and Child Health. Recurrent topics in John Ryan's work include Radiology practices and education (11 papers), Digital Radiography and Breast Imaging (8 papers) and Algebraic and Geometric Analysis (7 papers). John Ryan is often cited by papers focused on Radiology practices and education (11 papers), Digital Radiography and Breast Imaging (8 papers) and Algebraic and Geometric Analysis (7 papers). John Ryan collaborates with scholars based in Ireland, Australia and United States. John Ryan's co-authors include Michael G. Evanoff, Patrick Brennan, Mark F. McEntee, J.P. McNulty, Louise Rainford, Fionnuala M. McAuliffe, Shane Foley, Dev P. Chakraborty, Warren Reed and David Manning and has published in prestigious journals such as Radiology, American Journal of Roentgenology and Heart.

In The Last Decade

John Ryan

49 papers receiving 579 citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
John Ryan Ireland 15 206 140 88 70 67 52 616
Braden Goddard United States 12 137 0.7× 105 0.8× 47 0.5× 14 0.2× 28 0.4× 63 628
B.J. Oosterveld Netherlands 13 428 2.1× 49 0.3× 283 3.2× 63 0.9× 27 0.4× 28 723
Wim Vos Belgium 29 354 1.7× 1.4k 10.2× 179 2.0× 61 0.9× 62 0.9× 98 2.1k
Gregg Tracton United States 13 325 1.6× 188 1.3× 141 1.6× 76 1.1× 42 0.6× 51 825
Shu-Jen Yeh Taiwan 15 92 0.4× 215 1.5× 136 1.5× 4 0.1× 20 0.3× 30 900
M. Demi Italy 19 433 2.1× 512 3.7× 213 2.4× 21 0.3× 9 0.1× 66 1.3k
Rafal Kustra Canada 17 137 0.7× 85 0.6× 23 0.3× 42 0.6× 74 1.1× 33 909
Shinjini Kundu United States 11 153 0.7× 139 1.0× 46 0.5× 173 2.5× 19 0.3× 19 690
Sasank Chilamkurthy United States 4 268 1.3× 69 0.5× 128 1.5× 184 2.6× 24 0.4× 6 663
Jun Guo China 17 182 0.9× 197 1.4× 56 0.6× 48 0.7× 104 1.6× 103 987

Countries citing papers authored by John Ryan

Since Specialization
Citations

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

Fields of papers citing papers by John Ryan

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

This network shows the impact of papers produced by John Ryan. 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 John Ryan. The network helps show where John Ryan may publish in the future.

Co-authorship network of co-authors of John Ryan

This figure shows the co-authorship network connecting the top 25 collaborators of John Ryan. A scholar is included among the top collaborators of John Ryan 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 John Ryan. John Ryan 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.
Chen, Lihua, et al.. (2023). Debias random forest regression predictors. 56(2). 115–131. 2 indexed citations
2.
Ryan, John, Masao Nakayama, Moshi Geso, et al.. (2022). Functional brain imaging interventions for radiation therapy planning in patients with glioblastoma: a systematic review. Radiation Oncology. 17(1). 178–178. 6 indexed citations
3.
Ryan, John, et al.. (2019). Variability of Breast Density Classification Between US and UK Radiologists. Journal of medical imaging and radiation sciences. 50(1). 53–61. 14 indexed citations
4.
5.
O’Connor, Michelle, John Ryan, & Shane Foley. (2015). A review of cross-sectional imaging, ultrasound and nuclear medicine utilization patterns in paediatric patients in Ireland, 2003–12. British Journal of Radiology. 88(1048). 20140767–20140767. 6 indexed citations
6.
McNulty, J.P., Róisín Lonergan, Patrick Brennan, et al.. (2014). Diagnostic Efficacy of Conventional MRI Pulse Sequences in the Detection of Lesions Causing Internuclear Ophthalmoplegia in Multiple Sclerosis Patients. Clinical Neuroradiology. 25(3). 233–239. 6 indexed citations
7.
Li, Junxia & John Ryan. (2014). Plemelj Formulas for Rarita-Schwinger Type Operators. Advances in Applied Clifford Algebras. 24(4). 1093–1104.
8.
Chakraborty, Dev P., Tamara Miner Haygood, John Ryan, et al.. (2012). Quantifying the clinical relevance of a laboratory observer performance paradigm. British Journal of Radiology. 85(1017). 1287–1302. 4 indexed citations
9.
Robinson, John, John Ryan, Mark F. McEntee, et al.. (2012). Grey-scale inversion improves detection of lung nodules. British Journal of Radiology. 86(1021). 27961545–27961545. 14 indexed citations
10.
Haygood, Tamara Miner, John Ryan, Patrick Brennan, et al.. (2012). On the choice of acceptance radius in free-response observer performance studies. British Journal of Radiology. 86(1021). 42313554–42313554. 15 indexed citations
11.
McNulty, J.P., John Ryan, Michael G. Evanoff, & Louise Rainford. (2012). Flexible Image Evaluation. Academic Radiology. 19(8). 1023–1028. 33 indexed citations
12.
Brennan, Patrick, et al.. (2008). The Impact of Acoustic Noise Found Within Clinical Departments on Radiology Performance. Academic Radiology. 15(4). 472–476. 16 indexed citations
13.
Mulvihill, Niall, John Ryan, & Charlotte Bell. (2006). Real time three dimensional imaging of zone of ischaemia derived from surface 12 lead ECG during percutaneous coronary revascularisation. Heart. 92(9). 1302–1302. 2 indexed citations
14.
Bielefeldt‐Ohmann, Helle, Dan H. Barouch, A. Gregory Bruce, et al.. (2005). Intestinal Stromal Tumors in a Simian Immunodeficiency Virus-infected, Simian Retrovirus-2 Negative Rhesus Macaque (Macaca mulatta). Veterinary Pathology. 42(3). 391–396. 29 indexed citations
15.
Ryan, John. (1990). Cells of Harmonicity and Generalized Cauchy Integral Formulae. Proceedings of the London Mathematical Society. s3-60(2). 295–318. 13 indexed citations
16.
Ryan, John. (1989). Dirac operators, Schrödinger type operators in Cn, and Huygens principle. Journal of Functional Analysis. 87(2). 321–347. 3 indexed citations
17.
Ryan, John, et al.. (1988). Generalized solutions for a dead‐end duct having a permeable barrier. The Canadian Journal of Chemical Engineering. 66(4). 529–535.
18.
Ryan, John. (1987). Hypercomplex algebras, hypercomplex analysis and conformal invariance. Compositio Mathematica. 61(1). 61–80. 5 indexed citations
19.
Madelin, M.F., et al.. (1978). Spiral Growth of Fungus Colonies. Journal of General Microbiology. 106(1). 73–80. 19 indexed citations
20.
Ryan, John & Graham H. Neale. (1977). Two‐phase flow through fractures in porous media. The Canadian Journal of Chemical Engineering. 55(4). 471–472. 4 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.

Explore authors with similar magnitude of impact

Breakdown of academic impact, for papers by Braden Goddard Breakdown of academic impact, for papers by B.J. Oosterveld Breakdown of academic impact, for papers by Wim Vos Breakdown of academic impact, for papers by Gregg Tracton Breakdown of academic impact, for papers by Shu-Jen Yeh Breakdown of academic impact, for papers by M. Demi Breakdown of academic impact, for papers by Rafal Kustra Breakdown of academic impact, for papers by Shinjini Kundu Breakdown of academic impact, for papers by Sasank Chilamkurthy Breakdown of academic impact, for papers by Jun Guo
Rankless by CCL
2026