T Koyama

949 total citations
47 papers, 730 citations indexed

About

T Koyama is a scholar working on Surgery, Ophthalmology and Radiology, Nuclear Medicine and Imaging. According to data from OpenAlex, T Koyama has authored 47 papers receiving a total of 730 indexed citations (citations by other indexed papers that have themselves been cited), including 14 papers in Surgery, 13 papers in Ophthalmology and 11 papers in Radiology, Nuclear Medicine and Imaging. Recurrent topics in T Koyama's work include Spine and Intervertebral Disc Pathology (9 papers), Ocular Diseases and Behçet’s Syndrome (9 papers) and Retinal and Optic Conditions (8 papers). T Koyama is often cited by papers focused on Spine and Intervertebral Disc Pathology (9 papers), Ocular Diseases and Behçet’s Syndrome (9 papers) and Retinal and Optic Conditions (8 papers). T Koyama collaborates with scholars based in Japan and United States. T Koyama's co-authors include Nobuhiko Matsuo, Iwao Nishiura, Toshihiko Matsuo, Hajime Handa, Toshiro Sugimoto, Hideyuki Sawada, Daisuke Koya, Kenji Nishihara, Takashi Uzu and Masami Chin‒Kanasaki and has published in prestigious journals such as Free Radical Biology and Medicine, American Journal of Ophthalmology and Journal of Evolutionary Biology.

In The Last Decade

T Koyama

44 papers receiving 699 citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
T Koyama Japan 16 240 229 137 133 85 47 730
Hidetaka Noma Japan 15 260 1.1× 43 0.2× 30 0.2× 22 0.2× 19 0.2× 44 579
Andrea Sánchez‐Navarro Mexico 13 61 0.3× 51 0.2× 53 0.4× 128 1.0× 18 0.2× 27 535
Vanessa Morais Lima Brazil 11 89 0.4× 140 0.6× 171 1.2× 92 0.7× 11 0.1× 24 603
Kaori Kobayashi Japan 19 378 1.6× 81 0.4× 80 0.6× 81 0.6× 31 0.4× 38 712
K. Kawai Japan 18 30 0.1× 212 0.9× 21 0.2× 98 0.7× 39 0.5× 36 939
B. Quadbeck Germany 15 106 0.4× 83 0.4× 433 3.2× 64 0.5× 29 0.3× 27 1.1k
J. M. Heaton United Kingdom 13 47 0.2× 78 0.3× 85 0.6× 155 1.2× 244 2.9× 26 1.3k
R. A. Metcalfe United Kingdom 16 61 0.3× 39 0.2× 141 1.0× 54 0.4× 43 0.5× 31 717
Ana Pinheiro Machado Canton Brazil 18 205 0.9× 98 0.4× 23 0.2× 36 0.3× 10 0.1× 37 894
Sarper Karaküçük Türkiye 17 352 1.5× 58 0.3× 22 0.2× 63 0.5× 39 0.5× 42 674

Countries citing papers authored by T Koyama

Since Specialization
Citations

This map shows the geographic impact of T Koyama'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 T Koyama with the expected number of citations based on a country's size and research output (numbers larger than one mean the country cites T Koyama more than expected).

Fields of papers citing papers by T Koyama

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of T Koyama

This figure shows the co-authorship network connecting the top 25 collaborators of T Koyama. A scholar is included among the top collaborators of T Koyama 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 T Koyama. T Koyama 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.
Koyama, T, Hiromu Ito, Satoshi Kakishima, et al.. (2015). Geographic body size variation in the periodical cicadas Magicicada : implications for life cycle divergence and local adaptation. Journal of Evolutionary Biology. 28(6). 1270–1277. 14 indexed citations
2.
Isshiki, Keiji, Jun Nakazawa, Toshiro Sugimoto, et al.. (2008). Cervical tumoral calcinosis in a patient on maintenance hemodialysis. Nihon Toseki Igakkai Zasshi. 41(8). 483–488.
3.
Sugimoto, Toshiro, Mako Yasuda, Masayoshi Sakaguchi, et al.. (2008). Acute interstitial nephritis associated with etanercept. Rheumatology International. 28(12). 1283–1284. 4 indexed citations
4.
Oshika, Tetsuro, Yuichi Ohashi, Shigeki Okamoto, et al.. (2006). Incidence of Intraoperative Floppy Iris Syndrome in Patients on Either Systemic or Topical α1-Adrenoceptor Antagonist. American Journal of Ophthalmology. 143(1). 150–151. 77 indexed citations
5.
Sugimoto, Toshiro, et al.. (2006). The occurrence of systemic lupus erythematosus in an asymptomatic carrier of human T-cell lymphotropic virus type I. Clinical Rheumatology. 26(6). 1005–1007. 4 indexed citations
6.
Kawai, Makoto, et al.. (2002). A case of idiopathic spinal epidural lipomatosis presented with radicular pain caused by compression with enlarged veins surrounding nerve roots. Acta Neurologica Scandinavica. 105(4). 322–325. 29 indexed citations
7.
Koyama, T, et al.. (1996). [Far lateral lumbar disc herniation: clinical and radiographical features of three cases].. PubMed. 24(4). 363–7.
8.
Sawada, Hideyuki, et al.. (1995). Dysphagia caused by an anterior cervical osteophyte: case report. Neuroradiology. 37(1). 58–59. 20 indexed citations
9.
Tani, Shoichi, et al.. (1993). [Evaluation of the postoperative regrowth of the acoustic neurinomas].. PubMed. 21(10). 909–13. 3 indexed citations
10.
Matsuo, Toshihiko, et al.. (1990). Retinal Vasculitis as a Complication of Rheumatoid Arthritis. Ophthalmologica. 201(4). 196–200. 17 indexed citations
11.
Koyama, T, Nobuhiko Matsuo, Keiichi Shimizu, et al.. (1990). Retinal circulation times in quantitative fluorescein angiography. Graefe s Archive for Clinical and Experimental Ophthalmology. 228(5). 442–446. 33 indexed citations
12.
Sawada, Hideyuki, Ichiro Akiguchi, Hidenao Fukuyama, Michitaka Kameyama, & T Koyama. (1989). Marked canal stenosis at the level of the atlas. Neuroradiology. 31(4). 346–348. 38 indexed citations
13.
Koyama, T, et al.. (1988). A Proposed Mild Type of Acute Retinal Necrosis Syndrome. American Journal of Ophthalmology. 105(6). 579–583. 41 indexed citations
14.
Matsuo, Takahiro, Toshinori Nakayama, T Koyama, & Nobuhiko Matsuo. (1987). Mild type acute retinal necrosis syndrome involving both eyes at three-year interval.. PubMed. 31(3). 455–60. 5 indexed citations
15.
Matsuo, Toshihiko, et al.. (1987). Cytological and Immunological Study of the Aqueous Humor in Acute Retinal Necrosis Syndrome. Ophthalmologica. 195(1). 38–44. 16 indexed citations
16.
Matsuo, Toshihiko, et al.. (1986). Immunological studies of uveitis. 3. Cell-mediated immunity to interphotoreceptor retinoid-binding protein.. PubMed. 30(4). 487–94. 7 indexed citations
17.
Koyama, T, et al.. (1985). [Redundant nerve roots--a review of its pathogenesis, clinical diagnosis and surgical treatment].. PubMed. 13(12). 1265–70. 2 indexed citations
18.
Koyama, T, et al.. (1984). Wegener's Granulomatosis with Destructive Ocular Manifestations. American Journal of Ophthalmology. 98(6). 736–740. 11 indexed citations
19.
Matsuo, Nobuhiko, et al.. (1980). [Two cases of retinal detachment with ocular hypertension and many outer segments of visual cells in the anterior chamber (author's transl)].. PubMed. 84(4). 282–94. 1 indexed citations
20.
Kondo, Akinori, et al.. (1978). Redundant nerve roots of the cauda equina. Acta Neurochirurgica. 42(3-4). 209–215. 12 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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