Takashi Koyama

7.3k total citations
168 papers, 4.6k citations indexed

About

Takashi Koyama is a scholar working on Surgery, Pulmonary and Respiratory Medicine and Reproductive Medicine. According to data from OpenAlex, Takashi Koyama has authored 168 papers receiving a total of 4.6k indexed citations (citations by other indexed papers that have themselves been cited), including 43 papers in Surgery, 37 papers in Pulmonary and Respiratory Medicine and 34 papers in Reproductive Medicine. Recurrent topics in Takashi Koyama's work include Endometriosis Research and Treatment (19 papers), MRI in cancer diagnosis (17 papers) and Ovarian cancer diagnosis and treatment (17 papers). Takashi Koyama is often cited by papers focused on Endometriosis Research and Treatment (19 papers), MRI in cancer diagnosis (17 papers) and Ovarian cancer diagnosis and treatment (17 papers). Takashi Koyama collaborates with scholars based in Japan, United States and United Kingdom. Takashi Koyama's co-authors include Kaori Togashi, Ken Tamai, Shigeaki Umeoka, Tsuneo Saga, Aki Kido, Masako Kataoka, Shingo Fujii, Toshitaka Fujiwara, Yoshiki Mikami and Milliam L. Kataoka and has published in prestigious journals such as SHILAP Revista de lepidopterología, Radiology and Spine.

In The Last Decade

Takashi Koyama

152 papers receiving 4.4k citations

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Takashi Koyama Japan	38	1.7k	1.7k	1.2k	964	908	168	4.6k
Eric K. Outwater United States	46	1.3k 0.7×	1.8k 1.1×	2.0k 1.7×	1.8k 1.9×	1.1k 1.2×	118	6.3k
Susan M. Ascher United States	36	1.7k 1.0×	1.5k 0.9×	1.0k 0.9×	1.1k 1.1×	551 0.6×	95	4.1k
Seung Eun Jung South Korea	31	541 0.3×	932 0.6×	1.1k 1.0×	714 0.7×	662 0.7×	164	3.6k
Lucia Manganaro Italy	31	1.1k 0.7×	1.1k 0.7×	775 0.7×	1.0k 1.0×	283 0.3×	185	3.6k
Fadi W. Abdul‐Karim United States	43	715 0.4×	770 0.5×	1.9k 1.7×	359 0.4×	1.8k 2.0×	230	7.0k
D. Paladini Italy	44	1.6k 1.0×	950 0.6×	1.9k 1.7×	329 0.3×	866 1.0×	213	6.3k
Sandro Sironi Italy	39	1.2k 0.7×	1.0k 0.6×	1.1k 1.0×	2.4k 2.5×	1.4k 1.5×	232	5.9k
Masako Kataoka Japan	33	706 0.4×	765 0.5×	443 0.4×	1.9k 2.0×	442 0.5×	143	3.4k
Deborah J. Gersell United States	31	2.0k 1.2×	1.0k 0.6×	1.4k 1.2×	228 0.2×	620 0.7×	58	4.6k
David A. Woodrum United States	34	424 0.3×	355 0.2×	622 0.5×	630 0.7×	965 1.1×	124	3.1k

Countries citing papers authored by Takashi Koyama

Since Specialization

Citations

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

Fields of papers citing papers by Takashi Koyama

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Takashi Koyama

This figure shows the co-authorship network connecting the top 25 collaborators of Takashi Koyama. A scholar is included among the top collaborators of Takashi 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 Takashi Koyama. Takashi Koyama 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

Koyama, Takashi, Naomi Kiyota, Shogen Boku, et al.. (2024). A phase II trial of paclitaxel plus biweekly cetuximab for patients with recurrent or metastatic head and neck cancer previously treated with both platinum-based chemotherapy and anti-PD-1 antibody. ESMO Open. 9(6). 103476–103476. 10 indexed citations

Koyama, Takashi, et al.. (2024). Lobar pneumonia due to human metapneumovirus: a case report. International Journal of Infectious Diseases. 146. 107162–107162. 1 indexed citations

Koyama, Takashi, et al.. (2023). Three Cases of Coronavirus Disease 2019 Vaccine-associated Organizing Pneumonia. Journal of Thoracic Imaging. 38(6). W90–W92.

Suzuki, Chiaki, Naomi Kiyota, Yoshinori Imamura, et al.. (2020). Effect of tumor burden and growth rate on treatment outcomes of nivolumab in head and neck cancer. International Journal of Clinical Oncology. 25(7). 1270–1277. 14 indexed citations

Fukuda, Hitoshi, Kosuke Hayashi, Takashi Koyama, et al.. (2015). Impact of Aneurysm Projection on Intraoperative Complications During Surgical Clipping of Ruptured Posterior Communicating Artery Aneurysms. Neurosurgery. 78(3). 381–390. 26 indexed citations

Sumiyoshi, Takayuki, Hiroshi Iwamura, Kenji Mitsumori, et al.. (2013). [Primitive neuroectodermal tumor of kidney : a case report].. PubMed. 59(6). 363–7. 1 indexed citations

Shiozawa, Tanri, Tsutomu Miyamoto, Hiroyasu Kashima, et al.. (2011). Preoperative Differential Diagnosis of Minimal Deviation Adenocarcinoma and Lobular Endocervical Glandular Hyperplasia of the Uterine Cervix. International Journal of Gynecological Cancer. 21(7). 1287–1296. 56 indexed citations

Goto, Hirofumi, Akihiro Kanematsu, Koji Yoshimura, et al.. (2009). Preoperative diagnosis of congenital segmental giant megaureter presenting as a fetal abdominal mass. Journal of Pediatric Surgery. 45(1). 269–271. 3 indexed citations

Koyama, Takashi, et al.. (2008). TWO CASES OF VOLVULUS OF THE CECUM IN PATIENTS OF GREAT AGES OVER NINETY. Nihon Rinsho Geka Gakkai Zasshi (Journal of Japan Surgical Association). 69(8). 2011–2015. 2 indexed citations

10.

Umeoka, Shigeaki, et al.. (2008). Pictorial Review of Tuberous Sclerosis in Various Organs. Radiographics. 28(7). e32–e32. 113 indexed citations

11.

Tamai, Ken, Takashi Koyama, & Kaori Togashi. (2007). MR features of ectopic pregnancy. European Radiology. 17(12). 3236–3246. 60 indexed citations

12.

Yamada, Eiji, et al.. (2007). A Case of a Minute Rectal Carcinoid with a Huge Metastatic Obturator Lymph Node. The Japanese Journal of Gastroenterological Surgery. 40(4). 491–496. 6 indexed citations

13.

Nakai, Asako, Kaori Togashi, Kenzo Kosaka, et al.. (2007). Do Anticholinergic Agents Suppress Uterine Peristalsis and Sporadic Myometrial Contractions at Cine MR Imaging?. Radiology. 246(2). 489–496. 28 indexed citations

14.

Sugimoto, Takaki, et al.. (2004). Large Perigraft Seroma After Aortoiliac Bypass with an Expanded Polytetrafluoroethylene Graft: Report of a Case. Surgery Today. 34(8). 698–700. 5 indexed citations

15.

Toyoda, Yasuhiro, et al.. (2003). CURATIVE SURGERY FOR COLON CANCER IN AN 101-YEAR-OLD WOMAN. Nihon Rinsho Geka Gakkai Zasshi (Journal of Japan Surgical Association). 64(10). 2543–2546. 2 indexed citations

16.

Koyama, Takashi, Kaori Togashi, Ikuo Konishi, et al.. (1999). MR imaging of endometrial stromal sarcoma: correlation with pathologic findings.. American Journal of Roentgenology. 173(3). 767–772. 79 indexed citations

17.

Kitamura, Koji, et al.. (1998). FREE VIBRATIONS OF PARTIAL CYLINDRICAL SHELLS BY EXACT SOLUTION AND PROPOSAL OF APPROXIMATE SOLUTION. Journal of Structural and Construction Engineering (Transactions of AIJ). 63(513). 121–125. 1 indexed citations

18.

Hatta, Takeshi, et al.. (1996). Risk Factors of Stomach Cancer Resection in the Elderly.. The Japanese Journal of Gastroenterological Surgery. 29(11). 2083–2091. 1 indexed citations

19.

Koyama, Takashi, et al.. (1991). Metastasis of cancer to cancer: Report of a case of esophageal carcinoma metastasizing to early gastric cancer. Surgery Today. 21(3). 352–356. 4 indexed citations

20.

Miyazaki, Masaru, Hiroshi Itoh, Takashi Kaiho, et al.. (1990). Surgical approaches for carcinoma of the hepatic duct confluence with hepatic vascular resection and reconstruction.. The Japanese Journal of Gastroenterological Surgery. 23(12). 2772–2776. 1 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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