I Koyanagi

481 total citations
22 papers, 344 citations indexed

About

I Koyanagi is a scholar working on Surgery, Pathology and Forensic Medicine and Public Health, Environmental and Occupational Health. According to data from OpenAlex, I Koyanagi has authored 22 papers receiving a total of 344 indexed citations (citations by other indexed papers that have themselves been cited), including 10 papers in Surgery, 8 papers in Pathology and Forensic Medicine and 8 papers in Public Health, Environmental and Occupational Health. Recurrent topics in I Koyanagi's work include Spinal Dysraphism and Malformations (8 papers), Cerebrospinal fluid and hydrocephalus (6 papers) and Spinal Cord Injury Research (4 papers). I Koyanagi is often cited by papers focused on Spinal Dysraphism and Malformations (8 papers), Cerebrospinal fluid and hydrocephalus (6 papers) and Spinal Cord Injury Research (4 papers). I Koyanagi collaborates with scholars based in Japan. I Koyanagi's co-authors include Kazutoshi Hida, Hiroshi Abe, Yugo Iwasaki, M Akino, Toyohiko Isu, Yoshinobu Iwasaki, Kazuo Miyasaka, Takeshi Asano, Satoshi Ushikoshi and Hiroshi Abe and has published in prestigious journals such as Journal of neurosurgery, Journal of Neurology Neurosurgery & Psychiatry and Spinal Cord.

In The Last Decade

I Koyanagi

22 papers receiving 324 citations

Peers

I Koyanagi

SURGE

PHEOH

PFM

CMN

NEURO

C Iffenecker France

Ki Hong Cho South Korea

Aska Arnautovic United States

M Šercl Czechia

Sui-To Wong China

Francisco A. Gutierrez United States

Patrick Shih United States

Raffaele de Falco Italy

A. Menkü Türkiye

Ian M. Heger United States

C Iffenecker France

I Koyanagi

142 ×0.7

SURGE

112 ×0.6

PHEOH

71 ×0.5

PFM

101 ×0.9

CMN

86 ×1.3

NEURO

Citations per year, relative to I Koyanagi I Koyanagi (= 1×) peers C Iffenecker

Countries citing papers authored by I Koyanagi

Since Specialization

Citations

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

Fields of papers citing papers by I Koyanagi

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of I Koyanagi

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

All Works

Sort: Min cites: Since: Top N: Style:

20 of 20 papers shown

Haraguchi, Koichi, Kiyohiro Houkin, I Koyanagi, Tadashi Nonaka, & Tsuyoshi Baba. (2008). Evaluation of Carotid Plaque Composition by Computed Tomographic Angiography and Black Blood Magnetic Resonance Images. min - Minimally Invasive Neurosurgery. 51(2). 91–94. 5 indexed citations

Akiyama, Yukinori, I Koyanagi, Kazuhisa Yoshifuji, et al.. (2008). Interstitial spinal-cord oedema in syringomyelia associated with Chiari type 1 malformations. Journal of Neurology Neurosurgery & Psychiatry. 79(10). 1153–1158. 19 indexed citations

Haraguchi, Koichi, Kiyohiro Houkin, I Koyanagi, Tadashi Nonaka, & Tsuyoshi Baba. (2008). Evaluation of Carotid Plaque Composition by Computed Tomography Angiography and Black Blood Magnetic Resonance Image. Interventional Neuroradiology. 14(1). 39–43. 4 indexed citations

Houkin, Kiyohiro, et al.. (2006). The 5-Hydroxytryptamine_2A Receptor Antagonist Sarpogrelate Hydrochloride Inhibits Acute Platelet Aggregation in Injured Endothelium. Journal of International Medical Research. 34(1). 65–72. 4 indexed citations

Koyanagi, I, Yugo Iwasaki, Kazutoshi Hida, et al.. (2000). Factors in neurological deterioration and role of surgical treatment in lumbosacral spinal lipoma. Child s Nervous System. 16(3). 143–149. 18 indexed citations

Miyasaka, Kazuo, Takeshi Asano, Satoshi Ushikoshi, Kazutoshi Hida, & I Koyanagi. (2000). Vascular Anatomy of the Spinal Cord and Classification of Spinal Arteriovenous Malformations. Interventional Neuroradiology. 6(1_suppl). 195–198. 43 indexed citations

Miyazawa, N, Kazutoshi Hida, Yugo Iwasaki, I Koyanagi, & H Abe. (2000). MRI at 1.5 T of intramedullary ependymoma and classification of pattern of contrast enhancement. Neuroradiology. 42(11). 828–832. 35 indexed citations

Iwasaki, Yugo, I Koyanagi, Kazutoshi Hida, & Hiroshi Abe. (1999). Syringo-subarachnoid shunt for syringomyelia using partial hemilaminectomy. British Journal of Neurosurgery. 13(1). 41–45. 18 indexed citations

Koyanagi, I, et al.. (1998). Magnetic resonance imaging findings in ossification of the posterior longitudinal ligament of the cervical spine. Journal of neurosurgery. 88(2). 247–254. 45 indexed citations

10.

Koyanagi, I, et al.. (1997). Surgical treatment of syringomyelia associated with spinal dysraphism. Child s Nervous System. 13(4). 194–200. 32 indexed citations

11.

Koyanagi, I, Yoshinobu Iwasaki, Kazutoshi Hida, et al.. (1997). Surgical treatment supposed natural history of the tethered cord with occult spinal dysraphism. Child s Nervous System. 13(5). 268–274. 69 indexed citations

12.

Takahashi, Ikuko, Yuji Iwasaki, Kazutoshi Hida, I Koyanagi, & Hirohisa Abe. (1996). [Clinical study of intraspinal neoplasms in children].. PubMed. 24(7). 605–11. 2 indexed citations

13.

Yoshimoto, Takayuki, et al.. (1992). [Anterior approach for cervical dumb-bell typed neurinomas].. PubMed. 20(4). 481–5. 1 indexed citations

14.

H, Abe, Yuji Iwasaki, M Akino, et al.. (1991). [Diagnosis and surgical treatment of spinal hemangioblastoma].. PubMed. 19(2). 149–55. 8 indexed citations

15.

Akino, M, et al.. (1991). [Magnetic resonance imaging of posttraumatic syringomyelia and its surgical treatment].. PubMed. 19(1). 41–6. 1 indexed citations

16.

Koyanagi, I, et al.. (1989). Significance of spinal cord swelling in the prognosis of acute cervical spinal cord injury. Spinal Cord. 27(3). 190–197. 19 indexed citations

17.

Koyanagi, I, et al.. (1988). [Spinal epidural tumors without destructive bone change: clinical and radiological studies].. PubMed. 16(8). 953–8. 2 indexed citations

18.

Ishikawa, Tatsuya, Yuji Iwasaki, M Akino, et al.. (1988). [Spinal intramedullary tumor with exophytic growth].. PubMed. 16(12). 1339–45. 9 indexed citations

19.

Koyanagi, I, M Akino, Kazutoshi Hida, et al.. (1988). [Thermographic findings of syringomyelia].. PubMed. 16(10). 1149–54. 6 indexed citations

20.

Koyanagi, I, Toyohiko Isu, M Akino, et al.. (1985). [External immobilization of cervical spine with a halo vest--experience with 31 cases].. PubMed. 13(6). 615–21. 2 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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