Hiroyuki Okayasu

628 total citations
27 papers, 489 citations indexed

About

Hiroyuki Okayasu is a scholar working on Neurology, Pulmonary and Respiratory Medicine and Radiology, Nuclear Medicine and Imaging. According to data from OpenAlex, Hiroyuki Okayasu has authored 27 papers receiving a total of 489 indexed citations (citations by other indexed papers that have themselves been cited), including 16 papers in Neurology, 6 papers in Pulmonary and Respiratory Medicine and 6 papers in Radiology, Nuclear Medicine and Imaging. Recurrent topics in Hiroyuki Okayasu's work include Traumatic Brain Injury and Neurovascular Disturbances (13 papers), Cerebrovascular and Carotid Artery Diseases (6 papers) and Acute Ischemic Stroke Management (5 papers). Hiroyuki Okayasu is often cited by papers focused on Traumatic Brain Injury and Neurovascular Disturbances (13 papers), Cerebrovascular and Carotid Artery Diseases (6 papers) and Acute Ischemic Stroke Management (5 papers). Hiroyuki Okayasu collaborates with scholars based in Japan, United States and United Kingdom. Hiroyuki Okayasu's co-authors include Fumio Gotoh, Akiko Koto, John Stirling Meyer, Yuko Kitagawa, H. Tachibana, Hisao Tachibana, Yoshihiro Wakayama, Norihiro Suzuki, Yasuo Fukuuchi and Takashi Okabe and has published in prestigious journals such as Neurology, Stroke and Journal of neurosurgery.

In The Last Decade

Hiroyuki Okayasu

26 papers receiving 464 citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Hiroyuki Okayasu Japan 13 244 106 97 66 63 27 489
Fausto Viader France 10 246 1.0× 50 0.5× 80 0.8× 95 1.4× 172 2.7× 28 536
Makoto Miyaoka Japan 11 223 0.9× 40 0.4× 50 0.5× 50 0.8× 65 1.0× 19 445
Louis Wener United States 11 266 1.1× 32 0.3× 83 0.9× 77 1.2× 23 0.4× 18 598
Lizia Reni Italy 13 195 0.8× 49 0.5× 64 0.7× 36 0.5× 36 0.6× 26 540
Kevin E. Crutchfield United States 8 154 0.6× 81 0.8× 111 1.1× 37 0.6× 88 1.4× 16 465
Akira Yagishita Japan 12 256 1.0× 35 0.3× 59 0.6× 88 1.3× 56 0.9× 33 597
John R. Warmolts United States 11 325 1.3× 56 0.5× 95 1.0× 25 0.4× 24 0.4× 15 531
Hong‐Shiu Chang Taiwan 16 225 0.9× 84 0.8× 96 1.0× 46 0.7× 33 0.5× 39 603
Denis Melançon Canada 13 500 2.0× 74 0.7× 33 0.3× 46 0.7× 123 2.0× 21 719
David C. Haas United States 13 269 1.1× 41 0.4× 54 0.6× 41 0.6× 117 1.9× 20 612

Countries citing papers authored by Hiroyuki Okayasu

Since Specialization
Citations

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

Fields of papers citing papers by Hiroyuki Okayasu

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Hiroyuki Okayasu

This figure shows the co-authorship network connecting the top 25 collaborators of Hiroyuki Okayasu. A scholar is included among the top collaborators of Hiroyuki Okayasu 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 Hiroyuki Okayasu. Hiroyuki Okayasu 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.
Ohbu, Sadayoshi, Hisaka Igarashi, Hiroyuki Okayasu, et al.. (2004). Development and Testing of the Japanese Version of the Migraine-Specific Quality of Life Instrument. Quality of Life Research. 13(8). 1489–1493. 8 indexed citations
2.
Konishi, Hiroko, et al.. (1996). [A case of plasma cell granuloma associated with cerebral infarction].. PubMed. 36(7). 854–7. 2 indexed citations
3.
Okayasu, Hiroyuki, et al.. (1993). [A case of cough hemiplegia].. PubMed. 33(7). 740–5. 1 indexed citations
4.
Suzuki, Koichi, Yoshihiro Wakayama, Hitomi Takada, & Hiroyuki Okayasu. (1992). [A case of chronic toluene intoxication with abnormal MRI findings: abnormal intensity areas in cerebral white matter, basal ganglia, internal capsule, brain stem and middle cerebellar peduncle].. PubMed. 32(1). 84–7. 8 indexed citations
5.
Kitagawa, Yuko, Hiroyuki Okayasu, Yasuo Matsuoka, Ban Mihara, & Akiko Koto. (1991). [Anticardiolipin antibody in cerebral infarction].. PubMed. 31(4). 391–5. 2 indexed citations
6.
Kitagawa, Yasuhisa, et al.. (1991). Effect of Eperisone Hydrochloride on Tension-Type Headache: Assessment with a Pressure-Displacement Transducer. Cephalalgia. 11(11_suppl). 335–336.
7.
Kitagawa, Yuko, Fumio Gotoh, Akiko Koto, & Hiroyuki Okayasu. (1990). Stroke in systemic lupus erythematosus.. Stroke. 21(11). 1533–1539. 109 indexed citations
8.
Kawasaki, Hitoshi, Yoshihiro Wakayama, Hiroyuki Okayasu, Hirohide Takahashi, & Seiji Shibuya. (1988). Levels of serum and cerebrospinal fluid enolase in the patients with cerebral vascular disease and other neurological diseases.. Nosotchu. 10(4). 313–318. 4 indexed citations
9.
Tachibana, Hisao, et al.. (1984). Changing Topographic Patterns of Human Cerebral Blood Flow with Age Measured by Xenon CT. American Journal of Neuroradiology. 5(2). 139–146. 13 indexed citations
10.
Tachibana, H., et al.. (1984). Changing topographic patterns of human cerebral blood flow with age measured by xenon CT. American Journal of Roentgenology. 142(5). 1027–1034. 24 indexed citations
11.
Okayasu, Hiroyuki, et al.. (1984). Lithium Carbonate Has No Measurable Effect on Cerebral Hemodynamics in Cluster Headaches. Headache The Journal of Head and Face Pain. 24(1). 1–4. 6 indexed citations
12.
Wakayama, Yoshihiro, Hiroyuki Okayasu, & Toshiyuki Kumagai. (1984). Quantitative freeze-fracture electron microscopic study of muscle plasma membrane of experimental anoxic myopathy. Journal of the Neurological Sciences. 63(3). 411–421. 2 indexed citations
13.
Kitagawa, Yuko, et al.. (1983). Creutzfeldt-Jakob disease: a case with extensive white matter degeneration and optic atrophy. Journal of Neurology. 229(2). 97–101. 19 indexed citations
14.
Tachibana, Hisao, Fumio Gotoh, Hiroyuki Okayasu, et al.. (1983). Prognostic value of cerebral blood flow autoregulation in the long-term prognosis of ischemic cerebrovascular disease. Journal of the Neurological Sciences. 60(2). 197–204. 1 indexed citations
15.
Okabe, Takashi, John Stirling Meyer, Takahiro Amano, Hiroyuki Okayasu, & Karl F. Mortel. (1983). Prostaglandin Inhibition and Cerebrovascular Hemodynamics in Normal and Ischemic Human Brain. Journal of Cerebral Blood Flow & Metabolism. 3(1). 115–121. 16 indexed citations
16.
Tachibana, Hisao, et al.. (1982). Long-term prognosis in ischemic cerebrovascular disease in relation to cerebral blood flow and metabolism. Journal of the Neurological Sciences. 56(2-3). 357–364. 7 indexed citations
17.
Tanaka, K, Fumio Gotoh, Yasuo Fukuuchi, et al.. (1982). Effect of nimodipine, a calcium antagonist, on cerebral vasospasm after subarachnoid hemorrhage in cats.. PubMed. 32(12). 1529–34. 24 indexed citations
18.
Tachibana, Hisao, et al.. (1980). Cerebral hemodynamics and functional prognosis in patients with ischemic cerebrovascular disease. Nosotchu. 2(1). 8–13. 1 indexed citations
19.
Tanaka, Keiji, Fumio Gotoh, Yasuo Fukuuchi, et al.. (1980). Effects of nimodipine (Bay e 9736) on cerebral circulation in cats.. PubMed. 30(9). 1494–7. 37 indexed citations
20.
Gotoh, Fumio, Tadashi Kanda, Yasuo Fukuuchi, et al.. (1977). Role of noradrenergic system in cerebral arterial spasm after subarachnoid hemorrhage.. PubMed. 64. 342–3. 3 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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