Hirofumi Koen

655 total citations
18 papers, 528 citations indexed

About

Hirofumi Koen is a scholar working on Hepatology, Epidemiology and Oncology. According to data from OpenAlex, Hirofumi Koen has authored 18 papers receiving a total of 528 indexed citations (citations by other indexed papers that have themselves been cited), including 9 papers in Hepatology, 8 papers in Epidemiology and 5 papers in Oncology. Recurrent topics in Hirofumi Koen's work include Liver Disease Diagnosis and Treatment (7 papers), Liver Disease and Transplantation (7 papers) and Drug Transport and Resistance Mechanisms (3 papers). Hirofumi Koen is often cited by papers focused on Liver Disease Diagnosis and Treatment (7 papers), Liver Disease and Transplantation (7 papers) and Drug Transport and Resistance Mechanisms (3 papers). Hirofumi Koen collaborates with scholars based in Japan and United States. Hirofumi Koen's co-authors include Kunio Okuda, Kunihiko Ohnishi, Thomas D. Pugh, Stanley Goldfarb, Douglas Nychka, Joshua Chover, Grace Wahba, Motohide Takashi, Fumio Nomura and Hirotaka Musha and has published in prestigious journals such as Gastroenterology, Hepatology and Radiology.

In The Last Decade

Hirofumi Koen

18 papers receiving 501 citations

Peers — A (Enhanced Table)

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

Name	h						Papers	Cites
Hirofumi Koen Japan	9	274	224	173	93	64	18	528
L Taam United States	7	144 0.5×	199 0.9×	201 1.2×	148 1.6×	63 1.0×	7	535
N. Verthier France	8	146 0.5×	248 1.1×	149 0.9×	162 1.7×	27 0.4×	13	590
R. C. Day United Kingdom	9	87 0.3×	172 0.8×	131 0.8×	138 1.5×	26 0.4×	12	508
Shunichi KOGA Japan	12	104 0.4×	208 0.9×	214 1.2×	199 2.1×	146 2.3×	44	629
Yasutoshi Muto Japan	9	386 1.4×	286 1.3×	84 0.5×	283 3.0×	118 1.8×	14	818
Masako Shiba Japan	7	377 1.4×	386 1.7×	90 0.5×	146 1.6×	33 0.5×	9	679
K Takenaka Japan	11	197 0.7×	149 0.7×	130 0.8×	35 0.4×	20 0.3×	22	354
Y. Kamiyama Japan	15	282 1.0×	247 1.1×	335 1.9×	93 1.0×	60 0.9×	47	742
Shinji Iida Japan	12	246 0.9×	252 1.1×	132 0.8×	179 1.9×	21 0.3×	24	626
H Franke Germany	10	124 0.5×	130 0.6×	75 0.4×	52 0.6×	21 0.3×	84	449

Countries citing papers authored by Hirofumi Koen

Since Specialization

Citations

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

Fields of papers citing papers by Hirofumi Koen

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Hirofumi Koen

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

All Works

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18 of 18 papers shown

Nomura, Fumio, Kunihiko Ohnishi, Hirofumi Koen, et al.. (1986). Serum Cholinesterase in Patients with Fatty Liver. Journal of Clinical Gastroenterology. 8(5). 599–602. 31 indexed citations

Ohnishi, Kunihiko, Masayuki Saito, Shinichi Sato, et al.. (1985). Direction of splenic venous flow assessed by pulsed Doppler flowmetry in patients with a large splenorenal shunt. Gastroenterology. 89(1). 180–185. 52 indexed citations

Hatano, Hitoshi, Fumio Nomura, Kunihiko Ohnishi, et al.. (1985). Respective Roles of Hypoxia and Halothane Metabolism in Halothane–Induced Liver Injury in Rats. Hepatology. 5(2). 241–244. 9 indexed citations

Nomura, Fumio, Kunihiko Ohnishi, Hirofumi Koen, et al.. (1985). Effects of Hypoxia and Phenobarbital Treatment on the Metabolism of Mitomycin C in Experimental Animals. Hepatology. 5(6). 1190–1193. 4 indexed citations

Saito, Masayuki, et al.. (1984). Ultrasonic measurement of portal and splenic venous flow and their velocities in normal subjects and patients with chronic liver disease.. Kanzo. 25(10). 1281–1287. 2 indexed citations

Ohnishi, Kunihiko, Masayuki Saito, Masaaki Saito, et al.. (1984). . Kanzo. 25(5). 646–651. 1 indexed citations

Ohnishi, Kunihiko, Takatsune Nakayama, Masayuki Saito, et al.. (1984). Aneurysm of the intrahepatic branch of the portal vein. Gastroenterology. 86(1). 169–173. 48 indexed citations

Nychka, Douglas, Thomas D. Pugh, Hirofumi Koen, et al.. (1984). Optimal use of sampled tissue sections for estimating the number of hepatocellular foci.. PubMed. 44(1). 178–83. 15 indexed citations

Okuda, Kunio, Kunihiko Ohnishi, Kunio Kimura, et al.. (1984). Clinical Study of Eighty-six Cases of Idiopathic Portal Hypertension and Comparison With Cirrhosis With Splenomegaly. Gastroenterology. 86(4). 600–610. 157 indexed citations

10.

Ohnishi, Kunihiko, Takatsune Nakayama, Fumio Nomura, Hirofumi Koen, & Kunio Okuda. (1984). Reduction of Portal Vein Pressure with the Enlargement of Portal-Systemic Shunts. Journal of Clinical Gastroenterology. 6(5). 447–452. 5 indexed citations

11.

Hatano, Hitoshi, Kunihiko Ohnishi, Masayuki Saito, et al.. (1983). An unusual portal-systemic shunt, most likely through a patent ductus venosus -A case report-. Kanzo. 24(11). 1308–1312. 2 indexed citations

12.

Ohnishi, Kunihiko, et al.. (1983). . Kanzo. 24(11). 1308–1312. 1 indexed citations

13.

Koen, Hirofumi, Thomas D. Pugh, Douglas Nychka, & Stanley Goldfarb. (1983). Presence of alpha-fetoprotein-positive cells in hepatocellular foci and microcarcinomas induced by single injections of diethylnitrosamine in infant mice.. PubMed. 43(2). 702–8. 30 indexed citations

14.

Pugh, Thomas D., Hirofumi Koen, Douglas Nychka, et al.. (1983). Reliable stereological method for estimating the number of microscopic hepatocellular foci from their transections.. PubMed. 43(3). 1261–8. 141 indexed citations

15.

Goldfarb, Stanley, et al.. (1983). Preneoplastic and Neoplastic Progression during Hepatocarcinogenesis in Mice Injected with Diethylnitrosamine in Infancy. Environmental Health Perspectives. 50. 149–149. 3 indexed citations

16.

Koen, Hirofumi, Kunio Okuda, Hirotaka Musha, et al.. (1980). A dynamic study of rectally absorbed ammonia in liver cirrhosis using [13N] ammonia and a positron camera. Digestive Diseases and Sciences. 25(11). 842–848. 8 indexed citations

17.

Fukuda, Nobuo, Yukio Tateno, Tadahiko Matsumoto, et al.. (1977). Coincidence Positron Imaging of the Liver and Heart following Rectal Administration of 13N-ammonia in Liver Cirrhosis. RADIOISOTOPES. 26(12). 872–875. 2 indexed citations

18.

Okuda, Kunio, Yoshiro Kanda, Yoshio Fukuyama, et al.. (1976). Hepatic Lymphatics as Opacified by Percutaneous Intrahepatic Injection of Contrast Medium. Radiology. 120(2). 321–326. 17 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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