Hisashi Oka

455 total citations
28 papers, 355 citations indexed

About

Hisashi Oka is a scholar working on Radiology, Nuclear Medicine and Imaging, Surgery and Pulmonary and Respiratory Medicine. According to data from OpenAlex, Hisashi Oka has authored 28 papers receiving a total of 355 indexed citations (citations by other indexed papers that have themselves been cited), including 13 papers in Radiology, Nuclear Medicine and Imaging, 10 papers in Surgery and 7 papers in Pulmonary and Respiratory Medicine. Recurrent topics in Hisashi Oka's work include Medical Imaging Techniques and Applications (8 papers), Cardiac Imaging and Diagnostics (5 papers) and Colorectal Cancer Treatments and Studies (4 papers). Hisashi Oka is often cited by papers focused on Medical Imaging Techniques and Applications (8 papers), Cardiac Imaging and Diagnostics (5 papers) and Colorectal Cancer Treatments and Studies (4 papers). Hisashi Oka collaborates with scholars based in Japan, Spain and Germany. Hisashi Oka's co-authors include Toshiisa Uehara, Tsunehiko Nishimura, Kohei Hayashida, Hisateru Takano, Tsuyoshi Shimonagata, Kōichi Aso, T Noto, K Nishiyama, Nobuya Ogawa and Yoshio Ishida and has published in prestigious journals such as Journal of Cerebral Blood Flow & Metabolism, The American Journal of Surgery and Diseases of the Colon & Rectum.

In The Last Decade

Hisashi Oka

23 papers receiving 328 citations

Peers

Countries citing papers authored by Hisashi Oka

Since Specialization

Citations

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

Fields of papers citing papers by Hisashi Oka

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Hisashi Oka

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

#	Work	Indexed citations
1	Volumetric Display with Dual-Path Holographic Laser Rendering 2024 ·(unknown), Hisashi Oka, (unknown), (unknown), Yoshio Hayasaki	0
2	Study on the estimation of motor electromagnetic force and improvement of estimation accuracy 2023 ·Hisashi Oka, Kan Akatsu	1
3	Optimization of transmission scan duration for 15O PET study with sequential dual tracer administration using N-index 2010 ·Annals of Nuclear Medicine ·Nobuyuki Kudomi, Hiroshi Watabe, Takuya Hayashi, Hisashi Oka, Yoshinori Miyake, Hidehiro Iida	5
4	Usefulness of Attenuation Correction with Transmission Source in Myocardial SPECT 2006 ·Japanese Journal of Radiological Technology ·(unknown), (unknown), Yoshihiro Nishimura, (unknown), (unknown), Hisashi Oka	3
5	Evidence Based Medicine for Nuclear Medicine Technology(Evidence-Based Radiological Technology) 2005 ·Japanese Journal of Radiological Technology ·Hisashi Oka	0
6	A rapid CBF/CMRO₂ measurement with a single PET scan with dual-tracer/integration technique in human 2005 ·Journal of Cerebral Blood Flow & Metabolism ·(unknown), Nobuyuki Kudomi, Hiroshi Watabe, Hisashi Oka, Kohei Hayashida, Yoshinori Miyake, Hidehiro Iida	1
7	[Multicenter comparative study of the recurrence-inhibitory effect of oral fluoropyrimidine drugs in patients with colorectal cancer following curative resection]. 2005 ·Gan to kagaku ryōhō ·Sotaro Sadahiro, Toshio Mitomi, T Noto, Kaoru Kumada, Yoshiki Hiki, Tatsuo Yamakawa, (unknown), (unknown), Yoshimasa Otani, Hisashi Oka, (unknown), Shoji Takemiya, Kiyoshi Nishiyama, (unknown), (unknown), Nobuya Ogawa, (unknown)	1
8	Endoscopic Treatment of the Large Intestine Endoscopic Balloon Dilatation for Treating Postoperative Anastomotic Strictures in the Large Intestine 2004 ·The Showa University Journal of Medical Sciences ·Hisashi Oka, (unknown), (unknown), (unknown), (unknown), (unknown), (unknown), (unknown), Yutaka Endo, Rikiya Fujita	1
9	Measurement of Left Ventricular Chamber and Myocardial Volume in Hypertrophic Cardiomyopathy Patients by ECG-gated Myocardial Perfusion SPECT : Application of a Newly Developed Edge-detection Algorithm 2002 ·Japanese Journal of Radiological Technology ·Yoshihiro Nishimura, (unknown), (unknown), (unknown), Hisashi Oka, Hideaki Mori, Kenya Murase	2
10	A Case of Pneumatosis Cystoides Intestinalis in which Hyperbaric Oxygen Therapy was Conducted after Surgery. 2002 ·Nihon Rinsho Geka Gakkai Zasshi (Journal of Japan Surgical Association) ·(unknown), Hiroki Mizukami, (unknown), (unknown), Kiyoshi Hataya, Hisashi Oka	2
11	[Final results of a randomized clinical trial of adjuvant intraportal chemotherapy for colorectal cancer: Intraportal Chemotherapy for Colorectal Cancer Group]. 2002 ·PubMed ·(unknown), (unknown), Hisashi Oka, (unknown), (unknown), (unknown), (unknown), Masaru Hagiwara, (unknown), (unknown), (unknown), (unknown), (unknown), (unknown), Susumu Yamaguchi, Atsuaki Gunji	1
12	Evaluation of a commercial PET tomograph-based system for the quantitative assessment of rCBF, rOEF and rCMRO2 by using sequential administration of 15O-labeled compounds 2002 ·Annals of Nuclear Medicine ·Miho Shidahara, Hiroshi Watabe, Kyeong Min Kim, Hisashi Oka, (unknown), Takuya Hayashi, Yoshinori Miyake, Yoshio Ishida, Kohei Hayashida, Takashi Nakamura, Hidehiro Iida	37
13	Endoscopic Decompression of Acute Colonic Obstruction. 1999 ·Nihon Daicho Komonbyo Gakkai Zasshi ·Hisashi Oka, Yoshiko Ishida, (unknown), (unknown), (unknown)	21
14	Myocardial glucose metabolism in patients with hypertrophic cardiomyopathy: Assessment by F-18-FDG PET study 1998 ·Annals of Nuclear Medicine ·Toshiisa Uehara, Yoshio Ishida, Kohei Hayashida, Tsuyoshi Shimonagata, Yoshinori Miyake, (unknown), Hisashi Oka, Seiki Nagata, Kunio Miyatake, Tsunehiko Nishimura	20
15	Measurement of 5-fluorouracil in scalp hair: a possible index of patient compliance with oral adjuvant chemotherapy 1996 ·European Journal of Clinical Pharmacology ·Toshihiko Uematsu, M Nakashima, Masashi Fujii, (unknown), M Yasutomi, Susumu Kodaira, Tomoyuki Kato, Kenjiro Kotake, Hisashi Oka, (unknown)	14
16	[A case of hemangioma of small intestine with massive bleeding]. 1993 ·PubMed ·(unknown), (unknown), (unknown), (unknown), Rikiya Fujita, (unknown), Yasuo Ishida, Hisashi Oka	1
17	Randomized, controlled study on adjuvant immunochemotherapy with PSK® in curatively resected colorectal cancer 1992 ·Diseases of the Colon & Rectum ·Toshio Mitomi, (unknown), (unknown), Kōichi Aso, (unknown), K Nishiyama, (unknown), (unknown), (unknown), Hisashi Oka, (unknown), T Noto, Nobuya Ogawa	92
18	Serial assessment of denervated but viable myocardium following acute myocardial infarction in dogs using iodine-123 metaiodobenzylguanidine and thallium-201 chloride myocardial single photon emission tomography 1992 ·European Journal of Nuclear Medicine and Molecular Imaging ·Tsunehiko Nishimura, Hisashi Oka, (unknown), Takeshi Matsuo, Toshiisa Uehara, (unknown), Hisateru Takano	28
19	Fatty acid myocardial imaging using 123I-?-methyl-iodophenyl pentadecanoic acid (BMIPP): comparison of myocardial perfusion and fatty acid utilization in canine myocardial infarction (Occlusion and reperfusion model) 1989 ·European Journal of Nuclear Medicine and Molecular Imaging ·Tsunehiko Nishimura, (unknown), (unknown), Hisashi Oka, Tsuyoshi Shimonagata, (unknown), Makoto Hayashi, Toshiisa Uehara, Kohei Hayashida, Hiroyuki Noda, Hisateru Takano	58
20	BASIC AND CLINICAL EVALUATION OF CEREBRAL BLOOD FLOW SCINTIGRAPHY WITH Tc-99m d, 1-HM-PAO 1988 ·Japanese Journal of Radiological Technology ·Ichiro Yokota, Hisashi Oka, (unknown), Makoto Hayashi	1

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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