Keiko Koyama

1.7k total citations
44 papers, 1.4k citations indexed

About

Keiko Koyama is a scholar working on Cardiology and Cardiovascular Medicine, Radiology, Nuclear Medicine and Imaging and Clinical Psychology. According to data from OpenAlex, Keiko Koyama has authored 44 papers receiving a total of 1.4k indexed citations (citations by other indexed papers that have themselves been cited), including 23 papers in Cardiology and Cardiovascular Medicine, 15 papers in Radiology, Nuclear Medicine and Imaging and 4 papers in Clinical Psychology. Recurrent topics in Keiko Koyama's work include Cardiac Arrhythmias and Treatments (19 papers), Atrial Fibrillation Management and Outcomes (15 papers) and Cardiac Imaging and Diagnostics (10 papers). Keiko Koyama is often cited by papers focused on Cardiac Arrhythmias and Treatments (19 papers), Atrial Fibrillation Management and Outcomes (15 papers) and Cardiac Imaging and Diagnostics (10 papers). Keiko Koyama collaborates with scholars based in Japan, United Kingdom and Poland. Keiko Koyama's co-authors include Yoshiharu Kim, Kiyoto Kasai, Masatake Uno, Keiko Matsuoka, Noriko Yamamoto‐Mitani, Akiko Honda, Yuko Okamoto, Yukari Takai, Shigeto Naito and Yoshiro Okubo and has published in prestigious journals such as SHILAP Revista de lepidopterología, Journal of Agricultural and Food Chemistry and Radiology.

In The Last Decade

Keiko Koyama

43 papers receiving 1.3k citations

Peers — A (Enhanced Table)

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

Name h Career Trend Papers Cites
Keiko Koyama Japan 18 369 308 261 254 136 44 1.4k
Stuart N. Hoffman United States 23 253 0.7× 195 0.6× 135 0.5× 186 0.7× 304 2.2× 39 1.9k
Eva Tsalikian United States 33 223 0.6× 124 0.4× 102 0.4× 93 0.4× 123 0.9× 83 3.5k
William H. Rosenblatt United States 22 173 0.5× 333 1.1× 286 1.1× 503 2.0× 111 0.8× 64 2.9k
Paul Hoff United States 26 183 0.5× 139 0.5× 71 0.3× 412 1.6× 522 3.8× 165 2.1k
Jun Cao China 19 93 0.3× 358 1.2× 102 0.4× 165 0.6× 258 1.9× 52 893
Michael Sweeney United States 22 243 0.7× 143 0.5× 64 0.2× 587 2.3× 543 4.0× 42 1.8k
Amanda R. Rabinowitz United States 21 91 0.2× 164 0.5× 103 0.4× 212 0.8× 233 1.7× 92 1.9k
Claire Fougerou France 10 139 0.4× 240 0.8× 109 0.4× 149 0.6× 64 0.5× 14 1.0k
Björn Mårtensson Sweden 24 159 0.4× 125 0.4× 35 0.1× 488 1.9× 226 1.7× 56 2.1k
Tali Vishne Israel 21 60 0.2× 180 0.6× 26 0.1× 266 1.0× 138 1.0× 46 1.1k

Countries citing papers authored by Keiko Koyama

Since Specialization
Citations

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

Fields of papers citing papers by Keiko Koyama

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Keiko Koyama

This figure shows the co-authorship network connecting the top 25 collaborators of Keiko Koyama. A scholar is included among the top collaborators of Keiko 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 Keiko Koyama. Keiko Koyama 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.
Sasaki, Takehito, Kohki Nakamura, Kentaro Minami, et al.. (2022). Local impedance measurements during contact force‐guided cavotricuspid isthmus ablation for predicting an effective radiofrequency ablation. Journal of Arrhythmia. 38(2). 245–252. 3 indexed citations
2.
Nakamura, Kohki, Takehito Sasaki, Kentaro Minami, et al.. (2021). Prevalence, characteristics, and predictors of endocardial and nonendocardial conduction gaps during local impedance‐guided extensive pulmonary vein isolation of atrial fibrillation with high‐resolution mapping. Journal of Cardiovascular Electrophysiology. 32(8). 2045–2059. 8 indexed citations
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Sasaki, Takehito, Kohki Nakamura, Kentaro Minami, et al.. (2020). Optimal local impedance drops for an effective radiofrequency ablation during cavo‐tricuspid isthmus ablation. Journal of Arrhythmia. 36(5). 905–911. 12 indexed citations
6.
Nakamura, Kohki, Takehito Sasaki, Yutaka Take, et al.. (2020). Effect of preventing air intrusion on silent strokes during atrial fibrillation ablation using a mini‐basket catheter. Pacing and Clinical Electrophysiology. 44(1). 71–81. 2 indexed citations
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Kitamura, Atsushi, Naoki Nishimura, Torahiko Jinta, et al.. (2015). [Safety of pemetrexed according to the duration of vitamin B12 and folic acid supplementation prior to the first dose of pemetrexed].. PubMed. 42(4). 471–5. 1 indexed citations
9.
Sakamoto, Tamotsu, Koji Kumagai, Suguru Nishiuchi, et al.. (2012). Predictors of asymptomatic cerebral infarction associated with radiofrequency catheter ablation for atrial fibrillation using an irrigated-tip catheter. EP Europace. 15(3). 332–338. 17 indexed citations
10.
Toyama, Takuji, Keiko Koyama, Shu Kasama, et al.. (2012). Olmesartan Improves Coronary Flow Reserve of Hypertensive Patients Using Coronary Magnetic Resonance Imaging Compared with Amlodipine. Cardiology. 122(4). 230–236. 13 indexed citations
11.
Ueda, Satoshi, Keiko Koyama, & Yoshiro Okubo. (2010). Marked Improvement of Psychotic Symptoms After Electroconvulsive Therapy in Parkinson Disease. Journal of Ect. 26(2). 111–115. 56 indexed citations
12.
Yokokawa, Miki, Hiroshi Tada, Keiko Koyama, et al.. (2009). Nontransmural Scar Detected by Magnetic Resonance Imaging and Origin of Ventricular Tachycardia in Structural Heart Disease. Pacing and Clinical Electrophysiology. 32(s1). S52–6. 7 indexed citations
13.
Endo, Keigo, Noboru Oriuchi, Tetsuya Higuchi, et al.. (2006). PET and PET/CT using 18F-FDG in the diagnosis and management of cancer patients. International Journal of Clinical Oncology. 11(4). 286–296. 90 indexed citations
14.
Ueda, Marehiko, Hiroshi Tada, Kenji Kurosaki, et al.. (2005). Pulmonary Vein Morphology Before and After Segmental Isolation in Patients with Atrial Fibrillation. Pacing and Clinical Electrophysiology. 28(9). 944–953. 9 indexed citations
15.
Kikugawa, Kiyomi, et al.. (2003). Effect of Supplementation of n-3 Polyunsaturated Fatty Acids on Oxidative Stress-Induced DNA Damage of Rat Hepatocytes. Biological and Pharmaceutical Bulletin. 26(9). 1239–1244. 21 indexed citations
16.
Inoue, Tomio, Noboru Oriuchi, Keiko Koyama, et al.. (2001). Usefulness of dual-head coincidence gamma camera with thick nal crystals for nuclear oncology: Comparison with dedicated PET camera and conventional gamma camera with thin NaI crystals. Annals of Nuclear Medicine. 15(2). 141–148. 6 indexed citations
17.
Takahashi, Yoshitomo, et al.. (1998). Suicide in Japan: Present State and Future Directions for Prevention. Transcultural Psychiatry. 35(2). 271–289. 22 indexed citations
18.
Takahashi, Yoshitomo, et al.. (1995). Suicide and Aging in Japan: An Examination of Treated Elderly Suicide Attempters. International Psychogeriatrics. 7(2). 239–251. 50 indexed citations
19.
Inoue, Masayasu & Keiko Koyama. (1994). [32] In vivo determination of superoxide and vitamin C radicals using cytochrome c and superoxide dismutase derivatives. Methods in enzymology on CD-ROM/Methods in enzymology. 234. 338–343. 4 indexed citations
20.
Koyama, Keiko, et al.. (1993). Clinical Study of Sleep‐Wake Disturbance in Demented Patients. Psychiatry and Clinical Neurosciences. 47(2). 447–448. 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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