Keiji Nihei

111 papers and 2.2k indexed citations i.

About

Keiji Nihei is a scholar working on Pulmonary and Respiratory Medicine, Radiation and Surgery. According to data from OpenAlex, Keiji Nihei has authored 111 papers receiving a total of 2.2k indexed citations (citations by other indexed papers that have themselves been cited), including 62 papers in Pulmonary and Respiratory Medicine, 44 papers in Radiation and 38 papers in Surgery. Recurrent topics in Keiji Nihei’s work include Advanced Radiotherapy Techniques (34 papers), Lung Cancer Diagnosis and Treatment (21 papers) and Esophageal Cancer Research and Treatment (18 papers). Keiji Nihei is often cited by papers focused on Advanced Radiotherapy Techniques (34 papers), Lung Cancer Diagnosis and Treatment (21 papers) and Esophageal Cancer Research and Treatment (18 papers). Keiji Nihei collaborates with scholars based in Japan, United States and Singapore. Keiji Nihei's co-authors include Takashi Ogino, Satoshi Ishikura, Atsushi Ohtsu, Manabu Muto, Masakatsu Onozawa, Ikuya Nonaka, Yasutoshi Koga, Yu‐ichi Goto, Satoshi Horai and Masanori Kobayashi and has published in prestigious journals such as Journal of Clinical Oncology, Neurology and Scientific Reports.

In The Last Decade

Co-authorship network of co-authors of Keiji Nihei

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

Fields of papers citing papers by Keiji Nihei

Since Specialization
Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Countries citing papers authored by Keiji Nihei

Since Specialization
Citations

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

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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2026