Ryoji Ichijima

681 total citations · 1 hit paper
38 papers, 449 citations indexed

About

Ryoji Ichijima is a scholar working on Surgery, Pulmonary and Respiratory Medicine and Gastroenterology. According to data from OpenAlex, Ryoji Ichijima has authored 38 papers receiving a total of 449 indexed citations (citations by other indexed papers that have themselves been cited), including 24 papers in Surgery, 22 papers in Pulmonary and Respiratory Medicine and 19 papers in Gastroenterology. Recurrent topics in Ryoji Ichijima's work include Gastric Cancer Management and Outcomes (18 papers), Metastasis and carcinoma case studies (10 papers) and Gastrointestinal Tumor Research and Treatment (10 papers). Ryoji Ichijima is often cited by papers focused on Gastric Cancer Management and Outcomes (18 papers), Metastasis and carcinoma case studies (10 papers) and Gastrointestinal Tumor Research and Treatment (10 papers). Ryoji Ichijima collaborates with scholars based in Japan, United States and Taiwan. Ryoji Ichijima's co-authors include Hisatomo Ikehara, Sho Suzuki, Chika Kusano, Takuji Gotoda, Koichi Kawabe, Masashi Kawamura, Hirotaka Ito, Masahiko Ohtaka, Motoki Ohyauchi and Yohei Ogata and has published in prestigious journals such as SHILAP Revista de lepidopterología, Gastroenterology and Gut.

In The Last Decade

Ryoji Ichijima

36 papers receiving 448 citations

Hit Papers

align trajectories

What are hit papers?

Hit papers significantly outperform the citation benchmark for their cohort. A paper qualifies if it has ≥500 total citations, achieves ≥1.5× the top-1% citation threshold for papers in the same subfield and year (this is the minimum needed to enter the top 1%, not the average within it), or reaches the top citation threshold in at least one of its specific research topics.

Seven-day vonoprazan and low-dose amoxicillin dual therapy as first-line Helicobacter pylori treatment: a multicentre randomised trial in Japan

2020 167 citations Sho Suzuki, Takuji Gotoda et al. Gut profile →

Peers

Countries citing papers authored by Ryoji Ichijima

Since Specialization

Citations

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

Fields of papers citing papers by Ryoji Ichijima

Since Specialization

Physical SciencesHealth SciencesLife SciencesSocial Sciences

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

Co-authorship network of co-authors of Ryoji Ichijima

This figure shows the co-authorship network connecting the top 25 collaborators of Ryoji Ichijima. A scholar is included among the top collaborators of Ryoji Ichijima 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 Ryoji Ichijima. Ryoji Ichijima 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	Efficacy and safety of remimazolam for sedation during endoscopic procedures in Japanese: A prospective phase III clinical trial 2025 ·Digestive Endoscopy ·Hisatomo Ikehara, Ryoji Ichijima, Yoji Takeuchi, Jun Kanazawa, Takuya Wada, Kosuke Okuwaki, (unknown), Hirofumi Kogure, Chika Kusano, Hiroyuki Ono	1
2	Comparative Study of Remimazolam and Midazolam During Sedated Upper Gastrointestinal Endoscopy: A Propensity Score Matching Analysis 2025 ·JGH Open ·Ryoji Ichijima, Hisatomo Ikehara, (unknown), Daisuke Yamaguchi, Yasuhiko Nagata, Kanako Ogura, Mitsuru Esaki, Yosuke Minoda, Hiroyuki Ono, (unknown), Shinsuke Kiriyama, Tetsuya Sumiyoshi, Yuichi Kanmura	0
3	Usefulness and safety of remimazolam in upper gastrointestinal endoscopy: A comparative study between elderly and non‐elderly patients 2025 ·DEN Open ·Ryoji Ichijima, Hisatomo Ikehara, Daisuke Yamaguchi, Yasuhiko Nagata, Kanako Ogura, Mitsuru Esaki, Yosuke Minoda, Hiroyuki Ono, (unknown), Shinsuke Kiriyama, Tetsuya Sumiyoshi, Yuichi Kanmura	0
4	COMPARISON BETWEEN REMIMAZOLAM AND PLACEBO IN JAPANESE PATIENTS UNDERGOING COLONOSCOPY: A PHASE III, INVESTIGATOR-INITIATED, RANDOMIZED, CONTROLLED TRIAL 2024 ·Gastrointestinal Endoscopy ·Daisuke Yamaguchi, Ryoji Ichijima, Hisatomo Ikehara, Hiroyuki Ono, Kinichi Hotta, (unknown), Yosuke Minoda, Yasuhiko Nagata, Kanako Ogura, Shinsuke Kiriyama, Tetsuya Sumiyoshi, Yuichi Kanmura	1
5	COMPARISON BETWEEN REMIMAZOLAM AND PLACEBO IN JAPANESE PATIENTS UNDERGOING COLONOSCOPY: A PHASE III, INVESTIGATOR-INITIATED, RANDOMIZED, CONTROLLED TRIAL 2024 ·Gastrointestinal Endoscopy ·Daisuke Yamaguchi, Ryoji Ichijima, Hisatomo Ikehara, Hiroyuki Ono, Kinichi Hotta, (unknown), Yosuke Minoda, Yasuhiko Nagata, Kanako Ogura, Shinsuke Kiriyama, Tetsuya Sumiyoshi, Yuichi Kanmura	1
6	Randomized Controlled Trial of Remimazolam Compared with Placebo in Japanese Patients Undergoing Colonoscopy: A Phase III, Investigator-Initiated Trial 2024 ·Digestion ·Ryoji Ichijima, Hisatomo Ikehara, Hiroyuki Ono, Kinichi Hotta, Daisuke Yamaguchi, Mitsuru Esaki, Yosuke Minoda, Yasuhiko Nagata, Kanako Ogura, Shinsuke Kiriyama, Tetsuya Sumiyoshi, Yuichi Kanmura	3
7	Randomized controlled trial of remimazolam compared with placebo in Japanese patients undergoing upper gastrointestinal endoscopy: Phase III investigator‐initiated clinical trial 2024 ·Digestive Endoscopy ·Ryoji Ichijima, Hisatomo Ikehara, Daisuke Yamaguchi, Yasuhiko Nagata, Kanako Ogura, Mitsuru Esaki, Yosuke Minoda, Hiroyuki Ono, (unknown), Shinsuke Kiriyama, Tetsuya Sumiyoshi, Yuichi Kanmura, Takuji Gotoda	7
8	Efficacy and timing of gastrografin administration after ileus tube insertion in patients with adhesive small bowel obstruction 2022 ·Arab Journal of Gastroenterology ·Mitsuru Esaki, (unknown), Ryoji Ichijima, Sho Suzuki, (unknown), Yosuke Minoda, Mitsuhiko Moriyama, Takuji Gotoda	2
9	Self-completion method of endoscopic submucosal dissection using the Endosaber for treating colorectal neoplasms (with video) 2022 ·Scientific Reports ·Mitsuru Esaki, (unknown), Ryoji Ichijima, Sho Suzuki, Chika Kusano, Hisatomo Ikehara, Yosuke Minoda, Eikichi Ihara, Takuji Gotoda	2
10	Diagnostic Ability of High-definition Imaging Using Ultraslim Endoscopes in Early Gastric Cancer 2021 ·Journal of the Korean Gastric Cancer Association ·(unknown), Sho Suzuki, Ryoji Ichijima, Kanako Ogura, Chika Kusano, Hisatomo Ikehara, Takuji Gotoda, Mitsuhiko Moriyama	1
11	Impact of body size on first‐line Helicobacter pylori eradication success using vonoprazan and amoxicillin dual therapy 2021 ·Helicobacter ·Hiroyuki Eto, Sho Suzuki, Chika Kusano, Hisatomo Ikehara, Ryoji Ichijima, Hirotaka Ito, Koichi Kawabe, Masashi Kawamura, Yoshioki Yoda, (unknown), Takuji Gotoda	31
12	The Ideal <b><i>Helicobacter pylori</i></b> Treatment for the Present and the Future 2021 ·Digestion ·Sho Suzuki, Chika Kusano, (unknown), Ryoji Ichijima, Hisatomo Ikehara	45
13	Efficacy and safety of grasping forceps-assisted endoscopic resection for gastric neoplasms: A multi-centre retrospective study 2021 ·World Journal of Gastrointestinal Oncology ·Ryoji Ichijima, Sho Suzuki, Mitsuru Esaki, (unknown), Chika Kusano, Hisatomo Ikehara, Takuji Gotoda	1
14	Assistant skill in gastric endoscopic submucosal dissection using a clutch cutter 2021 ·World Journal of Gastrointestinal Surgery ·Mitsuru Esaki, (unknown), Ryoji Ichijima, (unknown), (unknown), Shuichi Abe, (unknown), (unknown), K Nishioka, Yosuke Minoda, (unknown), Sho Suzuki, Hirotada Akiho, Eikichi Ihara, Yoshihiro Ogawa, Takuji Gotoda	2
15	Seven-day vonoprazan and low-dose amoxicillin dual therapy as first-line Helicobacter pylori treatment: a multicentre randomised trial in Japan breakdown → 2020 ·Gut ·Sho Suzuki, Takuji Gotoda, Chika Kusano, Hisatomo Ikehara, Ryoji Ichijima, Motoki Ohyauchi, Hirotaka Ito, Masashi Kawamura, Yohei Ogata, Masahiko Ohtaka, (unknown), Koichi Kawabe	167
16	Ex vivo porcine model study on the treatment outcomes of scissor-type knife versus needle-type knife in endoscopic submucosal dissection performed by trainees 2020 ·BMC Surgery ·Ryoji Ichijima, Mitsuru Esaki, (unknown), Yosuke Minoda, Sho Suzuki, Chika Kusano, Hisatomo Ikehara, Takuji Gotoda	3
17	Clinical impact of vonoprazan-based dual therapy with amoxicillin for H. pylori infection in a treatment-naïve cohort of junior high school students in Japan 2020 ·Journal of Gastroenterology ·Takuji Gotoda, Chika Kusano, Sho Suzuki, (unknown), Ryoji Ichijima, Hisatomo Ikehara	54
18	Self-Completion Method of Endoscopic Submucosal Dissection Using Endosaber without Any Other Device or Assistance: An ex vivo Porcine Model Study 2019 ·Digestion ·Mitsuru Esaki, Yosuke Minoda, (unknown), (unknown), (unknown), (unknown), (unknown), Ryoji Ichijima, Sho Suzuki, (unknown), (unknown), (unknown), (unknown), Eikichi Ihara, Yoshihiro Ogawa	5
19	Endoscopic submucosal dissection with Clutch Cutter using a large cap‐fitted endoscope 2019 ·Digestive Endoscopy ·Mitsuru Esaki, Ryoji Ichijima, Sho Suzuki	1
20	A double-channel cap-assisted closure of a gastric defect after endoscopic submucosal dissection 2018 ·Annals of Laparoscopic and Endoscopic Surgery ·Ryoji Ichijima, Seiichiro Abe, Ichiro Oda, Satoru Nonaka, Haruhisa Suzuki, Shigetaka Yoshinaga, Amit Bhatt, Yutaka Saito	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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