2026 Hiroshi Imai: Mathematics Researcher – H-Index, Publications & Awards

D-Index & Metrics

Discipline name	D-Index	World Ranking	Current World Ranking	National Ranking	Current National Ranking	Publications	Citations
Mathematics	41	1932	1691	28	24	208	6245
Engineering and Technology	42	6588	6363	135	132	240	6766

Discipline name

D-Index

World Ranking

Current World Ranking

National Ranking

Current National Ranking

Publications

Citations

Mathematics

1932

1691

208

6245

Engineering and Technology

6588

6363

135

132

240

6766

Mathematics

D-Index

Citations

6245

World Ranking

1932

National Ranking

Engineering and Technology

D-Index

Citations

6766

World Ranking

6588

National Ranking

135

Overview

Hiroshi Imai is affiliated with the University of Tokyo in Japan and has a research portfolio spanning physics, astronomy, and medicine. They focus primarily on interdisciplinary studies involving astrophysics, neuroimaging, and advanced MRI techniques.

The main fields of their work include:

Physics and Astronomy
Medicine

Within these, they have significant contributions in several subfields of study:

Astronomy and Astrophysics
Radiology, Nuclear Medicine and Imaging
Instrumentation
Artificial Intelligence
Nuclear and High Energy Physics

Their research topics cover a range of areas, including:

Stellar, planetary, and galactic studies
Astrophysics and Star Formation Studies
MRI in cancer diagnosis
Astronomy and Astrophysical Research
Advanced Neuroimaging Techniques and Applications
Gamma-ray bursts and supernovae
Advanced MRI Techniques and Applications

Hiroshi Imai's publication record includes papers featured in venues such as the Proceedings of the International Astronomical Union, arXiv, and the Publications of the Astronomical Society of Japan among others. Frequent publication venues include:

Proceedings of the International Astronomical Union
arXiv (Cornell University)
Proceedings on CD-ROM - International Society for Magnetic Resonance in Medicine. Scientific Meeting and Exhibition
Publications of the Astronomical Society of Japan
Monthly Notices of the Royal Astronomical Society

Recent peer-reviewed papers authored or coauthored by Hiroshi Imai include:

"GASKAP-HI pilot survey science I: ASKAP zoom observations of Hi emission in the Small Magellanic Cloud," 2022, Publications of the Astronomical Society of Australia
"Differentiating brain metastasis from glioblastoma by time-dependent diffusion MRI," 2023, Cancer Imaging
"Extracellular volume fraction with MRI: As an alternative predictive biomarker to dynamic contrast-enhanced MRI for chemotherapy response of pancreatic ductal adenocarcinoma," 2021, European Journal of Radiology
"Observational identification of a sample of likely recent common-envelope events," 2021, Nature Astronomy
"GASKAP-HI Pilot Survey Science III: An unbiased view of cold gas in the Small Magellanic Cloud," 2022, Publications of the Astronomical Society of Australia

Their frequent coauthors include:

José F. Gómez
Lucero Uscanga
Daniel Tafoya
Gábor Orosz
Takashi Yoshiura

Best Publications

Applications of weighted Voronoi diagrams and randomization to variance-based k-clustering: (extended abstract)

Mary Inaba;Naoki Katoh;Hiroshi Imai

449
Citations
VORONOI DIAGRAM IN THE LAGUERRE GEOMETRY AND ITS APPLICATIONS

Hiroshi Imai;Masao Iri;Kazuo Murota

325
Citations
Visibility of disjoint polygons

Takao Asano;Tetsuo Asano;Leonidas Guibas;John Hershberger

319
Citations
Polygonal Approximations of a Curve — Formulations and Algorithms

Hiroshi Imai;Masao Iri

274
Citations
Computational-geometric methods for polygonal approximations of a curve

Hiroshi Imai;Masao Iri

247
Citations
Finding the connected components and a maximum clique of an intersection graph of rectangles in the plane

Hiroshi Imai;Takao Asano

235
Citations
Biological sequence compression algorithms.

Toshiko Matsumoto;Kunihiko Sadakane;Hiroshi Imai

210
Citations
Finding k points with minimum diameter and related problems

Alok Aggarwal;Hiroshi Imai;Naoki Katoh;Subhash Suri

206
Citations
A fibre bundle over manifolds of quantum channels and its application to quantum statistics

Akio Fujiwara;Hiroshi Imai

203
Citations
Visibility-polygon search and euclidean shortest paths

Takao Asano;Tetsuo Asano;Leonidas Guibas;John Hershberger

190
Citations
A fast algorithm for finding better routes by AI search techniques

T. Ikeda;Min-Yao Hsu;H. Imai;S. Nishimura

170
Citations
Efficient algorithms for geometric graph search problems

Hiroshi Imai;Takao Asano

147
Citations
Phase-covariant quantum cloning of qudits

Heng Fan;Hiroshi Imai;Keiji Matsumoto;Xiang-Bin Wang

143
Citations
Quantum parameter estimation of a generalized Pauli channel

Akio Fujiwara;Hiroshi Imai

142
Citations
Practical use of Bucketing Techniques in Computational Geometry

Takao Asano;Masato Edahiro;Hiroshi Imai;Masao Iri

141
Citations
An optimal algorithm for approximating a piecewise linear function

H. Imai;Masao Iri

141
Citations
Classification of Various Neighborhood Operations for the Nurse Scheduling Problem

Takayumi Osogami;Hiroshi Imai

120
Citations
Computing the Tutte Polynomial of a Graph of Moderate Size

Kyoko Sekine;Hiroshi Imai;Seiichiro Tani

112
Citations
A multiplicative barrier function method for linear programming

Masao Iri;Hiroshi Imai

102
Citations
Direct observation shows superposition and large scale flexibility within cytoplasmic dynein motors moving along microtubules.

Hiroshi Imai;Tomohiro Shima;Kazuo Sutoh;Matthew L. Walker

95
Citations
Partitioning a polygonal region into trapezoids

Takao Asano;Tetsuo Asano;Hiroshi Imai

91
Citations

Frequent Co-Authors

David Avis McGill University

Masaru Kitsuregawa University of Tokyo

Naoki Katoh University of Hyogo

Kunihiko Sadakane University of Tokyo

Masahito Hayashi Chinese University of Hong Kong, Shenzhen

Takao Nishizeki Tohoku University

Franz Aurenhammer Graz University of Technology

Der-Tsai Lee Academia Sinica

Toshihide Ibaraki Kyoto College of Graduate Studies for Informatics

Kazuo Murota Tokyo Metropolitan University

External Links

Personal website of Hiroshi Imai

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