World's Best Scientists 2026 revealed!
Hiroshi Imai

Hiroshi Imai

D-Index & Metrics

Mathematics

D-Index
41
Citations
6245
World Ranking
1932
National Ranking
28

Engineering and Technology

D-Index
42
Citations
6766
World Ranking
6591
National Ranking
135

Hiroshi Imai publication distribution in Mathematics in 2026

The chart shows the distribution of publications by all Research.com ranked scientists in the field of Mathematics in 2026. The highlighted bar marks where Hiroshi Imai sits on this spectrum.

42–46 publications: 3 scientists 47–51 publications: 5 scientists 52–56 publications: 7 scientists 57–61 publications: 20 scientists 62–66 publications: 14 scientists 67–71 publications: 25 scientists 72–76 publications: 19 scientists 77–81 publications: 35 scientists 82–86 publications: 50 scientists 87–91 publications: 60 scientists 92–96 publications: 86 scientists 97–101 publications: 84 scientists 102–106 publications: 83 scientists 107–111 publications: 90 scientists 112–116 publications: 99 scientists 117–121 publications: 90 scientists 122–126 publications: 91 scientists 127–131 publications: 109 scientists 132–136 publications: 110 scientists 137–141 publications: 98 scientists 142–146 publications: 112 scientists 147–151 publications: 102 scientists 152–156 publications: 88 scientists 157–161 publications: 106 scientists 162–166 publications: 83 scientists 167–171 publications: 102 scientists 172–176 publications: 77 scientists 177–181 publications: 81 scientists 182–186 publications: 78 scientists 187–191 publications: 71 scientists 192–196 publications: 92 scientists 197–201 publications: 64 scientists 202–206 publications: 69 scientists 207–211 publications: 64 scientists 212–216 publications: 62 scientists 217–221 publications: 58 scientists 222–226 publications: 53 scientists 227–231 publications: 50 scientists 232–236 publications: 46 scientists 237–241 publications: 46 scientists 242–246 publications: 46 scientists 247–251 publications: 43 scientists 252–256 publications: 29 scientists 257–261 publications: 45 scientists 262–266 publications: 30 scientists 267–271 publications: 33 scientists 272–276 publications: 34 scientists 277–281 publications: 30 scientists 282–286 publications: 31 scientists 287–291 publications: 21 scientists 292–296 publications: 34 scientists 297–301 publications: 26 scientists 302–306 publications: 10 scientists 307–311 publications: 17 scientists 312–316 publications: 23 scientists 317–321 publications: 13 scientists 322–326 publications: 16 scientists 327–331 publications: 26 scientists 332–336 publications: 13 scientists 337–341 publications: 13 scientists 342–346 publications: 16 scientists 347–351 publications: 17 scientists 352–356 publications: 12 scientists 357–361 publications: 18 scientists 362–366 publications: 18 scientists 367–371 publications: 9 scientists 372–376 publications: 11 scientists 377–381 publications: 8 scientists 382–386 publications: 8 scientists 387–391 publications: 9 scientists 392–396 publications: 9 scientists 397–401 publications: 8 scientists 402–406 publications: 11 scientists 407–411 publications: 6 scientists 412–416 publications: 6 scientists 417–421 publications: 9 scientists 422–426 publications: 8 scientists 427–431 publications: 5 scientists 432–436 publications: 8 scientists 437–441 publications: 8 scientists 442–446 publications: 4 scientists 447–451 publications: 4 scientists 452–456 publications: 4 scientists 457–461 publications: 2 scientists 462–466 publications: 2 scientists 467–471 publications: 4 scientists 472–476 publications: 3 scientists 477–481 publications: 3 scientists 482–486 publications: 6 scientists 487–491 publications: 3 scientists 492–496 publications: 5 scientists 497–501 publications: 5 scientists 502–506 publications: 1 scientists 507–511 publications: 6 scientists 512–516 publications: 4 scientists 517–521 publications: 1 scientists 522–526 publications: 3 scientists 527–531 publications: 1 scientists 532–536 publications: 4 scientists 537+ publications: 100 scientists
42 publications 537+

This scientist: 208 publications — 65th percentile

65% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 537 publications or more.

Hiroshi Imai D-index placement in Mathematics in 2026

The chart shows the D-index (discipline H-index) distribution of Mathematics scientists ranked by Research.com in 2026. The highlighted bar marks where Hiroshi Imai sits on this spectrum.

30 D-Index: 174 scientists 31 D-Index: 151 scientists 32 D-Index: 174 scientists 33 D-Index: 117 scientists 34 D-Index: 136 scientists 35 D-Index: 127 scientists 36 D-Index: 145 scientists 37 D-Index: 153 scientists 38 D-Index: 150 scientists 39 D-Index: 150 scientists 40 D-Index: 138 scientists 41 D-Index: 136 scientists 42 D-Index: 93 scientists 43 D-Index: 108 scientists 44 D-Index: 115 scientists 45 D-Index: 112 scientists 46 D-Index: 103 scientists 47 D-Index: 75 scientists 48 D-Index: 59 scientists 49 D-Index: 67 scientists 50 D-Index: 60 scientists 51 D-Index: 57 scientists 52 D-Index: 59 scientists 53 D-Index: 62 scientists 54 D-Index: 60 scientists 55 D-Index: 50 scientists 56 D-Index: 42 scientists 57 D-Index: 54 scientists 58 D-Index: 50 scientists 59 D-Index: 42 scientists 60 D-Index: 41 scientists 61 D-Index: 35 scientists 62 D-Index: 40 scientists 63 D-Index: 21 scientists 64 D-Index: 31 scientists 65 D-Index: 27 scientists 66 D-Index: 29 scientists 67 D-Index: 19 scientists 68 D-Index: 25 scientists 69 D-Index: 17 scientists 70 D-Index: 18 scientists 71 D-Index: 12 scientists 72 D-Index: 14 scientists 73 D-Index: 13 scientists 74 D-Index: 18 scientists 75 D-Index: 9 scientists 76 D-Index: 11 scientists 77 D-Index: 10 scientists 78 D-Index: 9 scientists 79 D-Index: 16 scientists 80 D-Index: 12 scientists 81 D-Index: 10 scientists 82 D-Index: 5 scientists 83 D-Index: 5 scientists 84 D-Index: 13 scientists 85 D-Index: 6 scientists 86+ D-Index: 99 scientists
30 D-Index 86+

This scientist: 41 D-Index — 49th percentile

49% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 86 D-Index or more.

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

  • VORONOI DIAGRAM IN THE LAGUERRE GEOMETRY AND ITS APPLICATIONS

    Hiroshi Imai;Masao Iri;Kazuo Murota

  • Visibility of disjoint polygons

    Takao Asano;Tetsuo Asano;Leonidas Guibas;John Hershberger

  • Polygonal Approximations of a Curve — Formulations and Algorithms

    Hiroshi Imai;Masao Iri

  • Computational-geometric methods for polygonal approximations of a curve

    Hiroshi Imai;Masao Iri

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

    Hiroshi Imai;Takao Asano

  • Biological sequence compression algorithms.

    Toshiko Matsumoto;Kunihiko Sadakane;Hiroshi Imai

  • Finding k points with minimum diameter and related problems

    Alok Aggarwal;Hiroshi Imai;Naoki Katoh;Subhash Suri

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

    Akio Fujiwara;Hiroshi Imai

  • Visibility-polygon search and euclidean shortest paths

    Takao Asano;Tetsuo Asano;Leonidas Guibas;John Hershberger

  • A fast algorithm for finding better routes by AI search techniques

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

  • Efficient algorithms for geometric graph search problems

    Hiroshi Imai;Takao Asano

  • Phase-covariant quantum cloning of qudits

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

  • Quantum parameter estimation of a generalized Pauli channel

    Akio Fujiwara;Hiroshi Imai

  • Practical use of Bucketing Techniques in Computational Geometry

    Takao Asano;Masato Edahiro;Hiroshi Imai;Masao Iri

  • An optimal algorithm for approximating a piecewise linear function

    H. Imai;Masao Iri

  • Classification of Various Neighborhood Operations for the Nurse Scheduling Problem

    Takayumi Osogami;Hiroshi Imai

  • Computing the Tutte Polynomial of a Graph of Moderate Size

    Kyoko Sekine;Hiroshi Imai;Seiichiro Tani

  • A multiplicative barrier function method for linear programming

    Masao Iri;Hiroshi Imai

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

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

  • Partitioning a polygonal region into trapezoids

    Takao Asano;Tetsuo Asano;Hiroshi Imai

Frequent Co-Authors

David Avis
David Avis McGill University
Masaru Kitsuregawa
Masaru Kitsuregawa University of Tokyo
Naoki Katoh
Naoki Katoh University of Hyogo
Kunihiko Sadakane
Kunihiko Sadakane University of Tokyo
Masahito Hayashi
Masahito Hayashi Chinese University of Hong Kong, Shenzhen
Takao Nishizeki
Takao Nishizeki Tohoku University
Franz Aurenhammer
Franz Aurenhammer Graz University of Technology
Der-Tsai Lee
Der-Tsai Lee Academia Sinica
Toshihide Ibaraki
Toshihide Ibaraki Kyoto College of Graduate Studies for Informatics
Kazuo Murota
Kazuo Murota Tokyo Metropolitan University

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