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D-Index & Metrics

Discipline name D-Index World Ranking Current World Ranking National Ranking Current National Ranking Publications Citations
Neuroscience 63 3411 3121 95 91 401 12801

Nobuyuki Okamura publications per year

The chart shows the history of publications by Nobuyuki Okamura between 1990 and 2025, highlighting the no. of papers published in each year and offering an overview of the publication velocity of this scholar. Nobuyuki Okamura published across 36 years, from 1990 to 2025, averaging 12.1 papers a year. Output peaked at 33 publications in 2017. 15 of the 437 publications appeared in the last two years.

No. of publications
10 20 30
Bar chart. Horizontal axis: year, 1990 to 2025. Vertical axis: number of publications, 0 to 33. Peak 33 publications in 2017. 1990: 1 publication 1991: 2 publications 1992: 1 publication 1993: 1 publication 1994: 1 publication 1995: 0 publications 1996: 3 publications 1997: 3 publications 1998: 4 publications 1999: 7 publications 2000: 16 publications 2001: 7 publications 2002: 8 publications 2003: 6 publications 2004: 11 publications 2005: 4 publications 2006: 9 publications 2007: 13 publications 2008: 19 publications 2009: 20 publications 2010: 25 publications 2011: 24 publications 2012: 19 publications 2013: 24 publications 2014: 18 publications 2015: 18 publications 2016: 28 publications 2017: 33 publications 2018: 29 publications 2019: 8 publications 2020: 11 publications 2021: 19 publications 2022: 15 publications 2023: 15 publications 2024: 6 publications 2025: 9 publications
1990 2025

437 publications in total across all disciplines

View publications per year as a table
Nobuyuki Okamura: publications per year, 1990 to 2025
Year Publications
1990 1
1991 2
1992 1
1993 1
1994 1
1995 0
1996 3
1997 3
1998 4
1999 7
2000 16
2001 7
2002 8
2003 6
2004 11
2005 4
2006 9
2007 13
2008 19
2009 20
2010 25
2011 24
2012 19
2013 24
2014 18
2015 18
2016 28
2017 33
2018 29
2019 8
2020 11
2021 19
2022 15
2023 15
2024 6
2025 9
Total 437
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Nobuyuki Okamura publication distribution in Neuroscience in 2026

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

No. of scientists
100 200 300 400 500
Bar chart with 86 bars. Horizontal axis: publications, 38–47 to 887+. Vertical axis: number of scientists, 0 to 539. Most scientists, 539, have 98–107 publications. The last bar groups every scientist with 887 publications or more. The highlighted bar, 398–407 publications, is where this scientist sits. 38–47 publications: 18 scientists 48–57 publications: 79 scientists 58–67 publications: 193 scientists 68–77 publications: 323 scientists 78–87 publications: 406 scientists 88–97 publications: 452 scientists 98–107 publications: 539 scientists 108–117 publications: 505 scientists 118–127 publications: 522 scientists 128–137 publications: 469 scientists 138–147 publications: 456 scientists 148–157 publications: 459 scientists 158–167 publications: 397 scientists 168–177 publications: 383 scientists 178–187 publications: 350 scientists 188–197 publications: 302 scientists 198–207 publications: 306 scientists 208–217 publications: 262 scientists 218–227 publications: 242 scientists 228–237 publications: 220 scientists 238–247 publications: 203 scientists 248–257 publications: 174 scientists 258–267 publications: 176 scientists 268–277 publications: 175 scientists 278–287 publications: 125 scientists 288–297 publications: 116 scientists 298–307 publications: 127 scientists 308–317 publications: 128 scientists 318–327 publications: 99 scientists 328–337 publications: 89 scientists 338–347 publications: 78 scientists 348–357 publications: 96 scientists 358–367 publications: 66 scientists 368–377 publications: 59 scientists 378–387 publications: 65 scientists 388–397 publications: 54 scientists 398–407 publications: 48 scientists 408–417 publications: 49 scientists 418–427 publications: 34 scientists 428–437 publications: 31 scientists 438–447 publications: 30 scientists 448–457 publications: 31 scientists 458–467 publications: 36 scientists 468–477 publications: 40 scientists 478–487 publications: 35 scientists 488–497 publications: 30 scientists 498–507 publications: 23 scientists 508–517 publications: 26 scientists 518–527 publications: 20 scientists 528–537 publications: 23 scientists 538–547 publications: 20 scientists 548–557 publications: 20 scientists 558–567 publications: 17 scientists 568–577 publications: 14 scientists 578–587 publications: 20 scientists 588–597 publications: 20 scientists 598–607 publications: 19 scientists 608–617 publications: 18 scientists 618–627 publications: 17 scientists 628–637 publications: 11 scientists 638–647 publications: 11 scientists 648–657 publications: 11 scientists 658–667 publications: 8 scientists 668–677 publications: 7 scientists 678–687 publications: 11 scientists 688–697 publications: 10 scientists 698–707 publications: 4 scientists 708–717 publications: 6 scientists 718–727 publications: 5 scientists 728–737 publications: 5 scientists 738–747 publications: 9 scientists 748–757 publications: 9 scientists 758–767 publications: 3 scientists 768–777 publications: 7 scientists 778–787 publications: 7 scientists 788–797 publications: 6 scientists 798–807 publications: 2 scientists 808–817 publications: 2 scientists 818–827 publications: 7 scientists 828–837 publications: 0 scientists 838–847 publications: 9 scientists 848–857 publications: 3 scientists 858–867 publications: 1 scientist 868–877 publications: 3 scientists 878–886 publications: 6 scientists 887+ publications: 100 scientists
38–47 publications 887+

This scientist: 401 publications — 91st percentile

91% of scientists in this discipline score the same or lower.

The last bar groups every scientist with 887 publications or more.

View publications distribution as a table
Number of Neuroscience scientists by publication count, Research.com 2026 ranking edition. Based on 9,597 ranked scientists.
Publications Scientists This scientist
38–47 18
48–57 79
58–67 193
68–77 323
78–87 406
88–97 452
98–107 539
108–117 505
118–127 522
128–137 469
138–147 456
148–157 459
158–167 397
168–177 383
178–187 350
188–197 302
198–207 306
208–217 262
218–227 242
228–237 220
238–247 203
248–257 174
258–267 176
268–277 175
278–287 125
288–297 116
298–307 127
308–317 128
318–327 99
328–337 89
338–347 78
348–357 96
358–367 66
368–377 59
378–387 65
388–397 54
398–407 48 401
408–417 49
418–427 34
428–437 31
438–447 30
448–457 31
458–467 36
468–477 40
478–487 35
488–497 30
498–507 23
508–517 26
518–527 20
528–537 23
538–547 20
548–557 20
558–567 17
568–577 14
578–587 20
588–597 20
598–607 19
608–617 18
618–627 17
628–637 11
638–647 11
648–657 11
658–667 8
668–677 7
678–687 11
688–697 10
698–707 4
708–717 6
718–727 5
728–737 5
738–747 9
748–757 9
758–767 3
768–777 7
778–787 7
788–797 6
798–807 2
808–817 2
818–827 7
828–837 0
838–847 9
848–857 3
858–867 1
868–877 3
878–886 6
887+ 100
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Nobuyuki Okamura D-index placement in Neuroscience in 2026

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

No. of scientists
100 200 300 400 500
Bar chart with 68 bars. Horizontal axis: D-Index, 30–31 to 163+. Vertical axis: number of scientists, 0 to 512. Most scientists, 512, have 46–47 D-Index. The last bar groups every scientist with 163 D-Index or more. The highlighted bar, 62–63 D-Index, is where this scientist sits. 30–31 D-Index: 42 scientists 32–33 D-Index: 172 scientists 34–35 D-Index: 296 scientists 36–37 D-Index: 435 scientists 38–39 D-Index: 459 scientists 40–41 D-Index: 456 scientists 42–43 D-Index: 467 scientists 44–45 D-Index: 478 scientists 46–47 D-Index: 512 scientists 48–49 D-Index: 435 scientists 50–51 D-Index: 425 scientists 52–53 D-Index: 418 scientists 54–55 D-Index: 392 scientists 56–57 D-Index: 357 scientists 58–59 D-Index: 334 scientists 60–61 D-Index: 328 scientists 62–63 D-Index: 260 scientists 64–65 D-Index: 278 scientists 66–67 D-Index: 239 scientists 68–69 D-Index: 250 scientists 70–71 D-Index: 210 scientists 72–73 D-Index: 200 scientists 74–75 D-Index: 189 scientists 76–77 D-Index: 170 scientists 78–79 D-Index: 146 scientists 80–81 D-Index: 113 scientists 82–83 D-Index: 126 scientists 84–85 D-Index: 100 scientists 86–87 D-Index: 84 scientists 88–89 D-Index: 99 scientists 90–91 D-Index: 84 scientists 92–93 D-Index: 85 scientists 94–95 D-Index: 72 scientists 96–97 D-Index: 76 scientists 98–99 D-Index: 45 scientists 100–101 D-Index: 49 scientists 102–103 D-Index: 43 scientists 104–105 D-Index: 32 scientists 106–107 D-Index: 45 scientists 108–109 D-Index: 50 scientists 110–111 D-Index: 32 scientists 112–113 D-Index: 39 scientists 114–115 D-Index: 32 scientists 116–117 D-Index: 29 scientists 118–119 D-Index: 27 scientists 120–121 D-Index: 19 scientists 122–123 D-Index: 23 scientists 124–125 D-Index: 27 scientists 126–127 D-Index: 16 scientists 128–129 D-Index: 24 scientists 130–131 D-Index: 13 scientists 132–133 D-Index: 21 scientists 134–135 D-Index: 17 scientists 136–137 D-Index: 14 scientists 138–139 D-Index: 15 scientists 140–141 D-Index: 10 scientists 142–143 D-Index: 10 scientists 144–145 D-Index: 13 scientists 146–147 D-Index: 9 scientists 148–149 D-Index: 8 scientists 150–151 D-Index: 6 scientists 152–153 D-Index: 6 scientists 154–155 D-Index: 7 scientists 156–157 D-Index: 7 scientists 158–159 D-Index: 10 scientists 160–161 D-Index: 4 scientists 162 D-Index: 8 scientists 163+ D-Index: 100 scientists
30–31 D-Index 163+

This scientist: 63 D-Index — 65th percentile

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

The last bar groups every scientist with 163 D-Index or more.

View D-Index distribution as a table
Number of Neuroscience scientists by D-index, Research.com 2026 ranking edition. Based on 9,597 ranked scientists.
D-Index Scientists This scientist
30–31 42
32–33 172
34–35 296
36–37 435
38–39 459
40–41 456
42–43 467
44–45 478
46–47 512
48–49 435
50–51 425
52–53 418
54–55 392
56–57 357
58–59 334
60–61 328
62–63 260 63
64–65 278
66–67 239
68–69 250
70–71 210
72–73 200
74–75 189
76–77 170
78–79 146
80–81 113
82–83 126
84–85 100
86–87 84
88–89 99
90–91 84
92–93 85
94–95 72
96–97 76
98–99 45
100–101 49
102–103 43
104–105 32
106–107 45
108–109 50
110–111 32
112–113 39
114–115 32
116–117 29
118–119 27
120–121 19
122–123 23
124–125 27
126–127 16
128–129 24
130–131 13
132–133 21
134–135 17
136–137 14
138–139 15
140–141 10
142–143 10
144–145 13
146–147 9
148–149 8
150–151 6
152–153 6
154–155 7
156–157 7
158–159 10
160–161 4
162 8
163+ 100
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Overview

Nobuyuki Okamura is affiliated with Tohoku Medical and Pharmaceutical University in Japan and has contributed extensively to research in medicine and neuroscience, with a particular focus on neurology, physiology, and cellular and molecular neuroscience. Their work spans several interconnected fields including psychiatry and mental health, as well as radiology, nuclear medicine, and imaging.

Their primary research topics encompass Alzheimer's disease research and treatments, neuroscience and neuropharmacology research, dementia and cognitive impairment research, and neuroinflammation and neurodegeneration mechanisms. Additional areas include Parkinson's disease mechanisms and treatments, cerebrospinal fluid and hydrocephalus, and sleep and wakefulness research.

Okamura has published in a variety of scientific venues, frequently contributing to:

  • Proceedings for Annual Meeting of The Japanese Pharmacological Society
  • Nuclear Medicine and Biology
  • Alzheimer's & Dementia
  • Scientific Reports
  • Journal of Nuclear Medicine

Their recent papers highlight several advances in neuroimaging and neurodegenerative disease studies, including:

  • "Decreased CSF clearance and increased brain amyloid in Alzheimer's disease" (2022), published in Fluids and Barriers of the CNS
  • "18F-SMBT-1: A Selective and Reversible PET Tracer for Monoamine Oxidase-B Imaging" (2020), published in Journal of Nuclear Medicine
  • "APOE ɛ4dose associates with increased brain iron and β-amyloid via blood-brain barrier dysfunction" (2022), published in Journal of Neurology Neurosurgery & Psychiatry
  • "First-in-Humans Evaluation of 18F-SMBT-1, a Novel 18F-Labeled Monoamine Oxidase-B PET Tracer for Imaging Reactive Astrogliosis" (2022), published in Journal of Nuclear Medicine
  • "Assessing Reactive Astrogliosis with 18F-SMBT-1 Across the Alzheimer Disease Spectrum" (2022), published in Journal of Nuclear Medicine

Among frequent co-authors are:

  • Ryuichi Harada
  • Yukitsuka Kudo
  • Shozo Furumoto
  • Kazuhiko Yanai
  • Tadaho Nakamura

The body of work by Nobuyuki Okamura is multidisciplinary, integrating advances in neuroimaging techniques and biochemical markers with studies focused on brain amyloid deposition, blood-brain barrier dysfunction, and the neurobiological underpinnings of neurodegenerative diseases.

Best Publications

  • Imaging of Tau Pathology in a Tauopathy Mouse Model and in Alzheimer Patients Compared to Normal Controls

    Masahiro Maruyama;Hitoshi Shimada;Tetsuya Suhara;Hitoshi Shinotoh

  • 18F-THK523: a novel in vivo tau imaging ligand for Alzheimer’s disease

    Michelle T Fodero-Tavoletti;Nobuyuki Okamura;Shozo Furumoto;Rachel S Mulligan

  • 18F-THK5351: A Novel PET Radiotracer for Imaging Neurofibrillary Pathology in Alzheimer Disease.

    Ryuichi Harada;Nobuyuki Okamura;Shozo Furumoto;Katsutoshi Furukawa

  • Monoamine oxidase B inhibitor, selegiline, reduces 18F-THK5351 uptake in the human brain

    Kok Pin Ng;Tharick A. Pascoal;Sulantha Mathotaarachchi;Joseph Therriault

  • Novel 18F-labeled arylquinoline derivatives for noninvasive imaging of tau pathology in Alzheimer disease.

    Nobuyuki Okamura;Shozo Furumoto;Ryuichi Harada;Tetsuro Tago

  • 2-(2-[2-Dimethylaminothiazol-5-yl]Ethenyl)-6- (2-[Fluoro]Ethoxy)Benzoxazole: A Novel PET Agent for In Vivo Detection of Dense Amyloid Plaques in Alzheimer's Disease Patients

    Yukitsuka Kudo;Nobuyuki Okamura;Shozo Furumoto;Manabu Tashiro

  • Non-invasive assessment of Alzheimer's disease neurofibrillary pathology using 18F-THK5105 PET.

    Nobuyuki Okamura;Shozo Furumoto;Michelle T. Fodero-Tavoletti;Rachel S. Mulligan

  • Glucose Hypometabolism and Neuropathological Correlates in Brains of Dementia with Lewy Bodies

    Makoto Higuchi;Manabu Tashiro;Hiroyuki Arai;Nobuyuki Okamura

  • Quinoline and Benzimidazole Derivatives: Candidate Probes for In Vivo Imaging of Tau Pathology in Alzheimer's Disease

    Nobuyuki Okamura;Takahiro Suemoto;Shozo Furumoto;Masako Suzuki

  • Cerebrospinal Fluid Clearance in Alzheimer Disease Measured with Dynamic PET.

    Mony J. de Leon;Yi Li;Nobuyuki Okamura;Wai H. Tsui

  • The development and validation of tau PET tracers: current status and future directions.

    Nobuyuki Okamura;Ryuichi Harada;Aiko Ishiki;Akio Kikuchi

  • Sleep Patterns and Mortality among Elderly Patients in a Geriatric Hospital

    K. Manabe;T. Matsui;M. Yamaya;T. Sato-Nakagawa

  • In vivo evaluation of a novel tau imaging tracer for Alzheimer’s disease

    Victor L. Villemagne;Shozo Furumoto;Michelle T. Fodero-Tavoletti;Rachel S. Mulligan

  • Tau PET imaging in Alzheimer's disease.

    Nobuyuki Okamura;Ryuichi Harada;Shozo Furumoto;Hiroyuki Arai

  • Histamine H1 receptors in patients with Alzheimer’s disease assessed by positron emission tomography

    M Higuchi;K Yanai;N Okamura;K Meguro

  • Selective cognitive dysfunction in mice lacking histamine H1 and H2 receptors.

    Hongmei Dai;Kenya Kaneko;Hiroshi Kato;Satoshi Fujii

  • CSF Phosphorylated Tau Protein and Mild Cognitive Impairment: A Prospective Study

    Hiroyuki Arai;Koichi Ishiguro;Hideto Ohno;Michiko Moriyama

  • Correlations of 18F-THK5351 PET with Postmortem Burden of Tau and Astrogliosis in Alzheimer Disease.

    Ryuichi Harada;Aiko Ishiki;Hideaki Kai;Naomi Sato

  • Functional neuroimaging of cognition impaired by a classical antihistamine, d‐chlorpheniramine

    Nobuyuki Okamura;Kazuhiko Yanai;Makoto Higuchi;Jun Sakai

  • [18F]THK-5117 PET for assessing neurofibrillary pathology in Alzheimer’s disease

    Ryuichi Harada;Nobuyuki Okamura;Shozo Furumoto;Katsutoshi Furukawa

  • Combined Analysis of CSF Tau Levels and [123I]Iodoamphetamine SPECT in Mild Cognitive Impairment: Implications for a Novel Predictor of Alzheimer’s Disease

    Nobuyuki Okamura;Hiroyuki Arai;Masahiro Maruyama;Makoto Higuchi

Frequent Co-Authors

Kazuhiko Yanai
Kazuhiko Yanai Tohoku University
Hiroyuki Arai
Hiroyuki Arai University of Tokyo
Manabu Tashiro
Manabu Tashiro Tohoku University
Victor L. Villemagne
Victor L. Villemagne University of Pittsburgh
Makoto Higuchi
Makoto Higuchi National Institutes for Quantum and Radiological Science and Technology
Christopher C. Rowe
Christopher C. Rowe University of Melbourne
Masatoshi Itoh
Masatoshi Itoh Tohoku University
Agneta Nordberg
Agneta Nordberg Karolinska University Hospital
Matthias Brendel
Matthias Brendel Ludwig-Maximilians-Universität München
Colin L. Masters
Colin L. Masters University of Melbourne

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