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Hospital / health system · Sendai · Japan

Kohnan Hospital

In research, Kohnan Hospital stands highest in Medicine (#12,719 of 17,978 worldwide), Health Sciences (#15,498 of 20,462 worldwide) and Neurology (#917 of 986 worldwide), over all time.

kohnan-sendai.or.jpROR OpenAlex
World rank, all time
#31,270
of 42,892
Rank in Japan
#1,290
of 2,112
Research works
606
▼ 8% vs 2013–17
Citations
8.6k
14.1 per fractional work
Top-10% rate
9.2%
record average 16.5%
Open access
36%
world 28%

What is Kohnan Hospital known for in research?

The fields where it stands highest, over all time, ranked among every institution above the floor in each field.

FieldWorld rankWhere that sitsTop-10% rateWorks
MedicineField #12,719 of 17,978 7.0%467
Health SciencesDomain #15,498 of 20,462 7.1%479
NeurologySubfield #917 of 986 7.0%140

Each strip is that field’s whole ranked pool, with the notch where Kohnan Hospital sits in it, in the colour of the band that rank falls in. The track under the rate is the rate itself: it carries no world mark, because the world rate differs by field (from about 6% to 21% in this record).

Field profile

Location quotient across every field it publishes in: outside the ring is more than an institution of this size would be expected to publish, inside it is less.

Agricultural and Biological Sciences: 0.44× its world share, 1 worksAgricultural and Bio…Biochemistry, Genetics and Molecular Biology: 0.49× its world share, 1 worksBiochemistry, Geneti…Immunology and Microbiology: 0.35× its world share, 0 worksImmunology and Micro…Neuroscience: 2.22× its world share, 2 worksNeuroscienceComputer Science: 0.09× its world share, 0 worksComputer ScienceEngineering: 0.15× its world share, 1 worksEngineeringEnvironmental Science: 0.07× its world share, 0 worksEnvironmental ScienceMaterials Science: 0.10× its world share, 0 worksMaterials ScienceHealth Professions: 1.82× its world share, 2 worksHealth ProfessionsMedicine: 3.84× its world share, 35 worksMedicineNursing: 0.48× its world share, 0 worksNursingArts and Humanities: 0.24× its world share, 0 worksArts and HumanitiesBusiness, Management and Accounting: 0.11× its world share, 0 worksBusiness, Management…Psychology: 0.54× its world share, 1 worksPsychologySocial Sciences: 0.47× its world share, 3 worksSocial Sciences1×world share
more than its size predictsabout as predictedless

Rings at 0.5×, 1× and 2×. Widest outward: Medicine, 3.8×. Every wedge is a field page.

Who are the top researchers at Kohnan Hospital?

Ranked on the composite score, Yasushi Matsumoto, Yukako Yazawa and Ryo Itabashi lead among researchers whose main affiliation is Kohnan Hospital.

  1. 1 Yasushi Matsumoto Japan · #74,067 worldwide 171 citations · 53 works
  2. 2 Yukako Yazawa Japan · #293,715 worldwide 145 citations · 16 works
  3. 3 Ryo Itabashi Japan · #308,897 worldwide 45 citations · 25 works
  4. 4 Takuya Saito Japan · #325,343 worldwide 121 citations · 16 works
  5. 5 Eisuke Furui Japan · #488,173 worldwide 70 citations · 22 works
  6. 6 Yoshihide Nagamine Japan · #997,799 worldwide 15 citations · 15 works
  7. 7 Kaoru Endô Japan · #1,150,671 worldwide 19 citations · 17 works
  8. 8 Yoshikazu Ogawa Japan · #1,196,067 worldwide 11 citations · 24 works
All ranked researchers at Kohnan Hospital

Which keywords describe research at Kohnan Hospital?

By fractional works in 2022–2025, weighted toward what it does more of than the world: Endovascular Treatment, Aneurysmal Subarachnoid Hemorrhage, Intracranial Aneurysms, Neuroprotection, Epidemiology, Magnetic Resonance Imaging, Stroke Prevention and Carotid Artery Stenosis.

▲ more of its work than of the world’s◆ about the world’s share▼ less than the world’s

Size is fractional works in 2022–2025 in the topics tagged with each word; colour is the word's share of this institution's work against its share of the world's. The 40 words are chosen for being large and distinctive. Each links to the topic it comes from most.

All 40 words, with their numbers
  1. Endovascular Treatment6▲ 226×2 topics
  2. Epidemiology6▲ 3.2×22 topics
  3. Aneurysmal Subarachnoid Hemorrhage4▲ 252×1 topic
  4. Intracranial Aneurysms4▲ 252×1 topic
  5. Neuroprotection4▲ 24×3 topics
  6. Magnetic Resonance Imaging3▲ 28×3 topics
  7. Risk Factors3▲ 6.2×5 topics
  8. Stroke Prevention3▲ 57×2 topics
  9. Carotid Artery Stenosis3▲ 136×1 topic
  10. Endarterectomy3▲ 136×1 topic
  11. Global Burden3▲ 12×4 topics
  12. Ischemic Stroke3▲ 39×2 topics
  13. Radiosurgery3▲ 65×3 topics
  14. Endovascular Therapy3▲ 86×1 topic
  15. Thrombolysis3▲ 86×1 topic
  16. Genetic Mutations3▲ 13×7 topics
  17. Management2▲ 6.4×7 topics
  18. Clinical Management2▲ 28×4 topics
  19. Embolization2▲ 75×3 topics
  20. Neuroinflammation2▲ 17×3 topics
  21. Intracranial Pressure2▲ 59×2 topics
  22. Arteriovenous Malformations2▲ 186×1 topic
  23. Cerebral Cavernous Malformations2▲ 186×1 topic
  24. Treatment2▲ 3.3×12 topics
  25. Diagnosis2▲ 4.0×10 topics
  26. Neurological Disorders2▲ 5.7×5 topics
  27. Pathophysiology2▲ 11×4 topics
  28. Prognosis2▲ 9.8×5 topics
  29. Genetic Susceptibility1▲ 31×3 topics
  30. Surgical Management1▲ 7.3×7 topics
  31. Neurological Complications1▲ 45×3 topics
  32. Traumatic Brain Injury1▲ 31×2 topics
  33. Anticoagulant Therapy1▲ 20×4 topics
  34. Cerebral Blood Flow1▲ 36×1 topic
  35. Microdialysis1▲ 53×1 topic
  36. Elderly1▲ 9.7×4 topics
  37. Hydrocephalus1▲ 54×2 topics
  38. Moyamoya Disease1▲ 231×1 topic
  39. RNF213 Gene1▲ 231×1 topic
  40. Nursing1▲ 11×2 topics

Which research topics does Kohnan Hospital publish most on?

By volume in 2022–2025: Intracranial Aneurysms: Treatment and Complications, Cerebrovascular and Carotid Artery Diseases, Acute Ischemic Stroke Management and Vascular Malformations Diagnosis and Treatment.

Intracranial Aneurysms: …4Intracranial Aneurysms: Treatment and Complications: 4 fractional worksCerebrovascular and Carotid Artery Diseases: 3 fractional worksAcute Ischemic Stroke Management: 3 fractional worksVascular Malformations Diagnosis and Treatment: 2 fractional worksTraumatic Brain Injury and Neurovascular Disturbances: 1 fractional worksMoyamoya disease diagnos…1Moyamoya disease diagnosis and treatment: 1 fractional worksIntracerebral and Subarachnoid Hemorrhage Research: 1 fractional worksCerebrospinal fluid and hydrocephalus: 1 fractional worksStroke Rehabilitation and Recovery: 1 fractional worksMeningioma and schwannoma management: 1 fractional works
NeurologyPulmonary and Respiratory MedicineEpidemiologyRheumatology2 others

Area is fractional works; colour is the subfield each topic belongs to.

  1. 1 Intracranial Aneurysms: Treatment and Complications Neurology 4 works
  2. 2 Cerebrovascular and Carotid Artery Diseases Pulmonary and Respiratory Medicine 3 works
  3. 3 Acute Ischemic Stroke Management Epidemiology 3 works
  4. 4 Vascular Malformations Diagnosis and Treatment Neurology 2 works
  5. 5 Traumatic Brain Injury and Neurovascular Disturbances Neurology 1 works
  6. 6 Moyamoya disease diagnosis and treatment Rheumatology 1 works
  7. 7 Intracerebral and Subarachnoid Hemorrhage Research Neurology 1 works
  8. 8 Cerebrospinal fluid and hydrocephalus Cellular and Molecular Neuroscience 1 works
  9. 9 Stroke Rehabilitation and Recovery Rehabilitation 1 works
  10. 10 Meningioma and schwannoma management Epidemiology 1 works

How open and international is its research?

Against the world’s own shares — the tick on each track. Both are shares of its output, so they sit on one scale and can be read against each other as well as against the world.

openly available35.5%not open64.5%

World: 28% of research is openly available.

with international co-authors7.5%domestic only92.5%

World: 19% is written across borders.

How has Kohnan Hospital's research output changed?

Output in 2018–2022 was 8% lower than in 2013–2017.

1990200020102020
grewheldshrank

The same series as a ribbon — one cell per year, darker for more. The line above answers how much; this answers when.

Other research institutions in Sendai

All research institutions in Sendai

Research measures only: rankings here say nothing about teaching, admissions or student experience. Comparable institutions and collaboration partners are in the interactive view on the map.