hypoperfusion_index_ratio [Neurosurgery Wiki]

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HIR can be easily assessed on automatically processed perfusion maps and predicts the rate of collateral flow, infarct growth, and clinical outcome
((Olivot JM, Mlynash M, Inoue M, Marks MP, Wheeler HM, Kemp S, Straka M,
Zaharchuk G, Bammer R, Lansberg MG, Albers GW; DEFUSE 2 Investigators.
Hypoperfusion intensity ratio predicts infarct progression and functional outcome
in the DEFUSE 2 Cohort. Stroke. 2014 Apr;45(4):1018-23. doi:
10.1161/STROKEAHA.113.003857. Epub 2014 Mar 4. Erratum in: Stroke. 2014
May;45(5):e92. PubMed PMID: 24595591; PubMed Central PMCID: PMC4047639.
)).

Relative [[cerebral blood volume]] (rCBV) and  [[hypoperfusion index ratio]] (HIR) may serve as markers of collateral circulation in [[acute ischemic stroke]] (AIS) patients prior to endovascular therapy
((Arenillas JF, Cortijo E, García-Bermejo P, Levy EI, Jahan R, Goyal M, Saver
JL, Albers GW. Relative cerebral blood volume is associated with collateral
status and infarct growth in stroke patients in SWIFT PRIME. J Cereb Blood Flow
Metab. 2017 Jan 1:271678X17740293. doi: 10.1177/0271678X17740293. [Epub ahead of 
print] PubMed PMID: 29135347.
)).