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Noninvasive measurement of arterial cerebral blood volume using look-locker EPI and arterial spin labeling by M.J. Brookes; P.G. Morris; P.A. Gowland; S.T. Francis is a Medicine article available to read on EtoBox.

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## Abstract This paper describes a method of noninvasively measuring regional arterial cerebral blood volume fractions (CBV~a~) __in vivo__ using the combination of Look‐Locker echo‐planar imaging (LL‐EPI) with arterial spin labeling (ASL). Using this technique the arterial inflow curve is rapidly sampled and the regional CBV~a~ is measured, while tissue perfusion signals are suppressed. Two methods of spin labeling (LL‐EPI flow‐sensitive alternating inversion recovery (LL‐EPI‐FAIR) and LL‐EPI signal targeting using alternating radiofrequency (LL‐EPI‐STAR)) are assessed and their advantages discussed. The application of vascular crushing to LL‐EPI‐FAIR is described and used to validate the insensitivity of the sequence to the perfusion difference signal. LL‐EPI‐STAR is used to assess changes in CBV~a~ in response to a finger‐tapping task. LL‐EPI‐STAR signal difference curves are shown to have a shortened vascular transit delay and increased peak signal change on activation. A 33 ± 14% increase in CBV~a~ on activation is found. CBV~a~ is measured with a 6‐s temporal resolution and the temporal response is compared with the BOLD signal change. CBV~a~ is shown to increase more rapidly

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Author

M.J. Brookes; P.G. Morris; P.A. Gowland; S.T. Francis

Publisher

John Wiley and Sons; Wiley (John Wiley & Sons); John Wiley & Sons Inc.; Wiley (ISSN 0740-3194)

Published

2007

Language

EN

Field

Medicine (Health Sciences)