Abstract:
:Recently, a technique based on arterial spin labeling, called dynamic arterial spin labeling (DASL (Magn Reson Med 1999;41:299-308)), has been introduced to measure simultaneously the transit time of the labeled blood from the labeling plane to the exchange site, the longitudinal relaxation time of the tissue, and the perfusion of the tissue. This technique relies on the measurement of the tissue magnetization response to a time varying labeling function. The analysis of the characteristics of the tissue magnetization response (transit time, filling time constant, and perfusion) allows for quantification of the tissue perfusion and for transit time map computations. In the present work, the DASL scheme is used in conjunction with echo planar imaging at 4.7 T to produce brain maps of perfusion and transit time in the anesthetized rat, under graded hypercapnia. The data obtained show the variation of perfusion and transit time as a function of arterial pCO2. Based on the data, CO2 reactivity maps are computed. Published 2001 Wiley-Liss, Inc.
journal_name
Magn Reson Medjournal_title
Magnetic resonance in medicineauthors
Barbier EL,Silva AC,Kim SG,Koretsky APdoi
10.1002/mrm.1136subject
Has Abstractpub_date
2001-06-01 00:00:00pages
1021-9issue
6eissn
0740-3194issn
1522-2594pii
10.1002/mrm.1136journal_volume
45pub_type
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