Premium
Simultaneous measurement of cerebral blood flow and transit time with turbo dynamic arterial spin labeling (Turbo‐DASL): Application to functional studies
Author(s) -
Meng Yuguang,
Wang Ping,
Kim SeongGi
Publication year - 2012
Publication title -
magnetic resonance in medicine
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.696
H-Index - 225
eISSN - 1522-2594
pISSN - 0740-3194
DOI - 10.1002/mrm.23294
Subject(s) - arterial spin labeling , cerebral blood flow , transit time , isoflurane , chemistry , blood flow , arterial blood , chloralose , hemodynamics , anesthesia , stimulation , medicine , transport engineering , engineering
Abstract A turbo dynamic arterial spin labeling method (Turbo‐DASL) was developed to simultaneously measure cerebral blood flow (CBF) and blood transit time with high temporal resolution. With Turbo‐DASL, images were repeatedly acquired with a spiral readout after small‐angle excitations during pseudocontinuous arterial spin labeling and control periods. Turbo‐DASL experiments at 9.4 T without and with diffusion gradients were performed on rats anesthetized with isoflurane or α‐chloralose. We determined blood transit times from carotid arteries to cortical arterial vessels (TT a ) from data obtained without diffusion gradients and to capillaries (TT c ) from data obtained with diffusion gradients. Cerebral arterial blood volume (CBV a ) was also calculated. At the baseline condition, both CBF and CBV a in the somatosensory cortical area were 40–50% less in rats with α‐chloralose than in rats with isoflurane, while TT a and TT c were similar for both anesthetics. Absolute CBF and CBV a were positively correlated, while CBF and TT c were slightly negatively correlated. During forepaw stimulation, CBF increase was 15 ± 3% ( n = 7) vs. 60 ± 7% ( n = 5), and CBV a increase was 19 ± 9% vs. 46 ± 17% under isoflurane vs. α‐chloralose anesthesia, respectively; CBF vs. CBV a changes were highly correlated. However, TT a and TT c were not significantly changed during stimulation. Our results support that arterial CBV increase plays a major role in functional CBF changes. Magn Reson Med, 2012. © 2011 Wiley Periodicals, Inc.