4.5 Article

Brain MR Perfusion-Weighted Imaging With Alternate Ascending/Descending Directional Navigation

Journal

MAGNETIC RESONANCE IN MEDICINE
Volume 65, Issue 6, Pages 1578-1591

Publisher

WILEY-BLACKWELL
DOI: 10.1002/mrm.22580

Keywords

arterial spin labeling; perfusion-weighted imaging; perfusion directionality; white matter perfusion; balanced steady state free precession; alternate ascending/descending directional navigation

Funding

  1. NEI NIH HHS [R01 EY014211, R01 EY018855] Funding Source: Medline
  2. NINDS NIH HHS [R01 NS045879] Funding Source: Medline

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In this study, a new arterial spin labeling technique that requires no separate spin preparation pulse was developed. Sequential two-dimensional slices were acquired in ascending and descending orders by turns using balanced steady state free precession for pair-wise subtraction. Simulation studies showed this new technique, alternate ascending/descending directional navigation (ALADDIN), has high sensitivity to both slow- (1-10 cm/sec) and fast-moving (>10 cm/sec) blood because of the presence of multiple labeling planes proximal to imaging planes and sensitivity of balanced steady state free precession to initial magnetization differences. ALADDIN provided high-resolution multislice perfusion-weighted images in similar to 3 min. About 80-90% of signals in a slice were ascribed to spins saturated in the four prior slices. Three to five edge slices on each side of imaging group were affected by transient magnetization transfer effects and incomplete T(1) recovery between successive acquisitions. ALADDIN signals were dependent on many imaging parameters, implying room for improvement. Sagittal and coronal ALADDIN images demonstrated perfusion direction in gray matter regions was mostly from center to lateral, anterior, or posterior, whereas that in some white matter regions was reversed. ALADDIN is likely useful for many studies requiring perfusion-weighted imaging with short scan time, insensitiveness to arterial transit time, directional information, high resolution, and/or wide coverage. Magn Reson Med 65:1578-1591, 2011. (C)2010 Wiley-Liss, Inc.

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