RT Journal Article
SR Electronic
T1 Optimization of Gray/White Matter Contrast with Fast Inversion Recovery for Myelin Suppression: A Comparison of Fast Spin-Echo and Echo-Planar MR Imaging Sequences
JF American Journal of Neuroradiology
JO Am. J. Neuroradiol.
FD American Society of Neuroradiology
SP 1653
OP 1657
VO 20
IS 9
A1 Leo J. Wolansky
A1 Steven G. Finden
A1 Janet Chen
A1 Rafik Hanna
A1 Andrei I. Holodny
A1 Imtiaz Ahmad
A1 Wen Ching Liu
A1 Sohail Contractor
YR 1999
UL http://www.ajnr.org/content/20/9/1653.abstract
AB Summary: We compared two MR imaging sequences, fast inversion recovery for myelin suppression (FIRMS) and echo-planar FIRMS (EP-FIRMS), for depicting gray/white matter contrast. In 18 patients, the frequency bandwidth (BW) was optimized for each sequence; in nine patients, the BW was held constant. In the BW-optimized group, the mean contrast-to-noise ratio (C/N) was three times higher with the FIRMS sequence. In the BW-constant group, the mean C/N was 27% higher with the EP-FIRMS sequence; however, geometric distortion degraded the EP-FIRMS images excessively. For optimal gray/white contrast, FIRMS appears to be the superior pulse sequence.