Reduced slat, boundary artifact in multi-slab 3D fast spin-echo imaging

Liu, KC Xu, YS Loncar, M

Kc. Liu et al., Reduced slat, boundary artifact in multi-slab 3D fast spin-echo imaging, MAGN RES M, 44(2), 2000, pp. 269-276

26

INGLESE

Article

Radiology ,Nuclear Medicine & Imaging","Medical Research Diagnosis & Treatment

MAGNETIC RESONANCE IN MEDICINE

0740-3194 → ACNP

44

2

2000

269 - 276

ISI

0740-3194(200008)44:2<269:RSBAIM>2.0.ZU;2-N

The three-dimensional multi-slab fast spin-echo (3DFSE) sequence is a time- efficient technique for volume scanning which provides images with a good s ignal-to-noise ratio, adjustable contrast weighting, and high spatial resol ution, Unfortunately, it suffers from slice-to-slice amplitude variation as sociated with imperfect slab definition. This slab boundary artifact become s especially apparent when multiplanner reformatting is used to create alte rnate anatomical views. The shifted interleaved multi-volume acquisition (S IMVA) described here suppresses slab boundary artifact in image space. It d isplaces each slab (RF excitation) position incrementally along the slice ( z) axis, in coordination with the primary phase encode step, so that the sl ab boundary artifact is converted into a correctable amplitude modulation i n the primary phase encode direction (k(y)-axis). After the Fourier transfo rm in primary phase encoding, the slab boundary artifact is mapped into a d ifferent and less severe artifact on a different spatial axis. Preliminary measurements show that SIMVA reduces the slab boundary artifact by an order of magnitude in multiplanar reformatted views. Magn Reson Med 44:269-276, 2000. (C) 2000 Wiley-Liss, Inc.