T2-Weighted Fast MR Imaging with True FISP Versus HASTE

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Abstract
OBJECTIVE. This study compares the relative efficacy of two fast T2-weighted MR imaging techniques—fast imaging with steady-state free precession (true FISP) and half-Fourier acquisition single-shot turbo spin-echo (HASTE)—in the evaluation of the normal fetal brain maturation during the second and third trimesters of gestation.SUBJECTS AND METHODS. The brain maturation of 10 normal nonsedated fetuses (5 during the second trimester and 6 during the third trimester of gestation [1 fetus underwent 2 examinations]) was examined by both techniques using a Vision+ 1.5-T MR system. We specifically looked for developing events, including white matter myelination, neuronal migration, and cortical sulcation. Image quality was graded according to the presence or absence of undesirable blurring.RESULTS. The specific absorption rate was lower for true FISP than for HASTE by a factor of 3 at equivalent imaging conditions. HASTE and true FISP provide comparable image quality in the second trimester when myelination of ...