FAST SPIN-ECHO INVERSION-RECOVERY IMAGING VERSUS FAST T2-WEIGHTED SPIN-ECHO IMAGING IN BONE-MARROW ABNORMALITIES

RATIONALE AND OBJECTIVES. The purpose of this investigation is to comp are a fat-suppressed T2-weighted fast spin-echo (FSE) sequence in bone marrow abnormalities with an FSE STIR sequence that recently has beco me commercially available. METHODS. Fast spin-echo images (repetition time [TR], 3500-5000 mseconds; echo time [TE], 96-114 mseconds) and FS E STIR images (TR 3000-5000 mseconds; TE, 32-40 mseconds; inversion ti me [TI], 140-150 mseconds) were compared quantitatively and qualitativ ely calculating signal-to-noise ratios (SNRs), contrast-to-noise ratio s (CNRs), and lesion conspicuity and using a qualitative scoring syste m. RESULTS. Signal-to-noise ratio (mean +/- standard deviation) was 36 .4 +/- 19.3 for the FSE and 29.0 +/- 15.9 for the FSE STIR images (P = .002), Contrast-to-noise ratio (mean +/- standard deviation) was 18.7 +/- 14.3 for the FSE and 20.3 +/- 16.0 for the FSE STIR images (P = . 45). Lesion conspicuity (mean +/- standard deviation) was 1.7 +/- 1.5 for the FSE and 3.5 +/- 4.0 for the FSE STIR images (P = .025). The mo st important difference in the qualitative evaluation related to the b etter signal homogeneity on the FSE STIR images. CONCLUSIONS. Fast spi n-echo STIR images may be preferable to FSE images with fat suppressio n due to better image homogeneity and lesion conspicuity.