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Gastrointestinal Imaging |
1 From the Department of Radiology, Center for Advanced Imaging/West, CC090, Beth Israel Deaconess Medical Center, 1 Deaconess Rd, Boston, MA 02215. Received October 16, 2002; revision requested December 23; final revision received May 22, 2003; accepted July 1. Supported in part by the French Society of Radiology (SFR), the French Association for Research in Oncology (ARC), and the National Institute of Biomedical Imaging and Bioengineering grant R21EB00562. Address correspondence to C.M.J.d.B. (e-mail: cdebazel@caregroup.harvard.edu).
PURPOSE: To measure T1 and T2 relaxation times of normal human abdominal and pelvic tissues and lumbar vertebral bone marrow at 3.0 T.
MATERIALS AND METHODS: Relaxation time was measured in six healthy volunteers with an inversion-recovery method and different inversion times and a multiple spin-echo (SE) technique with different echo times to measure T1 and T2, respectively. Six images were acquired during one breath hold with a half-Fourier acquisition single-shot fast SE sequence. Signal intensities in regions of interest were fit to theoretical curves. Measurements were performed at 1.5 and 3.0 T. Relaxation times at 1.5 T were compared with those reported in the literature by using a one-sample t test. Differences in mean relaxation time between 1.5 and 3.0 T were analyzed with a two-sample paired t test.
RESULTS: Relaxation times (mean ± SD) at 3.0 T are reported for kidney cortex (T1, 1,142 msec ± 154; T2, 76 msec ± 7), kidney medulla (T1, 1,545 msec ± 142; T2, 81 msec ± 8), liver (T1, 809 msec ± 71; T2, 34 msec ± 4), spleen (T1, 1,328 msec ± 31; T2, 61 msec ± 9), pancreas (T1, 725 msec ± 71; T2, 43 msec ± 7), paravertebral muscle (T1, 898 msec ± 33; T2, 29 msec ± 4), bone marrow in L4 vertebra (T1, 586 msec ± 73; T2, 49 msec ± 4), subcutaneous fat (T1, 382 msec ± 13; T2, 68 msec ± 4), prostate (T1, 1,597 msec ± 42; T2, 74 msec ± 9), myometrium (T1, 1,514 msec ± 156; T2, 79 msec ± 10), endometrium (T1, 1,453 msec ± 123; T2, 59 msec ± 1), and cervix (T1, 1,616 msec ± 61; T2, 83 msec ± 7). On average, T1 relaxation times were 21% longer (P < .05) for kidney cortex, liver, and spleen and T2 relaxation times were 8% shorter (P < .05) for liver, spleen, and fat at 3.0 T; however, the fractional change in T1 and T2 relaxation times varied greatly with the organ. At 1.5 T, no significant differences (P > .05) in T1 relaxation time between the results of this study and the results of other studies for liver, kidney, spleen, and muscle tissue were found.
CONCLUSION: T1 relaxation times are generally higher and T2 relaxation times are generally lower at 3.0 T than at 1.5 T, but the magnitude of change varies greatly in different tissues.
© RSNA, 2004
Index terms: Abdomen, MR, 761.12146, 770.12146, 775.12146 • Magnetic resonance (MR), tissue characterization • Pelvis, MR, 844.12146, 854.12146
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