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Focal Hepatic Lesion Detection: Comparison of Four Fat-suppressed T2-weighted MR Imaging Pulse Sequences¹

¹ From the Department of Radiology, Gifu University School of Medicine, 40 Tsukasamachi, Gifu 500-8705, Japan (M.K., H.H., H.K., R.Y.); the Department of Radiology, Kyoto University Faculty of Medicine, Japan (K.I.); and the Department of Radiology, Osaka University Medical School, Japan (T.M., M.H., H.N.). Received March 10, 1998; revision requested May 7; final revision received August 6; accepted October 26. Address reprint requests to M.K.

PURPOSE: To evaluate fat-suppressed T2-weighted magnetic resonance (MR) imaging with conventional spin-echo (SE), breath-hold fast SE, respiratory-triggered fast SE, and breath-hold multishot SE echo-planar sequences for the detection of focal hepatic lesions.

MATERIALS AND METHODS: Fat-suppressed T2-weighted MR images obtained with the four sequences in 55 patients with 81 solid and 129 nonsolid lesions were retrospectively analyzed. Image review was conducted on a segment-by-segment basis; a total of 440 liver segments were reviewed separately for solid and nonsolid lesions by three independent radiologists. Diagnostic accuracy was evaluated with receiver operating characteristic analysis.

RESULTS: The mean lesion-to-liver contrast-to-noise ratio was highest on the multishot SE echo-planar images of both solid and nonsolid lesions. Fat-suppressed respiratory-triggered fast SE images had significantly better (P < .05) or comparative detectability of both solid and nonsolid lesions compared with the other types of images. Image quality was best on the respiratory-triggered fast SE images.

CONCLUSION: Fat-suppressed respiratory-triggered fast SE imaging should replace fat-suppressed conventional SE imaging as a standard T2-weighted imaging examination in the detection of focal hepatic lesions.

Index terms: Angioma, gastrointestinal tract, 761.3194 • Liver neoplasms, 761.312, 761.3194, 761.323, 761.332 • Liver neoplasms, MR, 761.121411, 761.121414, 761.121415, 761.121416 • Magnetic resonance (MR), comparative studies, 761.121411, 761.121414, 761.121415, 761.121416 • Magnetic resonance (MR), pulse sequences, 761.121411, 761.121416

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