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Gastrointestinal Imaging |
1 From the Department of Radiology, Hôpital Beaujon and Laboratoire dImagerie Médicale Paris-Nord, Faculté de Médecine Paris VII, Clichy, France (B.T., V.V., E.D., J.L.D., Y.M.); and Department of Radiology, University of California San Francisco, 505 Parnassus Ave, Rm M-372, Box 0628, San Francisco, CA 94143 (B.T., B.F.). From the 2001 RSNA scientific assembly. Received November 27, 2001; revision requested February 7, 2002; revision received March 15; accepted May 7. Supported by a grant from the French Radiology Society. Address correspondence to B.T. (e-mail: bachir.taouli@radiology.ucsf.edu).
PURPOSE: To (a) evaluate liver diffusion isotropy, (b) compare two diffusion-weighted magnetic resonance (MR) imaging sequences for the characterization of focal hepatic lesions by using two or four b values, and (c) determine an apparent diffusion coefficient (ADC) threshold value to differentiate benign from malignant lesions.
MATERIALS AND METHODS: Sixty-six patients were examined with two single-shot echo-planar diffusion-weighted MR sequences. In the first sequence, liver diffusion isotropy was evaluated by using diffusion gradients in three directions with two b values. In the second sequence, a unidirectional diffusion gradient was used with four b values. ADCs were measured in 43 patients with 52 focal hepatic lesions more than 1 cm in diameter and in 23 patients with 14 normal and nine cirrhotic livers and were compared by using nonparametric tests.
RESULTS: Diffusion in the liver parenchyma was isotropic. ADCs of focal hepatic lesions were significantly different between sequences (P < .01). The mean (± SD) ADCs in the first sequence were 0.94 x 10-3 mm2/sec ± 0.60 for metastases, 1.33 x 10-3 mm2/sec ± 0.13 for HCCs, 1.75 x 10-3 mm2/sec ± 0.46 for benign hepatocellular lesions, 2.95 x 10-3 mm2/sec ± 0.67 for hemangiomas, and 3.63 x 10-3 mm2/sec ± 0.56 for cysts. There was a significant difference between benign (2.45 x 10-3 mm2/sec ± 0.96, isotropic value) and malignant (1.08 x 10-3 mm2/sec ± 0.50) lesions (P < .01 for both sequences).
CONCLUSION: Diffusion-weighted MR imaging can help differentiate benign from malignant hepatic lesions. The use of two b values in one direction could be sufficient for the design of MR sequences in the liver.
© RSNA, 2002
Index terms: Liver, diseases, 761.30, 761.79 Liver, focal nodular hyperplasia, 761.3198 Liver neoplasms, 761.30 Liver neoplasms, MR, 761.121416, 761.12144 Magnetic resonance (MR), diffusion study, 761.12144 Magnetic resonance (MR), echo planar, 761.121416
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