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Head and Neck Imaging |
1 From the Departments of Radiology (J.W., S.T., F.T., S.K., A.S., T.M., M.M.) and Otolaryngology (T.I.), Shinshu University School of Medicine, 3-1-1 Asahi, Matsumoto, Nagano 390-8621, Japan. From the 2000 RSNA scientific assembly. Received November 29, 2000; revision requested January 4, 2001; revision received February 28; accepted March 29. Address correspondence to S.T. (e-mail: shodayu@hsp.md.shinshu-u.ac.jp).
PURPOSE: To evaluate whether apparent diffusion coefficients (ADCs) calculated from diffusion-weighted echo-planar magnetic resonance (MR) images can be used to characterize head and neck lesions.
MATERIALS AND METHODS: Diffusion-weighted echo-planar MR imaging was performed with a 1.5-T MR unit in 97 head and neck lesions in 97 patients. Images were obtained with a diffusion-weighted factor, factor b, of 0, 500, and 1,000 sec/mm2, and an ADC map was constructed. The ADCs of lesions, cerebrospinal fluid, and spinal cord were calculated.
RESULTS: Acceptable images for ADC measurement were obtained in 81 (84%) patients. The mean ADC of malignant lymphomas, (0.66 ± 0.17[SD]) x 10-3 mm2/sec (n = 13), was significantly smaller (P < .001) than that of carcinomas. The mean ADC of carcinomas, (1.13 ± 0.43) x 10-3 mm2/sec (n = 36), was significantly smaller (P = .002) than that of benign solid tumors. The mean ADC of benign solid tumors, (1.56 ± 0.51) x 10-3 mm2/sec (n = 22), was significantly smaller (P = .035) than that of benign cystic lesions, (2.05 ± 0.62) x 10-3 mm2/sec (n = 10). No significant differences were seen in the mean ADC of cerebrospinal fluid and of spinal cord among four groups of lesions. When an ADC smaller than 1.22 x 10-3 mm2/sec was used for predicting malignancy, the highest accuracy of 86%, with 84% sensitivity and 91% specificity, was obtained.
CONCLUSION: Measurement of ADCs may be used to characterize head and neck lesions.
Index terms: Head and neck neoplasms, 20.343, 20.361, 20.362, 20.373, 20.379 • Head and neck neoplasms, MR, 20.1214 • Magnetic resonance (MR), diffusion study, 20.12144 • Magnetic resonance (MR), echo planar, 20.121416
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