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Adrenal tissue characterization with 0.5-T MR imaging: Value of T2*-weighted images

✍ Scribed by Tomoaki Ichikawa; Hajime Fujimoto; Koji Murakami; Mikio Tauchi; Shigeru Mochizuki; Kuni Ohtomo; Guio Uchiyama

Publisher
John Wiley and Sons
Year
1993
Tongue
English
Weight
420 KB
Volume
3
Category
Article
ISSN
1053-1807

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✦ Synopsis

Abstract

The authors investigated the value of magnetic resonance (MR) imaging at 0.5 T for distinguishing adrenal adenomas from adrenal metastases. The series included 23 adrenal adenomas (18 nonhyperfunctioning, five hyperfunctioning) and 23 adrenal metastases from various organs. Adrenal tumor–liver signal intensity ratios on T1‐, T2‐, and T2*‐weighted images were calculated for adrenal tissue characterization. Adrenal adenomas were more precisely distinguished from adrenal metastases on T2*‐weighted images (21 of 23, 91%) than on T2‐weighted images (15 of 23, 65%). T1‐weighted images were not useful for this distinction. In conclusion, T2*‐weighted images were better than routine T2‐weighted images for distinguishing adrenal adenomas from adrenal metastases. It can be postulated that the total signal intensity of adrenal adenomas, which contain some fat components, decreased on T2*‐weighted images because of an out‐of‐phase effect.

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