关键词: 核磁共振成像, 早期强化倍数, 延迟强化模式

Abstract: Objective To study the diagnostic value of MR mammography （MRM）　in judging the nature of breast disease. Methods 145 cases with breast disease were retrospectively studied to investigate the relationships between two parameters (early-phase enhancement rate and the type of the delayed enhancement) and different breast diseases. All patients underwent MRM examination before surgical operation. Results ①Strengthen multiple in early stage larger than 3 times was inclined to malignant lesion; Strengthen multiple smaller than 1 time was inclined to benign lesion. ②Drop type of delayed enhancement was the important parameter in diagnosis of ductal carcinoma. If drop type of delayed enhancement was viewed as the diagnosis standard of the ductal carcinoma of breast onl y:81% cases with invasive type of the ductal carcinoma, 65% cases with noninvasive type of the ductal carcinoma had been diagnosed correctly; 14% cases with benign breast lesions had been diagnosed exaggeratedly. ③If strengthen multiple in early stage larger than 2.5 times in rising type of delayed enhancement and drop type of delayed enhancement was viewed as the diagnosis standard of the ductal carcinoma of breast,87.9% cases with invasive ductal carcinoma, 73.1% cases with noninvasive ductal carcinoma had been diagnosed correctly; 21.4% cases within benign breast lesions had been diagnosed exaggeratedly. Conclusion Compared with differential of disease nature by the type of the delayed enhancement only, the correct rate of diagnosis of breast ductal carcinoma mentioned above is raised if two parameters are combined. But the correct diagnosis rate of benign lesions is decreased.

Key words: magnetic resonance imaging, strengthen multiple in early stage, type of delayed enhancement