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目的 评价梯度回波化学位移成像诊断腹腔含有脂质病变的价值。方法 把 35例腹腔病变分成含脂病变组和非含脂病变组。均行梯度回波同相 (in phase,IP)和反相 (opposed phase ,OP)扫描 ,观察这些病灶在IP和OP像上的显示情况 ;测定其信号强度 ,计算IP和OP像上信号强度变化率 ,并作非参数统计检验。结果 腹腔内含脂病灶在OP像上信号强度较IP像有明显下降 ,其信号强度变化率的中位数为 37.1% ,而非含脂病灶信号强度变化不大 ,中位数为 3.3 % ,两组差异有显著性意义 (u =4.5 6 ,P <0 .0 1)。结论 梯度回波化学位移成像简单实用 ,对检测腹部病变是否含有脂质有一定帮助。
Objective To evaluate the value of gradient echo chemical shift imaging in the diagnosis of abdominal lesions containing lipid. Methods 35 cases of celiac lesions were divided into fat-containing lesions and non-fat lesions. The images of IP and OP were observed in both in-phase (IP) and opposed-phase (OP) scans, and the signal intensity was measured to calculate the change of signal intensity on IP and OP images Rate, and test for non-parametric statistics. Results The signal intensity of intraperitoneal fat-containing lesions on OP images was significantly lower than that on IP images. The median change of signal intensity was 37.1%, while the change of signal intensity of non-fat-containing lesions was insignificant with a median of 3.3% There was significant difference between the two groups (u = 4.56, P <0.01). Conclusions Gradient echo chemical shift imaging is simple and practical, which is helpful to detect whether abdominal lesions contain lipid.