肝脏局灶性小占位的磁共振信号强度比与病灶性质的相关性

目的 计算肝细胞癌、肝转移瘤、肝脏海绵状血管瘤和肝囊肿的病灶／肝脏磁共振信号强度比（SIR），并评价其与病灶性质的关系。方法 随机选择经确诊的肝细胞癌、肝转移瘤、肝海绵状血管瘤和肝囊肿病例共92例（148个病灶）行前瞻性磁共振成像（0．5T）研究。计算4种病灶的SIR，并进行统计学分析。结果 在T1W图像上，肝海绵状血管瘤与恶性肿瘤的SIR值间差异无显著性（t=1.799，P=0.075)；质子加权像上，良恶性肿瘤的SIR之间无统计学意义（t=0.691,P=0.491)；T2WI上，良性病变的SIR显著高于恶性肿瘤（P＜0．01），且4种病变的SIR值与回波时间（TE）之间均存在线性正向相关关系。结论 在T2WI个测得的SIR可用于区分肝脏占位性病灶的性质。

Correlative Study Between Identifications and Signal Intensity Ratio (SIR) of the Small Focal Hepatic Lesions

Objective To determine the value of lesion/liver signal intensity ratio (SIR) in characterizing the small focal hepatic lesions.Method Ninety two patients with 148 focal hepatic lesions were prospectively performed magnetic resonance imaging at 0.5T.Calculated lesion/liver signal intensity ratios (SIR) of hepatocellular carcinomas,metastases,hemangiomas and cysts.Result There was no significant difference between the values of SIR for hemangiomas and those for malignant lesions at T 1 weighted imaging(t=1.799,P=0.075),and there was no significant difference between the benign lesions and malignant lesions at proton density imaging(t=0.691,P=0.491).The values of the signal intensity ratios at T 2 weighted imaging for benign lesions were significantly higher than those for malignant lesions(P<0.01),linear positive correlation was found between the SIR values of the four typies liver lesions and echo time (TE).Conclusion In T 2 weighted imaging,the values of SIR can be used to characterize hepatic lesions.