3.0 T ~1H-MRS定量评价脂肪肝的价值探讨

目的探讨3.0 T磁共振氢波谱成像(1H-MRS)在定量评价肝脏脂肪含量中的价值。方法前瞻性纳入22例可获得肝脏标本的患者(活体肝移植供体候选者、部分需作肝段/肝叶切除的肝病患者等)作为研究对象,采用点分辨选择性波谱序列(point resolved selective spectroscopy,PRESS)对研究对象的肝脏行1H-MRS检查,采用SAGE软件包测定水峰峰值(PW)、脂峰峰值(PL)、水峰峰下面积(AW)及脂峰峰下面积(AL),计算肝细胞相对脂肪含量1(relative lipid content one,RLC1)及肝细胞相对脂肪含量2(relative lipid content two,RLC2)。于MR扫描后当日至1周内通过手术获取肝脏标本,并对标本进行组织学检查,对肝脏脂肪含量进行分级,并将影像学数据与病理结果对照研究。结果22例患者中,7例无脂肪肝,11例轻度脂肪肝,4例中重度脂肪肝;不同病理级别间比较,PL、AL、RLC1及RLC2的差异均有统计学意义(P0.05),随着病理分级升高,对应的各指标的值也相应升高;PL、AL、RLC1及RLC2与脂变细胞百分含量(proportion of fatty degenerative cells,PFDC)之间存在线性正相关关系(P0.05),以RLC1的相关系数最高(0.771 3)。结论1H-MRS能够较精确地反应脂肪肝的严重程度,有望替代有创性的肝穿刺活检。

Value of ~1H-MR Spectroscopy for Quantification of Hepatic Steatosis on 3.0 T MR System

Objective To investigate the diagnostic value of proton magnetic resonance spectroscopy(1H-MRS) on the quantification of hepatic steatosis at 3.0 T MR united.Methods Twenty-two patients who were candidated for liver surgery(living liver transplantation donor candidates,lobectomy or segmental resection for focal liver diseases,etc.) were enrolled in this study.1H-MRS was conducted with point resolved selective spectroscopy(PRESS) sequence,using SAGE software packages.The values of water peak(PW),lipid peak(P...