Okada Y, Ohtomo K, Kiryu S, Sasaki Y
Department of Radiology, University of Tokyo, Japan.
J Comput Assist Tomogr. 1998 May-Jun;22(3):364-71. doi: 10.1097/00004728-199805000-00005.
The purpose of our study was to evaluate the efficacy of echo planar imaging (EPI) as a breath-holding T2-weighted technique for imaging focal hepatic lesions.
Forty-eight patients with focal hepatic lesions (9 metastases, 21 hepatocellular carcinomas, 1 cholangiocarcinoma, 16 hemangiomas, and 2 cysts) underwent single shot EPI with and without a small diffusion-sensitizing gradient (DSG) (beta values = 55 s/mm2) at 1.5 T. Comparison was made with breath-holding T2-weighted fast SE (FSE) sequences.
Lesion-to-liver signal intensity ratio of EPI was significantly better than that of T2-weighted FSE (p < 0.05) in patients with metastasis. Use of DSG suppressed bright signals from vessels or periportal tissue, resulting in better conspicuity of small lesions. EPI with DSG visualized more metastatic deposits than T2-weighted FSE (p < 0.01).
EPI with a small DSG is helpful for detection of small hepatic metastases.
本研究的目的是评估回波平面成像（EPI）作为一种屏气T2加权技术用于肝脏局灶性病变成像的有效性。
48例患有肝脏局灶性病变的患者（9例转移瘤、21例肝细胞癌、1例胆管癌、16例血管瘤和2例囊肿）在1.5T下接受了单次激发EPI检查，分别采用有无小扩散敏感梯度（DSG）（β值 = 55 s/mm2）的序列。并与屏气T2加权快速自旋回波（FSE）序列进行比较。
在转移瘤患者中，EPI的病变与肝脏信号强度比显著优于T2加权FSE（p < 0.05）。使用DSG可抑制血管或门静脉周围组织的明亮信号，从而使小病变显示得更清晰。带有DSG的EPI比T2加权FSE能显示更多的转移灶（p < 0.01）。
带有小DSG的EPI有助于检测肝脏小转移瘤。
