直肠壁腔内线圈及相控阵线圈MRI的对比研究  

Comparative Study of Intracavitary Coil and Phased-array Coil with MRI in Rectal Wall

作　　者：邱大胜[1] 徐宁[1] 陈宪[1] 孔祥泉[2] 

机构地区：[1]湖北省肿瘤医院放射科,武汉430079 [2]华中科技大学同济医学院附属协和医院放射科,武汉430022

出　　处：《放射学实践》2009年第3期297-299,共3页Radiologic Practice

基　　金：湖北省科技部科技攻关项目(2007AA301B25-4)

摘　　要：目的:探讨直肠腔内表面线圈和相控阵线圈MRI对直肠壁组织结构的显示及临床意义。方法:18例直肠癌行全直肠系膜筋膜切除术(TME)患者,术前行高分辨MRI,并在直肠癌切除术后0.5h内对标本行腔内表面线圈MRI,将MRI表现与组织学结构进行对照分析。结果:在体直肠横断面高分辨MR T2WI:14例显示直肠壁两层结构,分别表现为高信号黏膜及黏膜下层和低信号浆肌层,4例无法分辨直肠壁分层结构。直肠癌术后离体标本腔内表面线圈MR T2WI:15例可以清晰显示直肠壁5层组织学结构:黏膜层呈稍高信号,黏膜肌层呈稍低信号,黏膜下层亦呈稍高信号,固有肌层与黏膜肌层信号相似呈低信号,浆膜呈稍高信号;3例5层结构显示不清。结论:直肠腔内表面线圈T2WI可以区分直肠壁5层结构,优于相控阵线圈,随着线圈制造工艺和技术的提高,腔内表面线圈MRI显示直肠壁组织学结构将会更清晰。Objective： To study the displaying of histological structure of the rectal wall by intracavitary coil and phased-array coil MRI and its clinical value. Methods： Eighteen patients with rectal cancer underwent HR-MRI using phased-array coil preoperatively and conventional MRI using intracavitary coil postoperatively within 0.5h （TME surgery）. No patients underwent radiation therapy before operation. MR findings were compared with histology of the resected specimens. Results： The rectal wall consisted of tunica mucosa, museularis rnucosae, tunica submueosa, muscularis propria and tunica serosa by histological anatomy. Two layers of rectal walls were shown on axial plane with FSE T2 WI in vivo HR MRI in 14 patients. They were high signal layer and low signal layer. Tunica mucosa, muscularis mucosae and tunica suhmucosa were high signal layers. Museularis propria and tunica serosa were low signal layers. The layers of the rectal wall were vague in 4 patients. The walls of rectum presented five layers on axial plane with FSE T2WI ex vivo MRI in 15 rectal specimens u sing intracavitary coil. Tunica mucosa and tunica submueosa presented high signals. Museularis mucosae and muscularis propria presented low signals. Tunica serosa presented high signals in ex vivo MRI by intracavitary coil. The layers of the rectal wall were vague in 3 specimens. Conclusion：Since rectal lumen surface coil can discriminate five layers of rectal wail in ex vivo MRI,it is better than phased-array coil in displaying the wall of rectum. With the improvement of the technique on coil, the resolution of the histological structure of the rectal wall displayed by surface coil will be higher than before.

关 键 词：直肠肿瘤 磁共振成像 组织学 

分 类 号：R445.2[医药卫生—影像医学与核医学] R574.63[医药卫生—诊断学]