1) oral negative contrast agent
口服阴性对比剂
1.
Objective To evaluate the feasibility using ferric ammonium citrate ( FAC ) as a gastrointestinal oral negative contrast agent to null the bowel signal during MR cholangiopancreatography (MRCP) examination of obstructive jaundice patients.
目的评价采用枸橼酸铁铵作为胃肠道口服阴性对比剂对提高梗阻性黄疸患者磁共振胰胆管成像(MRCP)检查质量的作用。
2) oral contrast agent
口服对比剂
1.
The mechanism of action, categorization, imaging characteristics and the value of clinical applications of oral contrast agents in gastrointestinal tract in MRCP are reviewed in this paper.
文章综述磁共振胰胆管成像中胃肠道内口服对比剂的作用机制、分类、成像特点及应用价值。
5) positive agent
阳性对比剂
1.
Objective: To evaluate the diagnosis value and limitation on the preoperative T staging of middle-late stage rectal carcinoma with pelvic spiral(S)CT using positive agent enema.
目的:评估阳性对比剂灌肠螺旋(S)CT盆腔平扫对直肠癌术前T分期的诊断价值和限度。
补充资料:CT对比剂
CT对比剂
影像学术语。CT检查中用以增加病变组织与正常组织间密度差别的对比物质。阴性对比剂提供低密度的对比,主要是空气;阳性对比剂提供高密度对比,主要是水溶性有机碘剂。非水溶性碘剂及非碘制剂偶有使用。水溶性碘对比剂是应用最广泛的CT对比剂,分经肾和经肝排泄含碘造影剂两种。目前CT所用水溶性碘对比剂通常为三碘苯环衍生物,其结构有四种,即离子型单体、离子型双聚体、非离子型单体和非离子型双聚体。
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参考词条