摘要
目的 :分析肝转移瘤多层螺旋CT(MSCT)多期扫描的影像表现 ,并评价其诊断价值。方法 :回顾性分析长征医院 2 0 0 2年 1～ 6月 82例患者 458个肝转移瘤灶的多期扫描图像。检查机型MarconiMX 80 0 0多层螺旋CT ,有效层厚5mm ,螺距为 1 .2 5 ,常规平扫后动态三期扫描 ,高压注射器团注法 ,采用非离子型对比剂 (30 0mgI/ml) ,用量 80～ 1 0 0ml。结果 :肝转移瘤CT表现绝大多数为多发病灶 ,少数为单发 ;呈圆形或类圆形低密度结节 ,少数为等密度 ,边缘模糊或清楚 ,直径 1～ 3cm。强化模式呈多样性 ,以边缘环形强化、内部低密度强化为主要特征 ,门脉期病灶显示更清楚 ,因而更易发现病灶。部分瘤灶内可见条状、结节或团块状强化影。结论 :多层螺旋CT扫描速度快 ,分辨率高 ,能获得精确的多期肝脏扫描图像 ,有利肝转移瘤的检出及病灶特征的显示 ,可反映病灶的血供 。
Objective:To evaluate the manifestations of liver metastasis by MSCT with multiple phases scanning.Methods:The multiple phases scanning of MSCT was performed in 82 patients with 458 lesions of liver metastasis during January to June in 2002 in ShangHai ChangZheng Hospital.The facility was Marconi MX8000 MSCT and the scanning parameters were slice thickness of 5mm,and pitch of 1.25.The plain scan was followed by dynamic three phase scan with bolus injection of non ionic contrast agent(300mgI/ml) at a dose of 80～100ml by high pressure injector.Results:The CT imaging of liver metastasis showed mostly multiple lesions,which appeared as round or round like low density with clear or hazy margin in 1～3cm diameter.The enhancement patterns were variable and characterized mainly of circle enhancing with interior low density.The lesion was demonstrated more clearly and easily detected in portal phase.Conclusion:MSCT can achieve multiple phases images of liver with rapid scanning and high resolution,which is helpful for the detection and characterization of liver metastasis as well as the visualization of blood supply to the lesion.And portal phase scanning can improve the detectability of the lesion.
出处
《放射学实践》
2003年第5期354-356,共3页
Radiologic Practice
