Conclusions It is the fist choice to use water as contrast medica-ment for stomach and intestines in the inspect of the jaundice block with Spiral CT It is the best to use small altemation in Picture rebuilding in order reduce erroneous diagnosis.

• 结论螺旋CT检查梗阻性黄疸,胃、肠对比剂以清水为首选。 图像重建以小间隔薄层减少漏诊误诊。