目的 探索螺旋CT胃黏膜成像技术，确定胃黏膜螺旋CT扫描最佳成像方案。方法 选择160例上腹部螺旋CT增强的病 人进行分组对比研究。第一步：随机60人分三组每组20人应用螺旋CT采取同剂量、同注射速度80ml(3ml/s)，不 同动脉期时间：早期(18s)、中期(25s)、晚期(30s)扫描对比效果，确定最佳动脉期时间；第二步：剩余100人随 机分五组每组20人同用前期试验最佳时间,用不同剂量、注射速度分别：60ml(3ml/s)、60ml(4ml/s)、80ml(4ml/ s)、100ml(3ml/s)、100ml(4ml/s)与前期试验80ml(3ml/s)对比效果。结果 第一步动脉中期(25s)扫描效果佳例 数18例(90%)，与动脉早期(18s)5例(25%)、动脉晚期(30s)6例(30%)相比明显较高(P<0.05)；第二步动脉中期 (25s)80ml(3ml/s)效果佳例数18例(90%),与其它不同对比剂剂量、对比剂注射速度组比较有显著差异(P<0.01)。结 论 胃黏膜螺旋CT扫描最佳成像方案是：动脉期中期(25s)、对比剂剂量80ml、对比剂注射速度3ml/s扫描。

Objective To explore the spiral CT gastric mucosa imaging technology, to determine the best gastric mucosa spiral CT scanning imaging program. Methods Step 1:60 people were randomly divided into three groups. 20 people in each group were randomly divided into three groups. The optimal arterial period was determined by using the same dose and the same injection speed of 80ml (3ml/s) with different arterial stages: early (18s), middle (25s) and late (30s). Step 2: the remaining 100 people were randomly divided into five groups, and each group was divided into 5 groups. The optimal time of the early trial was divided into 5 groups, with different doses and infusion speed: 60ml (3ml/s), 60ml (4ml/s), 80ml(4ml/s), 100ml(3ml/s) and the optimal time group in the early trial of 80ml(3ml/s). Results There were 18 cases (90%) with good scanning effect at middle stage (25s) of the first step, which was significantly higher than 5 cases (25%) in early stage (18s) and 6 cases (30%) in late stage (30s) (P=0.045(P<0.05). Step 2 middle arterial (25s)80ml (3ml/s) effect of 18 cases (90%) was significantly different from other groups with different contrast dose and contrast agent injection speed (P=0.0065(P<0.01). Conclusion The optimal imaging scheme for spiral CT scanning of gastric mucosa is: arterial phase (25s), contrast dose (80ml), and contrast infusion speed (3 ml/s).