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目的：应用Smartprep技术对主动脉、门静脉及肝实质的强化进行研究，探讨其在肝脏检查中的应用价值。材料与方法：80例正常人随机分为二组，对照组选用60秒固定的延迟时间行肝脏扫描，另一组为Smartprep组。另有40例为病例组，也采用Smartprep技术行肝脏检查，观察肝脏强化的程度和延迟时间。对主动脉和门静脉到达强化峰值的时间也进行了观察和统计。结果：Smartprep正常人组中，92．5％达到或超过阈值，平均延迟时间为63．3±7．66秒（49～78秒）。对照组中77．5％达到或超过阈值，病例组中仅40％达到或超过阈值，平均延迟时间为76．2±8．65秒（58～89秒）。主动脉到达强化峰值的时间为20～45秒，平均32．2±8．1秒。结论：应用Smartprep技术可根据每个患者的不同情况选择理想的扫描时间窗，消除个体差异的影响，使肝脏获得最大程度的强化，从而有利于病灶的检出。有血循环障碍和明显影响肝实质强化的因素时，Smartprep的应用尤为重要。同时也进一步证明，肝动脉期的延迟时间可选用30秒，门脉期的延迟时间宜选用50～60秒，有影响肝实质强化的因素存在时，以65～75秒为宜。
Objective: To study the enhancement of the aorta, portal vein and liver parenchyma using Smartprep technique and to explore its value in the liver examination. Materials and Methods: Eighty normal subjects were randomly divided into two groups. The control group received a liver scan with a fixed delay of 60 seconds and the other group was the Smartprep group. Another 40 cases for the case group, also using the Smartprep technology liver examination to observe the degree of liver enhancement and delay. The time when the aorta and portal vein reached the peak of intensification was also observed and statistically analyzed. RESULTS: Of the Smartprep normal subjects, 92.5% met or exceeded the threshold with an average delay of 63.3 ± 7.66 seconds (49-78 seconds). In the control group, 77.5% met or exceeded the threshold, and only 40% of the cases met or exceeded the threshold with an average delay of 76.2 ± 8.65 seconds (58-89 seconds). Aortic peak time to reach the intensive 20 to 45 seconds, an average of 32.2 ± 8.1 seconds. Conclusion: Using Smartprep technology can select the ideal scanning time window according to the different conditions of each patient to eliminate the influence of individual differences and maximize the enhancement of the liver, which is beneficial to the detection of lesions. The use of Smartprep is especially important when there are circulatory disorders and factors that significantly affect liver parenchymal enhancement. At the same time, it is further proved that the delay time of the hepatic artery phase can be used for 30 seconds, and the delay time of the portal phase should be chosen for 50-60 seconds. When the factors affecting the hepatic parenchyma exist, 65-75 seconds is suitable.