Different contrast injection rate on the analysis of 64-slice spiral CT scan liver arterial phase enhancement

Abstract

Objective To discuss the different contrast injection rate on the 64-slice spiral CT scan liver arterial phase reinforced effect. Methods 60 patients who received abdominal CT scan were selected from January 2014 to April 2015.According to the different conditions, they were divided into control group (30 cases) and liver cirrhosis group (30 cases). Then each group based on packet injection rate into 2.5 mL/s (control group 1, cirrhosis group 1) and 3.5 mL/s (control group 2, cirrhosis group 2). Select Smartprep technology contrast agent tracking all patients, when the abdominal aorta CT value ≥150 HU start scanning.The departure time, CT value of each group were recorded, abdominal aortic artery, simultaneous analysis of each component of image quality comparison. Results When the contrast agent injection rate of 3.5 mL/s, excellent rate of the control group (95.5%) compared with the contrast injection rate of 2.5 mL/s (91.7%) had no significant difference (χ2=0.021, P=0.638); The cirrhosis good rate (94.7%) compared with the contrast agent injection rate of 2.5ml/s (72.7%) had obvious advantages, the difference was statistically significant (χ2=5.233, P=0.032). When the contrast agent injection rate of 2.5mL/s, cirrhosis abdominal aorta average peak enhancement [(187.25±21.00)HU] and the control group [(195.35±19.00)HU] had no significant difference (t=0.826, P=0.436). The average trigger time of the control group (21.68±1.93)s was significantly less than the cirrhosis group (25.13±2.13)s, the difference was statistically significant (t=2.064, P=0.047). When the contrast agent injection rate of 3.5 mL/s, the control group, the mean abdominal aortic peak enhancement [(247.82±39.00)HU] was significantly greater than the cirrhosis group [(223.81±35.00)HU], the difference was statistically significant (t=2.652, P=0.037). The average trigger time of the control group (18.62±1.36)s was significantly less than the cirrhosis group (24.57±0.92)s, the difference was statistically significant (t=3.362, P=0.033). Conclusion The greater the contrast injection rate, arterial peak at the same time it increases the peak time come to shorten.When the contrast agent injection rate consistent with the control group, the average trigger time is short, high average peak enhancement.Cirrhosis needs higher contrast injection rate. Key words: Contrast agent; Cirrhosis; Trigger time; Peak