Objective:To explore the application value of the new generation intelligent optimal tube voltage technology(kV Assist 2.0)combined with automatic tube current modulation in abdominal pelvic CT examination.Methods:474 patients who underwent plain abdominal pelvic CT scan were prospectively collected and randomly divided into three groups,including 154 cases in the control group,164 cases in the fixed NI group and 156 cases in the automatic NI group.All scanning used automatic milliampere modulation technology.The size of patients(AP+LAT)was recorded while scanning in fixed NI group and automatic NI group.The thin-layer images were transmitted to the workstation for analysis.The SNR and CNR of liver,spleen and gluteus maximus and CTDI,DLP,ED values were measured and calculated.The image quality and radiation dose were analyzed by one-way ANOVA.Results:The noise,liver SNR,liver CNR,spleen SNR,muscle SNR and muscle CNR of the three groups had no statistical differences(all P>0.05),while the spleen CNR of the three groups had a statistical difference(F=3.03,P=0.049),and the post-hoc comparison showed that there was only a statistical difference of the spleen CNR between the fixed NI group and the control group(P=0.014).The subjective score had no significant difference among the three groups(P<0.05).The CTDI of the three groups had the statistical difference(F=12.306,P<0.001),and the post-hoc comparison showed that there were statistical differences between the control group and the fixed NI group and between the control group and the automatic NI group(both P<0.001).DLP and ED of the three groups had statistical differences(both P<0.05),and the post-hoc comparison showed that there were statistical differences between the control group and the fixed NI group and between the control group and the automatic NI group(P=0.003,0.008).The ED in the fixed NI group decreased by 12.4%compared with the control group,while the ED in the automatic NI group decreased by only 9.0%compared with the control group.Conclusions:The scanning strategy of fixed NI can significantly reduce the radiation dose on the basis of slightly improved image quality,and is more valuable in the abdominal pelvic CT scanning of kV Assist 2.0.
Tomography,X-ray computedIntelligent optimal tube voltage technologyRadiation dosageImage quality
万方数据
维普
