扫描模式对胸主动脉CTA成像质量和辐射剂量的影响OA

Objective:This study aimed to compare the effects of different scanning modes on image quality and radiation dose in thoracic aortic computed tomography angiography(CTA).Methods:The image quality and radiation dose of 30 cases of thoracic aortic CTA(Group 1,control group),30 cases of retrospective CTA diastolic phase(Group 2)and systolic phase(Group 3),and 30 cases of wide-exposure pulse prospective electrocardiogram(ECG)(Group 4)were retrospectively analyzed.The CT value,noise,contrast-to-noise ratio(CNR),signal-to-noise ratio(SNR),and radiation dose(volume CT dose index(CTDIvol))were recorded and measured.The image quality was evaluated subjectively using the four points method.The subjective and objective indicators were analyzed statistically.Results:No differences were observed in the objective indexes of noise,CNR and SNR among the groups.The subjective score of pairwise comparison of Groups 2-4 was significantly higher than that of Group 1,and no difference was observed among Groups 2-4.The CTDIvol values of the non-gated group(Group 1),retrospective gated groups(Groups 2 and 3),and prospective gated group(Group 4)were 13.70(11.87,16.58),12.62(10.03,15.01),and 11.54(8.92,15.56),respectively,without a statistically significant difference.