Objietive:To explore the quantitative analysis of abdominal aortic calcification(AAC)using Revolution CT low dose scanning.Methods:The imaging data of CT urography(CTU)accompanied with abdominal aortic calcification in the General Hospital of Ningxia Medical University from September 2021 to March 2022 was collected.GSI scanning mode combined with the adaptive sta-tistical iterative reconstruction-Veo algorithm(ASiR-V)was used in CT scanning without contrast,and the routine plain scan was used in the excretory phase.The optimal ASiR-V weight was performed on the original image of the energy spectrum(group A),and FBP reconstruction was performed on routine scanning(group B).The abdominal aortic calcification index(AACI),abdominal aortic CT val-ue,SD value,and abdominal aortic calcification parameters(calcification volume,average calcification concentration)in group A were measured in 35 cases.The Calcification quality score,signal-to-noisera-tio(SNR)and contrast noise ratio(CNR)were calculated.The image quality of two groups was scored by 2 doctors subjectively.The AACI,CT value,SD value,SNR,and CNR were compared be-tween two groups using independent sample t-test.Pearson correlation analysis was used to analyze the parameters of abdominal aorta calcification in group A and AACI in group B,and the radiation dose of the two groups was analyzed.Results:There was no significant difference between the AACI(0.20±0.03)in group A and AACI(0.18±0.03)in group B(P＞0.05);The calcification volume,average calcification concentration,and mass score in group A were positively correlated with AACI in group B(r values were 0.926,0.513 and 0.877,respectively,P＜0.05);The difference of SNR and CNR be-tween two groups were statistically significant(P＜0.05),and the difference of subjective score be-tween two groups was statistically significant(P＜0.05);The effective radiation dose(6.36±0.26)mSv in group A was 29.3％lower than in group B(8.99±0.20)mSv(P＜0.05).Conclusion:Revolution CT can provide quantitative information for abdominal aortic calcification using various methods.The measurement process is simple and time-saving,so it is suitable for routine clinical applications.Low dose scanning schemes can reduce patients'radiation dose and may improve image quality.
关键词
腹主动脉钙化/体层摄影术,X线计算机/能谱CT/辐射剂量/图像质量评估
Key words
Calcification of abdominal aorta/Tomography,X-ray computed/Energy spectrum CT/Radiation dose/Image quality assessment
维普
万方数据