The feasibility study of different scan protocols in coronary CT angiography of overweight patients based on wide-detector
10.3969/j.issn.1002-1671.2024.07.028
- VernacularTitle:基于宽体探测器不同扫描方案在超重患者冠状动脉CT血管成像中的可行性研究
- Author:
Zhichao LIU
1
;
Sai ZHAO
;
Zepeng MA
;
Yiwen LIU
;
Xueran LI
;
Mengyi CAI
;
Yongxia ZHAO
Author Information
1. 华中科技大学同济医学院附属协和医院放射科,湖北 武汉 430022
- Keywords:
coronary computed tomography angiography;
tube voltage;
contrast medium;
image quality;
radiation dose
- From:
Journal of Practical Radiology
2024;40(7):1160-1164
- CountryChina
- Language:Chinese
-
Abstract:
Objective To investigate the image quality,radiation dose and contrast medium(CM)intake in coronary computed tomography angiography(CCTA)of overweight patients based on wide-detector using different tube voltages and CM of different concentrations.Methods A total of 150 overweight patients[body mass index(BMI)≥ 25 kg/m2]who underwent CCTA were divided into three groups according to scan protocols:group A(120 kVp,370 mg I/mL CM),group B(100 kVp,350 mg I/mL CM),and group C(80 kVp,320 mg I/mL CM),with each group had 50 patients.The mean CT value,mean signal-to-noise ratio(SNR),mean contrast-to-noise ratio(CNR),figure of merit(FOM)of all images were measured and calculated.Images were assessed using a 5-point scale by two radiologists.The volume CT dose index(CTDIvol)and dose length product(DLP)of each patient were recorded and the effective dose(ED)was calculated.The total iodine intake values of patients in three groups were calculated.The above data were statistically analyzed by one-way ANOVA.Results The mean CT value,mean SNR,mean CNR,and mean subjective score of groups B and C were significantly higher than those of group A(P＜0.001),but there was no significant difference between groups B and C(P＞0.05).The FOM value of groups B and C was significantly higher than that of group A(P＜0.001),and the FOM value of group B was significantly lower than that of group C(P＜0.001).The total iodine intake values of groups B and C was significantly lower than that of group A(P＜0.001).The ED and total iodine intake values in groups B and C were 30.34％,68.53％and 10.22％,16.85％lower than those in group A,respectively(P＜0.001).Conclusion Under the premise of ensuring image quality,the lower tube voltage and lower concentration of CM based on wide-detector allows for significant reduction in radiation dose and total iodine intake in CCTA for overweight patients compared to routine scan protocols.
