Feasibility of low radiation dose and low contrast dosage for triple-rule-out CT angiography of chest pain on the 320-row detector CT
10.3969/j.issn.1002-1671.2024.09.031
- VernacularTitle:320排探测器CT双低剂量胸痛三联征CT血管成像扫描方案对急性胸痛的可行性分析
- Author:
Linxi ZHOU
1
;
Xiaodan YE
;
Shuyi YANG
;
Lijun ZHANG
;
Liang CHEN
;
Heng ZHOU
;
Jing LI
;
Cheng YAN
Author Information
1. 复旦大学附属中山医院放射诊断科,上海 200032
- Keywords:
computed tomography;
triple-rule-out computed tomography angiography;
low-dose detection method;
pulmonary artery;
coronary artery;
aorta
- From:
Journal of Practical Radiology
2024;40(9):1532-1535
- CountryChina
- Language:Chinese
-
Abstract:
Objective To invesigate the feasibility of low radiation dose and low contrast dosage in triple-rule-out computed tomo-graphy angiography(TRO-CTA)on the 320-row detector CT.Methods A total of 120 patients who underwent CTA were prospec-tively selected.All patients were divided into control group(n=90)and experimental group(n=30).The control group employed standard-doses protocol of pulmonary CTA(120 kV tube voltage,45 mL contrast dosage),coronary CTA(120 kV,50-60 mL),and aortic CTA(120 kV,75 mL),while the experimental group received TRO-CTA with 100 kV and 70-80 mL.The peak time of contrast dosage at the pulmonary artery and aorta was measured by low-dose detection method in the experimental group,and the contrast examination was performed sequentially in the control group.Subjective scores and objective image quality of the pulmonary artery,coronary artery,and aorta in the experimental group and the control group were measured and compared,respectively.The effective dose(ED)between the two groups were recorded and compared.Independent samples t-test and Fisher exact probability were used to analyze the statistical differences between the above measures.Results There were no significant differences in CT values,con-trast-to-noise ratio(CNR),signal-to-noise ratio(SNR)of pulmonary artery,coronary artery and aorta between the two groups(P＞0.05).The mean subjective scores of pulmonary artery,coronary artery and aorta segments in the two groups were not less than 3 points,meeting the requirement of clinical diagnosis.There was no statistical difference in subjective scores between the two groups(P＞0.05).There was statistically significant difference in ED between the two groups(P＜0.05).The ED of pulmonary artery,coronary artery,and aorta in the experimental group were 11.49％,13.33％,and 11.46％significantly lower than those in the control group,respec-tively.Conclusion It is feasible to obtain TRO-CTA images used by the low radiation dose and low contrast dosage on the 320-row detector CT,and radiation dose and contrast dosage can be reduced reasonably without alterations of TRO-CTA images quality in clinical practice.
