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《Radiologic Practice》 2018-04
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Feasibility study of thoracic axial scans with 16cm wide-detector scanner in triple-rule-out CT angiography

CHEN Yu-huan;HE Tai-ping;JIA Yong-jun;Department of Radiology,Shaanxi University of Traditional Chinese Medicine;  
Objective:To investigate the feasibility of using two consecutive axial scans in the triple-rule-out(TRO)examination for chest pain on a 16 cm wide-detector CT system.Methods:Forty patients with acute chest pain underwent TRO scan and were assigned to study group(Group A,n=20)and control group(Group B,n=20).Bolus tracking in both groups were used.For Group A,the pulmonary artery,coronary artery and aorta were scanned in succession in axial mode.For Group B,pulmonary artery was scan by helical mode,then the coronary artery was scanned after 7 seconds delay,followed immediately by scanning of aorta in an helical mode.The subjective and objective evaluation of image quality[including CT value and contrast noise ratio(CNR)of the thoracic aorta,pulmonary artery and coronary artery]and effective radiation dose(ED)in the two groups were compared.Results:There was no statistical difference in the subjective and objective image quality between the two groups(all P0.05).However,there was significant difference(t=-3.132,P=0.003)in total ED between group A and group B [(3.3±1.20)vs(5.6±0.7)mSv],there was 40.3% effective dose reduction when using the two-consecutive axial scanning mode.Conclusion:Using two consecutive axial scans in triple-rule-out(TRO)CTA at a 16 cm wide-detector CT scanner can reduce radiation dose while maintaining image quality compared with the conventional TRO scanning protocol.
【CateGory Index】: R816.2
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