Screening of Coronary Artery Calcification Using Digital Radiograhpy with Dual-energy Subtraction Chest:Compared with Multi-detector Row CT / 实用放射学杂志

ABSTRACT

Objective To evaluate the diagnostic accuracy of dual-energy subtraction chest digital radiography(DR) for detecting coronary artery calcification as compared with multi-detector row CT(MDCT).Methods 35 patients underwent dual-energy subtraction chest DR and ECG-gated MDCT for detection of coronary artery calcifications.The radiation dose of both DR and CT were noted respectively.Two senior and two junior radiologists reviewed the radiogram and assessed the calcifications in LAD,LCX and RCA totaling 105 vessels.ROC curve plotting were used for evaluation with CAC calculated from MDCT as the gold standard.Paired t test was calculated to compare the different radiation dose between DR and CT.Results 27.6% vessels(29/105) showed calcification on DR.The positive incidence in LAD was 48.5%(17/35),LCX 22.8%(8/35),and RCA 11.4%(4/35).The ROC area was 0.866,0.854,0.725,0.642 respectively,with a CAC score of more than 300.The average radiation dose was 0.469?0.22 mGy for DR,and 12.29?1.40 mGy for MDCT,showing significant differences.Conclusion Chest DR with dual energy subtraction can be used for screening of coronary artery calcification with relatively higher sensitivity for LAD.