A Comparative Study of Artificial Intelligence Triggering Technique and Traditional Bolus Tracking Triggering Technique in Coronary CT Angiography
Objective To validate the peak vessel enhancement timing of artificial intelligence(AI)trigger technique in Coronary CT angiography(CCTA)and compare its subjective and objective image quality against the traditional bolus tracking technique.Methods In this prospective study,204 patients were serially divided into two groups to perform CCTA scans:traditional bolus tracking technique featuring a fix post-trigger delay(PTD)(Group A)or Al trigger technique featuring a patient-specific PTD(Group B).All CT(tube voltage 100kV combined with intelligent tube current adjustment technology of CARE Dose 4D)and contrast media protocol parameters(320 mgl/mL;0.7mL/kg)were kept identical between groups.One reader evaluated objective image quality,while two readers rated subjective image quality in 5-point Likert scale.Objective image quality was compared between groups via two-sample t-test,while the subjective ratings were compared with chi-square analysis.Results There were 102 patients in both groups(mean age 50±10 years in group A;mean age 51±9 years in group B).The baseline characteristics were equivalent between groups(all P＞0.05).Both readers rated better subjective image quality for the patient-specific PTD group(P＜0.001).The mean vessel enhancement was significantly higher in group B in all coronary vessels(all P＜0.05).Conclusion Compared with fixed PTD,patient-specific PTD could achieve reliable scan timing,optimize vessel opacification and obtain better image quality in CCTA.
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