Reduction of cardiac motion artifact in step-and-shoot coronary CT angiography with third-generation as compared with secondgeneration dual-source CT scanners

Özet

PURPOSEWe aimed to compare the effects of misregistration (stair-step artifact) occurrence duringcoronary computed tomography angiography (CCTA) using third- and second-generationdual-source computed tomography (DSCT) scanners.METHODSCCTA was performed in consecutive patients with suspected coronary heart disease. Patientswere randomly assigned to two groups and imaged using a third-generation (n=68; groupA) or second-generation (n=63; group B) DSCT scanner. Heart rate (HR), heart rate variability(HRV), the number of acquisition steps required, and the anatomical cardiac length of eachpatient were recorded and compared between the two groups. Qualitative interpretation andanalyses were scored with respect to subjective image quality and misregistration (stair-stepartifact) by two interpreters. Cohen’s kappa was used to evaluate the consistency betweenthe observers.RESULTSAll CCTA images (100%) on both DSCT scanners yielded satisfactory image quality, with asubjective image quality score of 4.21±0.17. The consistency between the two observers withrespect to misregistration and subjective scores were good (κ= 0.91 and 0.92, respectively).Both the number of acquisition steps required and the scan length of each patient in group Adiffered significantly (p 0.20).CONCLUSIONAs compared with second-generation DSCT, the reduced number of acquisition steps required and the shorter scan length in third-generation DSCT reduced the occurrence of misregistration artifacts in CCTA images