Purpose:To investigate the value of a 16 cm volume scanning mode in angiographic imaging of the left atrium and pulmonary vein in patients with atrial fibrillation(AF).Methods:Sixty AF patients who underwent CT angiography(CTA)examination before radiofrequency ablation were randomly divided into two groups:group A and group B.In group A,The 16 cm volume scanning mode with a tube voltage of 100 kV and automated tube current modulation was utilized.In group B,an ECG-gated spiral scanning mode was used,with all other scanning parameters identical to those in group A.The scan range for both groups extended from 2 cm above the tracheal carina to the diaphragmatic floor of the heart.Image quality,dose length product(DLP),and effective dose(ED)were statistically analyzed for both groups.Results:When heart rates were above 75 beats per minute,group A demonstrated significantly higher image quality than group B(P＜0.05).At heart rates of 75 beats per minute or below,there was no significant difference in image quality between the groups.The radiation dose for group A was(4.01±2.82)mSv,compared to(8.51±0.60)mSv for group B,reflecting a reduction of approximately 53％in group A.Additionally,the contrast agent iodine dose used in group A was about 50％lower than that in group B.Conclusion:The 16 cm volume scanning mode can provide high-definition,low-dose images of the left atrium and pulmonary veins at variable heart rates,offering significant clinical value for pre-ablation assessment in AF patients.
万方数据
维普
