Revolution CT单能量成像联合低管电流、个体化剂量及ASiR技术在头颈部CTA中的应用价值研究

目的探讨Revolution CT单能量成像联合低管电流、个体化剂量及自适应统计迭代重建(ASi R)技术在头颈部CT血管成像(CTA)中的应用价值。方法将60例临床疑诊头颈部血管疾病需行头颈部CTA检查的患者分为64排常规螺旋CT扫描组、256 Revolution CT单能量成像联合低管电流、个体化剂量及ASiR技术组各30例。对两组图像进行主观及客观评分。记录两组扫描的剂量长度乘积(DLP)。结果研究组主动脉弓、颈动脉分叉处及大脑中动脉M1段CT值均高于常规组,差异具有统计学意义(P<0.05)。研究组DLP及有效辐射剂量(ED)明显低于常规组,差异具有统计学意义(P<0.05)。研究组平均碘对比剂用量及碘负荷低于常规组,差异具有统计学意义(P<0.05)。两组图像噪声及图像质量主观评分无统计学意义(P>0.05)。两组图像主动脉弓、颈动脉分叉处及大脑中动脉M1段的信噪比(SNR)、对比信噪比(CNR)的差异无统计学意义(P>0.05)。结论Revolution CT单能量成像联合低管电流、个体化剂量及ASiR技术可获得符合临床诊断标准的头颈部血管图像,同时可明显降低辐射剂量及碘对比剂用量。

Application Value of Revolution CT Monochromatic Imaging Combined with Low Tube Current,Individualized Dose and ASiR in Head and Neck CTA

Objective To explore the application value of Revolution CT monochromatic imaging combined with low tube current,individual dose and Adaptive Statistical iterative Reconstruction(ASiR)technology in CT angiography(CTA)of head and neck.Methods Sixty patients with clinically suspected head and neck vascular disease who required head and neck CT angiography were divided into a 64-row conventional spiral CT scan group,256 Revolution CT monochromatic imaging combined with low tube current,individualized dose,and ASiR technology group,30 patients each.Subjectively and objectively score the two groups of images.Record the dose length product(Dose length product,DLP)of the two scaans.Results The CT values of the aortic arch,carotid bifurcation,and M1 segment of a middle cerebral artery in the study group were higher than those in the conventional group,and the difference was statistically significant(P<0.05).The DLP and effective radiation dose(ED)of the study group were significantly lower than those of the conventional group,and the difference was statistically significant(P<0.05).The average iodine contrast agent dosage and iodine load in the study group were lower than those in the conventional group,and the differe n ce was statistically significa nt(P<0.05).The comparison of subjective scores of image noise and image quality between the two groups was not statistically significant(P>0.05).There was no statistically significant difference in the signal-to-noise ratio(SNR)and contrast signal-to-noise ratio(CNR)of the aortic arch,carotid artery bifurcation,and middle cerebral artery M1 between the two groups of images(P>0.05).Conclusion Revolution CT monochromatic imaging combined with low tube current,individualized dose,and ASiR technology can obtain head and neck blood vessel images that meet clinical diagnostic standa rds while significa ntly reducing radiation dose and iodine contrast agent dosage.