低剂量自适应迭代重建技术在低辐射剂量头颈部CT血管成像中的应用  

Application of adaptive iterative dose reduction 3D in low-dose CT angiography of craniocervical arteries

作　　者：张力[1] 徐延峰 郑婧[1] 于淑靖[1] 陈跃峰[1] 车延旭[1] 宋兆伟[1] Li Zhang Yan-feng Xu Jing Zheng Shu-jing Yu Yue-feng Chert Yan-xu Che Zhao-wei Song(Department of CT Diagnosis, Cangzhou Central Hospital, Cangzhou, Hebei 061001, China)

机构地区：[1]河北省沧州市中心医院CT诊断科,河北沧州061001

出　　处：《中国现代医学杂志》2017年第2期81-85,共5页China Journal of Modern Medicine

基　　金：河北省沧州市科技计划项目(No:151302114)

摘　　要：目的探讨低剂量自适应迭代重建技术(AIDR3D)在头颈部CT血管成像(CTA)中对图像质量及辐射剂量的影响。方法行头颈部CTA检查的患者90例,随机分为A、B两组,每组45例。A组扫描参数为120 k V、300 m A,经滤波反投影法(FBP)重建。B组为80 k V、自动毫安,经AIDR 3D重建。对两组图像的噪声、信噪比(SNR)、对比噪声比(CNR)、图像质量主观评分及辐射剂量进行评价。结果 1客观评价:颈总动脉血管噪声值B组低于A组,差异有统计学意义(P<0.05)。颈动脉窦及颈内动脉血管噪声值B组高于A组,差异有统计学意义(P<0.05)。颈部SNR及CNR值B组高于A组,差异有统计学意义(P<0.05)。颅内段血管(MCA1)噪声值A组低于B组,差异有统计学意义(P<0.05)。颅内血管SNR及CNR值B组高于A组(P<0.05)。2主观评价:颈总动脉评分B组高于A组,差异有统计学意义(P<0.05)。两组间颈动脉窦及颈内动脉评分差异无统计学意义(P>0.05)。颅内动脉评分B组低于A组,但B组图像质量均能满足临床诊断要求。3两组有效辐射剂量B组低于A组,差异有统计学意义(P<0.05),B组较A组辐射剂量降低约76%。结论在头颈CTA联合扫描中,使用80 k V和自动毫安调节,并运用AIDR3D迭代重建技术,在获得优质血管图像的同时可降低辐射剂量。Objective To assess the effect of adaptive iterative dose reduction 3D （AIDR3D） on image quality and radiation dosage in CT angiography （CTA） of craniocervieal arteries. Methods Ninety patients who underwent the head and neck CTA examination were divided into group A and group B at random. Each group included 45 patients. In the group A, the scanning parameters were 120 kV and 300 mA, and the images were reconstructed using conventional fihered back projection （FBP）. In the group B, the scanning parameters were 80 kV and Auto- mA and the images were reconstructed using AIDR 3D. All of the images were evaluated on image quality and radiation dose. Results In objective evaluation, the noise level of the group B was significant lower than that of the group A in the common carotid arteries （P 〈 0.05）, but higher than that of the group A in the carotid sinuses and the internal carotid arteries （P 〈 0.05）; neck artery SNR and CNR of the group B were significant higher than those of the group A （P 〈 0.05）. The noise level of the intraeranial arteries （MCA1） in the group A was significantly lower than that of the group B （P 〈 0.05）, but the SNR and CNR of the group B were significantly higher than those of the group A （P 〈 0.05）. In subjective evaluation, the image quality score of the common carotid arteries in the group B was higher than that in the group A （P 〈 0.05）, but there was no significant difference in image quality scoring of the carotid sinuses or the internal carotid arteries （P 〉 0.05）. The score of the group B was lower than that of tile group A in image quality of the intraeranial arteries, but the quality of all the images could meet the-requirenlents of clinical diagnosis. Compared with the group A, the radiation dose in the group B was reduced by 76%, there was significant difference （P 〈 0.05）. Conclusions For CT angiography of cranioeervieal arteries. AIRD 31） reconstruction along with 80 kV and auto-mA modulation produces diagnostic

关 键 词：计算机体层成像 血管造影术 迭代重建 辐射剂量 

分 类 号：R445.3[医药卫生—影像医学与核医学]