摘要
目的探讨低管电压联合迭代重建(IR)在腹部CTA应用中的可行性及价值。方法选择因怀疑腹部血管性疾病行腹部CTA检查的50例患者,随机分为年龄、体重指数相匹配的A、B两组。A组采用100 k V、IR和滤波反投影(FBP)重建,B组采用120 k V、FBP重建。分别测量A组IR、FBP重建及B组FBP重建的平膈肌下缘水平腹主动脉、左肾动脉开口处和腹主动脉分叉处血管CT值及图像噪声,并计算相应的信噪比(SNR)和对比噪声比(CNR)。分析两组的有效辐射剂量(ED)、A组IR与FBP重建及A组IR与B组FBP重建的CT值、图像噪声、SNR、CNR和图像质量是否有统计学差异。结果 A组IR的图像噪声显著低于FBP重建(P<0.01),SNR和CNR显著高于FBP重建(P<0.01),CT值及图像质量差异均无统计学意义(P>0.05)。A组IR的CT值、SNR和CNR均显著高于B组FBP重建(P<0.01),两者的图像噪声和图像质量差异均无统计学意义(P>0.05);与B组FBP重建相比,A组IR的ED降低40.70%。结论低管电压IR用于腹部CTA能够提供较高质量图像且辐射剂量降低。
Objective To study the feasibility of abdominal CT angiography in low tube voltage combined with iterative reconstruction（ IR）. Methods Fifty patients of suspected abdominal aortic disease were randomly divided into 2 groups which were matched in age and body mass index. 100 k V tube voltage,IR and filtered back projection（ FBP） were used in group A,while 120 k V tube voltage and FBP were used in group B. The CT value and image noise of the abdominal aorta,left renal artery and abdominal aortic bifurcation were measured. Signal to noise ratio（ SNR） and contrast to noise ratio（ CNR） were calculated. The effective radiation dose（ ED）,CT value,image noise,SNR,CNR and image quality between the group A with IR and FBP and also the group A with IR and group B with FBP were analyzed. Results In group A,image noise with IR was significantly lower than that with FBP（ P 〈 0. 01）,the former SNR and CNR were significantly higher than the latter（ P 〈 0. 01）,while there were no significant differences in CT value and image quality（ P 〉 0. 05）.The CT value,SNR and CNR of group A with IR were significantly higher than group B with FBP（ P 〈 0. 01）,while there were no significant differences in image noise and image quality（ P 〉 0. 05）. ED of group A with IR was 40. 70% lower than that of group B with FBP. Conclusion Abdominal CT angiography in low tube voltage combined with iterative reconstruction can provide high quality imaging while radiation dose was reduced.
出处
《临床放射学杂志》
CSCD
北大核心
2016年第4期634-637,共4页
Journal of Clinical Radiology
