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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 investigate the feasibility and value of low voltage combined with iterative reconstruction (IR) in the application of abdominal CTA. Methods Fifty patients who underwent CTA for suspected abdominal vascular disease were randomly divided into A and B groups with matched age and body mass index. Group A was reconstructed with 100 kV, IR and filtered back projection (FBP), and group B was reconstructed with 120 kV and FBP. The CT values and image noise of the abdominal aorta, the opening of the left renal artery and the bifurcation of the abdominal aorta were measured respectively by IR, FBP reconstruction and FBP reconstruction of Group B, and the corresponding signal-to-noise ratio SNR) and contrast noise ratio (CNR). The effective radiation dose (ED), the group A IR and FBP reconstruction and the group A IR and group B FBP reconstruction CT value, image noise, SNR, CNR and image quality were analyzed statistically. Results The image noise of IR in group A was significantly lower than that in FBP reconstruction (P <0.01). The SNR and CNR were significantly higher than those in FBP reconstruction (P <0.01). There was no significant difference in CT value and image quality (P> 0.05). The CT value, SNR and CNR of IR in group A were significantly higher than those in group B (P <0.01). There was no significant difference in image noise and image quality between group A and group B (P> 0.05) The ED of Group A decreased by 40.70%. Conclusions Low-tube voltage IR for abdominal CTA can provide higher quality images with lower radiation dose.