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目的探讨将idose4迭代重建技术用于肺部低剂量灌注成像的可行性。方法选取26例接受胸部CT灌注扫描的患者,随机分为A组(100kVp,200mAs)和B组(100kVp,100mAs),分别采用idose4技术和FBP进行重建,记录各组的噪声、信噪比(signal-noise-ratio,SNR)、对比噪声比(apparent contrast-to-noise ratio,CNR)和有效剂量(effective dose,ED)。按1~3分评价各组总体图像质量,并对2组结果进行比较。结果比较同一个患者的FBP和idose图像,idose技术明显降低了图像的噪声,提高了图像的SNR、CNR。B组idose后的图像噪声、SNR、CNR与A组FBP图像比较差异均无统计学意义(P>0.05)。B组idose后的图像总体质量与A组FBP重建图像质量差异无统计学意义(P>0.05)。结论运用迭代重建技术进行低剂量肺部CT灌注扫描可获得满足诊断要求的图像。
Objective To explore the feasibility of applying idose4 iterative reconstruction technique to lung low dose perfusion imaging. Methods Twenty-six patients undergoing CT perfusion CT scan were randomly divided into group A (100kVp, 200mAs) and group B (100kVp, 100mAs), and were reconstructed by using idose4 and FBP respectively. The noise and signal- signal-noise-ratio (SNR), apparent contrast-to-noise ratio (CNR) and effective dose (ED). The overall image quality of each group was evaluated by 1 to 3 points and the results of 2 groups were compared. Results Compared with FBP and idose images of the same patient, idose technology significantly reduced the image noise and improved the image SNR and CNR. There was no significant difference in image noise, SNR, CNR and group A FBP images after idose in group B (P> 0.05). There was no significant difference in the quality of image between idose group B and group A FBP reconstructed images (P> 0.05). Conclusion Iterative reconstruction technique can be used to perform low-dose CT perfusion imaging to meet the diagnostic requirements of the image.