低剂量结合iDose迭代重建算法在上腹CT扫描中的应用

发布时间：2019-05-05 07:58

【摘要】：目的比较低剂量与常规剂量扫描滤波反投影(FBP)、i Dose1、i Dose3、i Dose5重建对上腹部CT图像质量影响的差异。方法按照就诊顺序,对60例患者行常规剂量上腹CT增强扫描,60例行低剂量上腹CT增强扫描。采用自动管电流调控技术,低剂量组门静脉期m As基准值较常规剂量组降低20%。采用FBP、i Dose1、i Dose3、i Dose5分别对两组门静脉期的图像进行重建。计算图像的噪声、信噪比(SNR)及对比噪声比(CNR)。两名具有5年以上工作经验的医师评价图像的主观质量(噪声、诊断可接受性、伪影及锐利度)。分别将常规剂量、低剂量组按照性别分为两组,记录容积CT剂量指数(CTDIvol)、剂量长度乘积(DLP),计算有效剂量(ED)。结果低剂量扫描结合i Dose重建后图像均能满足诊断要求,与常规剂量组相比,男性低剂量组CTDIvol、DLP、ED分别降低26.39%、26.71%、26.71%,女性分别降低24.52%、25.27%、25.27%。结论低剂量扫描结合i Dose迭代技术可以在满足图像诊断质量的前提下有效降低辐射剂量。
[Abstract]:Objective to compare the effect of low-dose and conventional dose-filtered back-projection (FBP), i Dose1,i Dose3,i Dose5 reconstruction on the quality of upper abdominal CT images. Methods according to the order of visit, 60 patients underwent conventional dose enhanced CT scan and 60 patients received low dose enhanced CT scan. The standard value of m-As in portal vein phase of low dose group was 20% lower than that of normal dose group by using automatic tube current control technique. The portal phase images of the two groups were reconstructed by FBP,i Dose1,i Dose3,i Dose5. Calculation of Image noise, signal-to-noise ratio (SNR) and contrast noise ratio (CNR). Two physicians with more than 5 years working experience evaluated the subjective quality of images (noise, diagnostic acceptability, artifact and sharpness). The normal dose group and low dose group were divided into two groups according to sex. The volume CT dose index (CTDIvol), dose length product (DLP), was used to calculate the effective dose (ED). Results after low-dose scanning combined with I-Dose reconstruction, the CTDIvol,DLP,ED of low-dose group decreased 26.39%, 26.71%, 26.71%, 24.52%, respectively, compared with that of normal dose group, and that of low-dose group decreased 26.39%, 26.71%, 26.71%, 24.52%, respectively. 25.27%, 25.27%. Conclusion low-dose scanning combined with I-Dose iterative technique can effectively reduce the radiation dose on the premise of satisfying the quality of image diagnosis.
【作者单位】：宁夏医科大学临床医学院;宁夏医科大学总医院放射科;
【基金】：宁夏留学人员创新创业项目宁夏医科大学特殊人才启动项目(XT201417)~~
【分类号】：R816.5

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