上海交通大学学报（医学版）

上海交通大学学报（医学版）

• 论著（临床研究） • 上一篇    下一篇

低剂量结合iDose迭代重建算法在上腹CT扫描中的应用

袁肖娜1，高知玲2，朱凯2，马文东2，陈勇2   

  1. 宁夏医科大学 1.临床医学院， 2.总医院放射科， 银川 750004
  • 出版日期:2015-09-28 发布日期:2015-09-30
  • 通讯作者: 陈勇, 电子信箱: chenyong6981@sina.com。
  • 作者简介:袁肖娜（1989—）, 女， 硕士生; 电子信箱: yuanxiaona1989@163.com。
  • 基金资助:

    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)

Application of low-dose combined with iDose iterative reconstruction in CT scan of upper abdomen

YUAN Xiao-na1, GAO Zhi-ling2, ZHU Kai2, MA Wen-dong2, CHEN Yong2   

  1. 1.School of Clinical Medicine, Ningxia Medical University, Yinchuan 750004, China; 2.Department of Radiology， the General Hospital of Ningxia Medical University, Yinchuan 750004, China
  • Online:2015-09-28 Published:2015-09-30
  • Supported by:

    Innovation Project of Abroad Scholars in Ningxia; Starting Project of Specialists in  Ningxia Medical University, XT201417

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摘要：

目的  比较低剂量与常规剂量扫描滤波反投影（FBP）、iDose1、iDose3、iDose5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mAs基准值较常规剂量组降低20%。采用FBP、iDose1、iDose3、iDose5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iDose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iDose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。

关键词: 上腹CT, iDose迭代重建算法, FBP重建算法, 辐射剂量, 图像质量

Abstract:

Objective  To compare differences of reconstruction with filtered back projection (FBP), iDose1, iDose3, and iDose5 on the quality of CT images of upper abdomen between low-dose CT scan and routine-dose CT scan. Methods  According to the examination order, 60 patients underwent the contrast-enhanced routine-dose CT scan of upper abdomen and another 60 patients underwent the low-dose CT scan of upper abdomen. The automatic tube current technique was adopted and the mAs reference value of portal venous phase of the low-dose group was 20% lower than that of the routine-dose group. CT images of portal venous phase of two groups were reconstructed by filtered back projection, iDose1, iDose3, and iDose5. The noise, signal-to-noise ratio (SNR), and contrast-to-noise ratio (CNR) of images were calculated. The subjective quality (noise, diagnostic acceptability, artifacts, and sharpness) of images was evaluated by 2 radiologists with work experience of more than 5 years. Patients of routine-dose group and low-dose group were divided into two subgroups according to the gender. Volume CT dose index (CTDIvol) and dose length product (DLP) were recorded and effective dose (ED) were calculated. Results  Low-dose CT scan combined with iDose reconstruction could satisfy the diagnostic demand. Compared with the routine-dose group, CTDIvol, DLP, and ED of male patients of the low-dose group decreased 26.39%, 26.71%, and 26.71%, respectively, while those of female patients of the low-dose group decreased 24.52%, 25.27%, and 25.27%, respectively. Conclusion  Low-dose CT scan combined with iDose iterative technique can effectively reduce the radiation dose while meeting the diagnostic quality of images.

Key words: upper abdominal computed tomography, iDose iterative reconstruction algorithm, FBP reconstruction algorithm, radiation dose, image quality