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EVALUATION OF MODEL-BASED ITERATIVE RECONSTRUCTION IN ABDOMINAL COMPUTED TOMOGRAPHY IMAGING AT TWO DIFFERENT DOSE LEVELS
Radiation Protection Dosimetry ( IF 1 ) Pub Date : 2021-01-14 , DOI: 10.1093/rpd/ncab010
E Hettinger 1 , M-L Aurumskjöld 2, 3 , H Sartor 1, 4 , F Holmquist 1 , D Svärd 1 , P Timberg 2, 3
Affiliation  

The purpose of this study was to qualitatively evaluate recently introduced Model-based iterative reconstruction method (IMR) and routinely used iterative reconstruction algorithm iDose4 to investigate future dose reduction possibilities for abdominal CT exams. The study contained data from 34 patients who underwent abdominal CT in SkåneUniversityHospital Lund, Sweden. A low-dose scan (CTDIvol3.4 mGy) reconstructed with both iDose4 and IMR and a standard-dose scan (CTDIvol 5.3 mG) reconstructed with iDose4 alone were visually graded in ViewDEX v2.0 by four radiologists using modified EU image criteria. The visual grading characteristics analysis for the evaluation comparing iDose4 standard dose with IMR low dose did not show any statistically significant difference in five of six criteria. In one of the criteria, iDose4 was superior to IMR. The result show promising possibilities are introduced for substantial radiation dose reduction (35%) in abdominal CT imaging when replacing iDose4 with IMR. Still, care should be taken when considering the reproduction of adrenal glands.

中文翻译:

两种不同剂量水平下腹部计算机断层扫描成像中基于模型的迭代重建的评估

本研究的目的是对最近引入的基于模型的迭代重建方法 (IMR) 进行定性评估,并常规使用迭代重建算法 iDose4 来研究未来腹部 CT 检查剂量减少的可能性。该研究包含来自瑞典隆德斯科讷大学医院接受腹部 CT 的 34 名患者的数据。四位放射科医生使用修改后的欧盟图像标准在 ViewDEX v2.0 中对使用 iDose4 和 IMR 重建的低剂量扫描 (CTDIvol3.4 mGy) 和仅使用 iDose4 重建的标准剂量扫描 (CTDIvol 5.3 mG) 进行视觉分级。用于比较 iDose4 标准剂量与 IMR 低剂量的评估的视觉分级特征分析在六个标准中的五个标准中没有显示任何统计学上的显着差异。在其中一项标准中,iDose4 优于 IMR。结果表明,当用 IMR 代替 iDose4 时,在腹部 CT 成像中显着降低辐射剂量(35%)的可能性很大。尽管如此,在考虑肾上腺的繁殖时仍应小心。
更新日期:2021-01-14
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