成像体模
扫描仪
软件
质量保证
计算机科学
自动曝光控制
工作流程
图像质量
生物医学工程
核医学
计算机视觉
人工智能
医学
图像(数学)
病理
数据库
程序设计语言
外部质量评估
作者
S. Sauranen,Teemu Mäkelä,Touko Kaasalainen,Mika Kortesniemi
标识
DOI:10.1016/j.ejmp.2024.103211
摘要
Purpose A quality control (QC) system for dual-energy CT (DECT) was developed. The scope of the QC system was to monitor both the constancy of the CT images and the software used in calculating the DECT derived maps. Longitudinal analysis was based on a standard imaging protocol, a commercial multi-energy phantom, and a semi-automatic analysis tool. Methods The phantom consisted of an elliptical body section with round slots for interchangeable inserts. It was scanned with 90kVp/Sn150kVp, automatic tube current modulation, and 9.6 mGy CTDIvol. From the two conventional CT images, scanner manufacturer’s software was used to provide virtual monoenergetic images at two different energies, effective atomic number (Zeff) maps, and iodine concentration maps. The images were analyzed using an open-source tool allowing user-selected statistics of interest. The means and standard deviations of the phantom background and the iodine, calcium, and water inserts were recorded. The QC tool is available at github.com/tomakela/dectqatool. Results The obtained results were generally highly consistent over time, except for the smaller diameter iodine inserts. A small change in Zeff was observed after a DECT software update. The developed QC tool aided the analysis robustness: the segmentations were modifiable when needed, and small rotations or air bubbles in the water insert were easily corrected. Conclusion The developed QC system provided easy-to-use workflow for constancy measurements. A small deviation due to change in the post-processing was detected. The proposed imaging protocol and analysis steps, and the reported measurement variations can aid in determining action levels for DECT QC.
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