基于DICOM文件信息估算多排螺旋CT剂量方法的探讨

目的 建立基于DICOM文件信息估算X射线CT剂量的方法,并验证该方法的可靠性。方法 以临床常用多排螺旋CT为研究对象,采用java语言开发DICOM图像文件信息读取软件,实现自动化批量读取在不同扫描模式下胸部、腹部X射线CT螺旋扫描的每幅图像中的剂量相关信息,结合准直、mAs、螺距等扫描参数,计算每次扫描检查的容积CT剂量指数(CTDI_vol)和DLP,并与X射线CT的显示值进行比较。结果 对于胸部螺旋扫描,基于DICOM图像文件信息计算得到的CTDI_vol与显示值误差为-2%~8%,DLP与显示值误差为-2%~5%;对于腹部螺旋扫描,CTDI_vol计算值与显示值误差在0~2%,DLP与显示值误差在1%~3%。计算得到的CTDI_vol与显示值误差为-2%~2%,DLP与显示值误差为-2%~3%。 结论 本研究所建立的基于DICOM文件信息估算多排螺旋CT剂量的方法值得推广和应用。

Discussions of Multi-Detector Computed Tomography (MDCT) dose assessment based on information in DICOM images

Objective To establish an accuracy test method for MDCT dose assessment based on information in DICOM images. Methods The type of MDCT studied in this paper was widely used in clinical practice. A software package developed by java language was used to automatically read dose-related information from DICOM files of MDCT. The CTDI_vol and DLP of each pectoral or abdominal scan was calculated based on these information and the basic scan parameters such as collimation, mAs and pitch. The calculated values were compared with the displayed values. Results For pectoral scans, the difference between the calculated and displayed values was between -2%-8% for CTDI_vol, and -2%-5% for DLP. For abdominal scan, the difference between the calculated and displayed values was 0-2% for CTDI_vol, and -2%-3% for DLP. Conclusions This method is useful for MDCT dose assessment and is worth disseminating its application for general use.