计算机断层扫描的尺寸特异性剂量估计值（SSDE）的计算方法

[中文适用范围]： 本文档适用于能够按照 IEC 60601-2-44 标准显示和报告 CTDI VOL 的计算机断层扫描 (CT) 扫描仪，以及用于计算、显示和记录尺寸特定剂量估计值 (SSDE) 及其相关组件的辐射剂量指数监测软件 (RDIMS)。 [外文原描述]： IEC 62985:2019 applies to – CT SCANNERS that are able to display and report CTDIVOL in accordance with IEC 60601-2-44, and – RADIATION dose index monitoring software (RDIMS) for the purpose of calculating, displaying and recording the SIZE SPECIFIC DOSE ESTIMATE (SSDE) and its associated components. Specifically, this document provides standardized methods and requirements for calculating, displaying, or recording of SSDE, SSDE(z), WATER EQUIVALENT DIAMETER (DW), and DW(z), where z represents a specific longitudinal position of the scanned object. This document provides a method of determining a reference WATER EQUIVALENT DIAMETER, DW,REF(z), using CT scans of two cylindrical water PHANTOMS and one or more anthropomorphic PHANTOM(S), which conform to the specifications defined in this document. The method of calculating the WATER EQUIVALENT DIAMETER that is implemented by the MANUFACTURER, DW,IMP(z), is tested and validated against DW,REF(z) using the TEST OBJECTS and methods defined within this document. This document also describes the methods for calculating SSDE and DW, which represent the average values of SSDE(z) and DW(z) over the RECONSTRUCTION LENGTH. The contents of the corrigendum of June 2022 have been included in this copy.