ISO/TR 24422:2022 用于测量特定放射外科治疗装置物理特性的水等效体模的研制

标准编号：ISO/TR 24422:2022

中文名称：用于测量特定放射外科治疗装置物理特性的水等效体模的研制

英文名称：Development of a water equivalent phantom to measure the physical characteristics of specific radiosurgery treatment devices

发布日期：2022-12

标准范围

水模用于确保准确测量由放射治疗机递送的吸收剂量以及标准化由放射治疗设备产生的剂量分布。本文件描述了聚苯乙烯体模的构造和校准的详细程序及其在测量放射外科医疗器械机械中心周围的吸收剂量分布、野的半高宽（FWHM）和机械中心的物理半影以及相关的不确定性中的使用结果。根据IAEA TRS-483文件，伽玛刀中推荐的最常见设计？系统是一个位于充水或紧凑型聚苯乙烯圆柱体顶部的半球，当使用聚苯乙烯体模时，水吸收剂量的测量深度报告为半径为8？厘米。本文件主要描述测量伽玛刀机械中心周围吸收剂量分布的程序？并从中获得半高宽和半影。根据IAEA TRS-483中建议的设计，开发的模型由聚苯乙烯制成，具有半球形形状。这种类型的体模是特定的，只适用于伽玛刀？放射外科设施（PerfexionTM和IconTM型号），不适用于使用小辐射场治疗疾病（如直线加速器或射波刀）的放射治疗设施中的一般剂量测定方案。考虑到医疗器械的类型对应于在小静态场后使用外部射束放射治疗的治疗，本技术报告遵循IAEA？TRS？483.

A water phantom is used to ensure the accurate measurement of absorbed dose delivered by a radiation therapy machine as well as standardizing the dose distribution produced by the radiation therapy device.

This document describes a detailed procedure for the construction and calibration of a polystyrene phantom and the results of its use in measuring the absorbed dose profile around the mechanical centre of a radiosurgery medical device, the full width at half maximum (FWHM) of the field and the physical penumbra at the mechanical centre, as well as the associated uncertainties.

According to IAEA TRS-483 document, the most common design recommended in Gamma Knife^？ system is a hemisphere atop a water filled or compact polystyrene cylinder, and when using a polystyrene phantom, the measurement depth of the absorbed dose to water is reported to be the centre of the hemisphere with the radius of 8 cm.

This document mainly describes the procedure for measuring the absorbed dose distribution around the mechanical centre of Gamma Knife^？ and obtaining the FWHM and penumbra from it. The developed phantom is made of polystyrene and has a hemispherical shape in accordance with the design suggested in IAEA TRS-483.

This type of phantom is specific and adapted only for the Gamma Knife^？ radiosurgery facilities (Perfexion^TM and Icon^TM models) and does not apply to general dosimetry protocols in radiotherapy facilities that use a small radiation field to treat a disease such as LINAC or Cyberknife.

Considering that the type of medical device corresponds to treatment using external beam radiotherapy following small static fields, this technical report follows the recommendations published in the IAEA TRS？483.

标准预览图