摄影 医用放射照相用屏蔽/胶片系统 第3部分:胸部透视用感光曲线形状、速度和平均梯度的测定

[中文适用范围]： ISO 9236 的这一部分规定了乳腺 X 线摄影中屏幕/胶片/胶片支架/处理系统的单个样本的感光曲线形状、平均梯度和速度的确定方法。 胶片固定器可以是确保屏幕/胶片紧密接触并防止胶片暴露于环境光的任何装置。 特别地，胶片支架可以是实验室中经常使用的不透光真空袋，或者是乳房X线照相术中使用的射线照相暗盒。 注：此后，屏幕/胶片/胶片支架组合将被称为“组合”，并且当包括处理时将被称为“系统”。 [外文原描述]： This part of ISO 9236 specifies methods for determination of the sensitometric curve shape, average gradient and speed of a single sample of a screen/film/filmholder/processing system in mammography. The filmholder may be any means which ensures close screen/film contact and prevents the film from being exposed to ambient light. In particular, the filmholder may be a light-tight vacuum bag, as often used in the laboratory, or a radiographic cassette as used in mammography. NOTE — Hereafter, screen/film/filmholder combinations will be referred to as "combinations", and will be referred to as "systems" when the processing is included.