OPTIMIZED MAMMOGRAPHY INSTRUMENT

乳腺X线摄影在早期发现乳腺癌方面起着至关重要的作用。 不幸的是，今天使用的乳房X光检查设备从未被分析过， 从系统的角度来看。 多参数优化研究 Muntz等人已经报道了乳房X线照相系统（MedPhys 12，5， 1985年），其中患者剂量已最小化，同时维持 满意的图像质量。 设计中最重要的新特性 存在一排薄金属叶片， X射线源，在乳房和胶片之间。 叶片吸收 散射的辐射，从而提高图像的质量。 为了 为了使叶片不在胶片上成像，网格必须以精确的角度移动。 在暴露过程中控制轮廓。

Mammography plays a vital part in the early detection of breast cancer. Unfortunately, mammography units being used today have never been analyzed from a systems point of view. Multiparameter optimization studies of a mammography system have been reported by Muntz et al. (Med Phys 12, 5, 1985), in which the patient dose has been minimized while maintaining satisfactory image quality. The most important new feature of the design is the presence of an array of thin metal vanes arranged in an arc about the x-ray source, between the breast and the film. The vanes absorb scattered radiation and thus improve the quality of the image. In order for the vanes not to image on the film, the grid must move in a precisely controlled profile during the exposure.