改变源片距离和曝光剂量，进一步突出所能发现的误差，确定最佳曝光条件；
Then, exposure conditions including the exposure dose and source to film distance were changed to find the optimal one.
方法：选择三组不同曝光条件照射、制定标准测试点通过仪器对影像密度测试，并与普通屏—片进行对照、综合评价。
Method: Three different exposure conditions were used and the density of CT radiographs obtained was measured and compared with traditional screen film image.
以及改变单元，用于根据与所选择的显示模式相对应的阈值以及所述差的值，改变用于获取所述实时取景图像的曝光条件。
The image capturing apparatus allows for control of the exposure conditions for acquiring the live view images in accordance with the selected live view display mode.
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