RAW：指一种数码照片的文件格式，这种数码照片未经压缩，基本上未被相机芯片所修改，因此包含所有的颜色和影像细节。

RAW: A file format for digital photographs that is uncompressed and largely unmodified by the camera's chips, and therefore includes every detail of the color and image.

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在对符合DICOM标准的医学影像文件进行处理的时候，首要的问题是怎样去读取图像文件的信息，所以了解DICOM数据格式与文件格式是极为重要的事情。

These four levels interrelate and interdepend each other. When we deal with medical image which accord with DICOM standard, primary problem is how to get the data of the image file.

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