重新缩放坡度和重新缩放拦截 [英] rescale slope and rescale intercept
问题描述
我对 CT DICOM 中的重新缩放坡度和重新缩放拦截有疑问：
- 它们是用来将原始数据从扫描仪传输到 Hounsfield 数据集的，其中水为0，空气为-1000 ？
- 我在图像显示组中。我怎么知道重新缩放斜率和重新缩放截距值？
- 重新缩放斜率和重新缩放截距的确切含义是什么？如何确定？
- Are they used to transfer original data from the scanner to Hounsfield data set, in which water is 0 and air is -1000?
- I am in the image display group. How can I know the rescale slope and the rescale intercept values?
- What's the exact meaning of the rescale slope and the rescale intercept? How are they determined?
推荐答案
重新缩放斜率和重新缩放截距可以转换像素值到HU或其他单位，如标签0028,1054中所指定。
The rescale slope and rescale intercept allow to transform the pixel values to HU or other units, as specified in the tag 0028,1054.
对于CT图像，单位应为HU（Hounsfield），并且在以下情况下默认值为HU标签0028,1054不存在。
但是，标签可能存在并且可以指定不同的单位（OD =光学密度，US =未指定）。
For CT images, the unit should be HU (Hounsfield) and the default value is indeed HU when the tag 0028,1054 is not present. However, the tag may be present and may specify a different unit (OD=optical density, US=unspecified).
确定了重新缩放斜率和截距
The rescale slope and intercept are determined by the manufacturer of the hardware.
如果从原始像素值到Hounsfield或光密度的转换不是线性的，则应用LUT。
If the transformation from original pixel values to Hounsfield or Optical density is not linear, then a LUT is applied.
请检查标准C.11的第3部分以获取更多详细信息，以及此答案 DICOM图像的窗口宽度和中心计算
Check the part 3 of the standard C.11 for more detailed information, and also this answer Window width and center calculation of DICOM image
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