4D dicom matrix? Why not 3D?
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I converted a mha file to dicom format (and got this file: https://www.dropbox.com/s/i0cr2910ie4k5zy/TumorSimOutput2_T1.dcm ) via a Linux utility program (this one: http://manpages.ubuntu.com/manpages/lucid/man1/gdcm2vtk.1.html ) and visualize it via imshow using threedimensional indexing:
imshow(image_data(:,:,index),'DisplayRange',[]);
when I examine the dimensions of image_data I get:
256 256 1 181
I don't understand the purpose of this dimension of 1 element and why isn't required to specify it via imshow. Is this the gray level intensity? How can I check that?
采纳的回答
Walter Roberson
2013-2-8
Some MATLAB routines recognizes four-dimensional arrays as being arrays of images when the third dimension is 1 (grayscale) or 3 (RGB)
However, when you use
image_data(:,:,index)
on a 4 dimensional array, the result is defined to be the same as if you had specified
image_data(:,:,index,1)
As the final two dimensions are both 1, the result of this would be automatically collapsed in representation to two dimensions.
更多回答（1 个）
ChristianW
2013-2-8
编辑：ChristianW
2013-2-8
"Is this the gray level intensity?" - Yes, color reserved dimensions.
It's mostly not about the gray scale. These values just reference to a color in the colormap.
[X, map] = dicomread('US-PAL-8-10x-echo.dcm');
montage(X, map, 'Size', [2 5]);
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