cast() convert image to struct

Question

Hai Phan 2020-4-23

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/520217-cast-convert-image-to-struct

回答： Raunak Gupta 2020-4-28

Hi,

I have nifti image with size (198 x 208 x 1 x 50), Bytes(8236800), Class(Single). And I wanted to change the class to Int16 using the function cast() here is my code :

V = niftiread('la_2ch.nii.gz'); % Read the nifti image
whos V                          % print size and data type of image
Z=cast(V,'int16');              % Convert the single-precision float data type to UInt16 
                                % because this is one of the compatible format for the 
                                % input of  dicomwrite.
A=dicomwrite(Z,'la_2ch.dcm_Int16');% Writing to Dicom
whos A

And this the the result for A

Name Size Bytes Class Attributes

A 1x1 1508 struct

How do I use cast() and still get the size (198x208x1x50) and class (int16) so I can display 50 frames in DICOM instead of having one single image which I don't know its meaning.

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Answer 1

Raunak Gupta 2020-4-28

0
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https://ww2.mathworks.cn/matlabcentral/answers/520217-cast-convert-image-to-struct#answer_428915

在 MATLAB Online 中打开

Hi,

The A returned after using dicomwrite tell about the metadata that is used to generate the dicom file. As you can see by running

whos V

it returns a (198 x 208 x 1 x 50) int16 matrix which is exactly what is required. Also, by running the dicomwrite command you can see 'la_2ch.dcm_Int16' file created in current working folder. The image that is converted to int16 is Z and not A which is mere metadata file.