Dicomread images with different x and y sizes into a cellarray.

Hi. This may be easy for some Matlab users. I am trying to dicomread and process images starting my code with the following commands:

[Filename1,Pathname1]=uigetfile('Multiselect','on');
for i=1:length(Filename1)
    images(:,:,i)=dicomread(fullfile(Pathname1,Filename1{i}));
    images=double(images);
end

However, my images appear to change size therefore I get the error: 'Subscripted assignment dimension mismatch.'

Any ideas how I could dicomread and place in order all dicom images independently of their size, would be much appreciated.

Thank you

Answer 1

[Guillaume]

You've answered your question in its title. Use a cell array:

[Filename1,Pathname1]=uigetfile('Multiselect','on');
images = cell(size(Filename1));
for fileidx = 1:numel(Filename1)
  images{fileidx} = double(dicomread(fullfile(Pathname1,Filename1{i})));
end

[GioPapas81]

Thank you Guillaume. I get an error though:

Error using dicom_getFileDetails (line 14) File "Y:\..\IM-0070-0001.dcm" not found.

Error in dicomread>newDicomread (line 188) fileDetails = dicom_getFileDetails(filename);

Error in dicomread (line 86) [X, map, alpha, overlays] = newDicomread(msgname, frames, useVRHeuristic);

In fact, I am interested to ideally save if possible all images (independently of their size) in images(:,:,i) format. If that's not possible, I would be interested to at least save in images(:,:,i) format all images with size let's say 192 x 154.

[Guillaume]

I've not changed the way you read the files. It's a bit puzzling why the file would not be found since it's been selected with uigetfile but that's a completely different issue to your question.

Using a cell array, it will read all images. But the output is obviously not a 3D matrix. it is not clear to me whether your requirement to store the images as images(:, :, i), that is a 3D matrix, is one of lack of familiarity with matlab or truly a necessity. Why do you need the images as a 3D matrix? Isn't the cell array good for you?

If you do need a 3D matrix, then yes, you'll either have to drop the images that don't match your required size, or rescale them.

[Image Analyst]

I'm not even sure that you NEED to have all the images in memory simultaneously. Why do you think you do? Usually it's not necessary. Just process each image one at a time in the loop and don't store them all.

[GioPapas81]

I re-sorted my files, tried again and it worked (I am not sure why I got this error in first place).

I think that I have mis-used the term 'cellarray', instead of using 3D matrix initially but your are right, I can replace the 3D matrix with a cellarray. I only need to incorporate changes in a relatively long code, but there is no free lunch in life.

Thank you again both.