Convert DICOM video (4D) to 3D matrix

I have a DICOM ultrasound video, when I save it as a .mat file I find that it is a unit8 file with a 4D matrix. I thought the output would be a 3D matrix

When I save an individual frame and save as a .mat file I get a 2D matrix (Depth and Lateral). Which is to be expected. I am assuming the 4th dimension is an extra colour dimension that isn't needed (these are greyscale images).

What I want is to get the video and save it as a 3D matrix. Depth, Lateral and Frame number. Any help would be greatly appreciated.

Answer 1

[Rik]

If it saves your data as an RGB image, one of the dimensions will be 3. You can find the size of your matrix with the size function.

%suppose D contains your data
disp(size(D))
%suppose the result is 255 255 3 40
D=squeeze(D(:,:,1,:));
% or:
D=mean(D,3,'native');
% or even:
D=mean(D,find(size(D)==3,1),'native');

[James Blackwell]

Perfect, thanks so much!