i have breast cancer dicom file i read it and displayed it now i want to do segmentation for the tumor just the code of segmentation

the code of read and display

if true

dicomlist = dir(fullfile('C:\Users\Zabra\Desktop\breast cancer’,'*.dcm'));

for cnt = 1 : numel(dicomlist)

I{cnt} = dicomread(fullfile('C:\Users\Zabra\Desktop\breast cancer’,dicomlist(cnt).name));

imshow(I{cnt},'DisplayRange',[]);

pause(3)

end

end