如何将DICOM图像保存为JPEG而不会丢失信息

Question

I have a dicom image that when I open it in MATLAB it is like this:

However when I see that via dicomviewer it is like this:

How can I save these dicom images without loosing their information in .jpeg format due to compression process? I want to save the image so that I can retrieve the same information as I get from the respective dicom image. Is it possible?

Answer 1

DICOM image data is typically stored as 16-bit unsigned integers, so you'll want to make sure that your image is stored within a uint16 matrix prior to saving so MATLAB knows to save it as such. Also, for some image formats, MATLAB requires that we explicitly state the bit depth.

% Save as a 16-bit Baseline JPEG with the highest quality
imwrite(uint16(data), 'image.jpg', 'Quality', 100, 'BitDepth', 16);

% Save as a 16-bit Lossless JPEG
imwrite(uint16(data), 'image.jpg', 'Mode', 'lossless', 'BitDepth', 16)

% Save as a 16-bit JPEG 2000 Image
imwrite(uint16(data), 'image.jp2', 'Mode', 'lossless')

If you don't need a JPEG for any particular reason, I would recommend a PNG (lossless).

% Save as 16-bit PNG
imwrite(uint16(data), 'image.png')

See the full list of available 16-bit formats here .

For visualization in MATLAB, you can specify the second input to imshow (or use imagesc ) to automatically scale the displayed gray scale values to the data within the image

imshow(data, [])    % or imagesc(data); axis image;