convert 16 bit to 32 bit

hi all,

i have image dicom 16 bit. my problem is, 16 bit image can stored pixel value till 32767 only. now i want change it to 32 bit or 64 bit so that the pixel value can stored more than that, and corresponding how much activity radionuclides i used to diagnosed patient.

Anyone knows how to convert that using matlab? or anyway to solve it?

Answer 1

[Daniel Bridges]

I use the following code for my DICOM dose files to be read by MIM Maestro:

MaxUnsignedInteger = 65535; % cf. https://en.wikipedia.org/wiki/65,535#In_computing
blurreddose = MaxUnsignedInteger / max(max(max(blurreddose))) * blurreddose;

blurreddose = uint16(reshape(blurreddose,...
                 [size(blurreddose,1) size(blurreddose,2) 1 size(blurreddose,3)]));

Have you read the documentation for uint16, uint32, uint64 ? These articles may answer or lead you to the answer you need.

[mohd akmal masud]

what is bluereddose? is it bluereddose is variable?

[Stephen23]

"what is bluereddose? is it bluereddose is variable?"

Yes, it is a variable. You can learn basic MATLAB concepts, like how to define a variable, by doing the introductory tutorials (which are highly recommended for all beginners):

https://www.mathworks.com/help/matlab/getting-started-with-matlab.html

Answer 2

[Image Analyst]

If you want you can convert to double, single, or int32 and save images in a .mat file.

dblData = double(data16);
int32Data = int32(data16);

Or convert to uint16 and save in standard PNG format.

data16 = uint16(data16); % Now can go up to 65535 instead of 32767

I'd guess you can save back into dicom with uint16, but I don't use dicom format - I use PNG.

[mohd akmal masud]

If my image name is PET_I1001_PT135.dcm, then i write like this to convert it:

      P=dicomread('PET_I1001_PT135.dcm');
dblData= double(P)
int32Data = int32(P)

is it true?