Slice thickness information lost when using dicomwrite()

Hi, I have written a bit of code to perform some manipulations on a set of DICOM files whose slice thickness (according to dicominfo) is 1 and then write them using dicomwrite. When I use InfoDcm.Slicethickness=1; in order for the slice thickness to be preserved, it only appears as [] when I apply dicominfo to the output file. Does anyone know how to ensure the slice thickness is unchanged?

Thanks, RH

Answer 1

[Kenneth Eaton]

I think your problem may be the missing capitalization of the "t" in the name SliceThickness. Notice that all the fields in the structure returned by DICOMINFO are in upper camel case

[Roman Hochuli]

I changed the input to InfoDcm.SliceThickness=1; but this remained [] in the output file.

Could you suggest another solution?

Thanks

[Kenneth Eaton]

@Roman: It would be helpful if you could include a code sample in the question showing what you are doing. Without that, it's nearly impossible for us to make specific suggestions about what the problem may be.

[Roman Hochuli]

Sorry - I'll explain my problem: I'm using a program called CTcreate to generate a phantom (file type *.egsphant) to use with a Monte Carlo simulation. This simulation only allows for the phantom to be placed on the z-axis (which in the case of transverse DICOM slices passes perpendicular to the images), so I would like to rotate the phantom 90 degrees about the central axis on matlab. I have done this by using dicomwrite to produce slice in the sagittal plane, however CTcreate does not work properly due to an issue regarding slice thickness and I would therefore like to ensure that slice thickness =1 in the output file. Please see code below:

slice=zeros(512,512);

I=zeros(245,512);

InfoDcm.Modality = 'CT';

InfoDcm.Slicethickness = 1.0;

for i=1:512

for j=245:-1:1

slice=dicomread(['vhm' int2str(j) '.dcm']);

I(246-j,:)=slice(:,i);

end;

dicomwrite(int16(I),['SLICE' int2str(i) '.dcm'],InfoDcm);

end;

Answer 2

[mohd akmal masud]

Hi all,

I want to extract the RescaleSlope value from dicominfo for each slice. But i have 135 slice images. This is my code to extract RescaleSlope. But still failed. I JUST CAN EXTRACT ONE BY ONE ONLY.

P = zeros(256, 256, 135);

for K = 1 : 135

petname = sprintf('PET_I1001_PT%03d.dcm', K);

P(:,:,K) = dicominfo(petname);

end

info=dicominfo(P(:,:,K));

[r,c,slice] = findND (info.RescaleSlope);

Anyone who can help me solve this problem???