Matlab not seeing DICOM tag RescaleIntercept (0028,1052)

I have a DICOM dataset which contains a RescaleIntercept field that I can see in RadiAnt Viewer. However, when I load the header of that file into Matlab using dicominfo, the field is absent. I've double checked that the name aliases to the same tag ID:

[group,element] = dicomlookup('RescaleIntercept')

group = 40

element = 4178

dec2hex(40,4) = 0028

dec2hex(4178) = 1052

But both of these lookups fail:

DCMINFO.RescaleIntercept

Reference to non-existent field 'RescaleIntercept'.

DCMINFO.(dicomlookup('0028','1052'))

Reference to non-existent field 'RescaleIntercept'.

How might I read the tag in reliably?

Thank you,

Bogdan

Answer 1

[Bogdan Dzyubak]

It appears that somehow, the RescaleIntercept and other tags were hidden away in a subcategory. They can be accessed with the command below, though the approach may not generalize well:

DCMINFO.(dicomlookup('2001','9000')).Item_1.(dicomlookup('2001','1068')).Item_1.RescaleIntercept

Answer 2

[yildiz]

I have the same problem and ı did not solve problem with this answer.I'm trying to get the informationnd the RescaleSlope field from dcm extension file with dicominfo in matlab. In this way, I can calculate the hounsfield unit value, but I get the unrecognized field warning in the program. The info struct does not have the RescaleSlope field . The code is below

yourImage = dicomread('00000002.dcm');

info = dicominfo('00000002.dcm');

rSlope = info.RescaleSlope;

for j = 1 : size(yourImage, 1) % This loop multiply each voxel value by the rescale slope

for i = 1 : size(yourImage, 2)

hounsfieldImage(i,j) = yourImage(i,j)*rSlope;

end

end

figure

imshow(hounsfieldImage, 'DisplayRange', []);

Please help me.