Notes on tags of UIH 3D DICOM in MATLAB
In MATLAB, the processing of DICOM files is taken care of by the Image Processing Toolbox. However, as far as I know, this toolbox does not support metadata indexing via numerical tags. In 3D DICOM by developers of United Imaging uEXPLORER, due to the hierarchy structure, indexing through tag names is very inconvenient.
Here, I am keeping a list of the relationship between the 2D DICOM tag and the corresponding 3D DICOM tag. I hope it will help people working with 3D DICOM files on MATLAB.
Basic
- Rescale Slope
Item | Value |
---|---|
Tag | 0028, 1053 |
2D DCM | RescaleSlope |
3D DCM | SharedFunctionalGroupsSequence.Item_1.PixelValueTransformationSequence.Item_1.RescaleSlope |
Radionuclide properties
- Radiopharmaceutical half life
Item | Value |
---|---|
Tag | 0018, 1075 |
2D DCM | RadiopharmaceuticalInformationSequence.Item_1.RadionuclideHalfLife |
3D DCM | RadiopharmaceuticalInformationSequence.Item_1.RadionuclideHalfLife |
- Radionuclide total dose
The injection dose at the Radiopharmaceutical Start Time
Item | Value |
---|---|
Tag | 0018, 1074 |
2D DCM | RadiopharmaceuticalInformationSequence.Item_1.RadionuclideTotalDose |
3D DCM | RadiopharmaceuticalInformationSequence.Item_1.RadionuclideTotalDose |
- Radiopharmaceutical start time
Item | Value |
---|---|
Tag | 0018, 1072 |
2D DCM | RadiopharmaceuticalInformationSequence.Item_1.RadiopharmaceuticalStartTime |
3D DCM | RadiopharmaceuticalInformationSequence.Item_1.RadiopharmaceuticalStartTime |
Decay correction
- Decay correction
The time point of decay correction (“NO”, “START”, “ADMIN”)
Item | Value |
---|---|
Tag | 0054, 1102 |
2D DCM | DecayCorrection |
3D DCM | PerFrameFunctionalGroupsSequence.Item_1.PETFrameCorrectionFactorsSequence.Item_1.DecayCorrection |
More about 3D DICOM
2D DCM or 3D DCM?
I use this syntax to determine whether the dcm file read is 2D or 3D.
info = dicominfo("dicomfile.dcm")
try info.SliceLocation;
disp("Reading 2D DICOM files.")
catch
disp("Reading 3D DICOM files.")
end
PerFrameFunctionalGroupsSequence
The PerFrameFunctionalGroupsSequence
is a collection of individual metadata which would otherwise be in each slice (2D DICOM file). It has multiple Item
s, and the i
‘th slice is represented in PerFrameFunctionalGroupsSequence.Item_i
.