MATLAB: Aren’t all of the tags showing up in the ‘info’ structure from DICOMINFO in the Image Processing Toolbox 8.0

dicomImage Processing Toolboxr2012a

I have a DICOM file with many tags that are not showing up in the output from DICOMINFO. These tags are in the DICOM Dictionary and show up in ImageJ.
What can I do?

Best Answer

The tags being looked for are buried within the Items of Sequence fields that have come before them. Here are a few lines from a sample DICOM file:
 0002306    2  (0018,9325) SQ         62 bytes - CTXrayDetailsSequence            
 0002318    3  (FFFE,E000) UN         54 bytes - Item                             
 0002326    4  (0018,0060) DS          2 bytes - KVP                              [80]
 0002336    4  (0018,1160) SH          6 bytes - FilterType                       [SMALL ]
 0002350    4  (0018,1190) DS          8 bytes - FocalSpot                        [0.9\0.8 ]
 0002366    4  (0018,7050) CS          6 bytes - FilterMaterial                   [COPPER]
 0002380    2  (0018,9329) SQ         84 bytes - CTImageFrameTypeSequence         
 0002392    3  (FFFE,E000) UN         76 bytes - Item                             
 0002400    4  (0008,9007) CS         24 bytes - FrameType                        [ORIGINAL\PRIMARY\VOLUME ]
 0002432    4  (0008,9205) CS         10 bytes - PixelPresentation                [MONOCHROME]
 0002450    4  (0008,9206) CS          6 bytes - VolumetricProperties             [VOLUME]
 0002464    4  (0008,9207) CS          4 bytes - VolumeBasedCalculationTechnique  [NONE]
Thus KVP, FilterType, FocalSpot and FilterMaterial will all show up in the CTXrayDetailsSequence which is in Item_1 of SharedFunctionalGroupSequence. Since these are all structs, they can be referenced with dot notation. To extract KVP from above:
info = dicominfo('sample.dcm');
info.SharedFunctionalGroupsSequence.Item_1.CTXrayDetailsSequence.Item_1.KVP
Related Question