Modality LUT / DICOM Part 14

[Dik]

Hi all,

DICOMScope seems to be compatible with DICOM Part 14.

As we are digitizing X-ray films we want the digitized images to look similar on screen as film on the light-box.

Could anyone comment on what DICOM tags are used by DICOMscope to ensure proper display of scanned images.

Is this Rescale Slope/Intercept/Type??

Thanks,

Dik

[Marco Eichelberg]

DICOMscope indeed is "compatible" with DICOM Part 14 in the sense that it allows a display to be calibrated against the GSDF and it also supports Presentation States including a faithful rendering of the DICOM grayscale display pipeline.

If you want your scanned images to be displayed correctly, you need to make sure that DICOMscope (or any other DICOM viewer) correctly interprets the grayscale value space. The most interoperable way of doing this (but I have never seen a film scanner that is actually able to do it correctly) is to encode the scanned film as P-values (see DICOM part 14 for details). Alternatively you could store optical density (i.e., thousands of OD). In this case you will need to encode a Presentation State containing a Presentation LUT that describes the mapping from OD to P-values.

[Dik]

P-Values seems to be used in Softcopy Presentation LUT, which is not a module defined for Secondary Capture. Secondary Capture is the IOD used for digitizers. If this is correct, does it make sense to include a presentation LUT??