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RadiAnt DICOM Viewer - Discussion Forum
Pixels to mm conversion and (0018,1164) DICOM tag

Jul 13, 2023 03:03 PM
by jackyt
Hello all,
I have a question regarding calculating the dimensions of an angiogram detector in [mm].
I know that the image is 1024 px x 1024 px. In MicroDicom viewer, it states (see attachment) at the bottom of the window 1024 px x 1024 px (115 mm x 115 mm).
The DICOM tag "(0018,1164) Imager Pixel Spacing" for this image is 0.154\0.154. This is why is was working with a detector size of (1024 * 0.154 = 157.7) 157.7 mm x 157.7 mm before this. I am wondering which one is correct, or what I am missing here.

Many thanks in advance!
Jul 13, 2023 03:05 PM
by jackyt
I meant in the Radiant viewer*, also line measurements of the total image give 115[mm] as well.

Oct 20, 2023 08:35 AM
by RadiAnt
It's hard to tell without looking at other DICOM tags. This might be cause by the magnification factor which affects measurements.
Please check the "Calibration of measurements" section:
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