Length Tool and also measurement tools read in pixels when the pixel data not provided

Length Tool and also measurement tools read in pixels when the Pixel Spacing Attribute not provided,
Any solution for that?

this is the XML attributes dump of the pixel spacing attributes:

3
RGB
0
944
1392
8
8
7
0
00

Thanks for using this forum.

This behaviour is by design. Since there is no pixel spacing in the DICOM, pixel lengths are output. However, the image can be calibrated using the calibration tool.

image

I hope this helps.