How do I convert distance in mm to pixels in MATLAB functions?

Functions fanbeam, fan2para, para2fan, ifanbeam ask for parameters like "distance from fan-beam vertex to center of rotation", "FanSensorSpacing", "ParallelSensorSpacing" etc.

And these functions ask for pixels, but the DICOM files provide these values in millimeters. I am wondering how do I covert these values from mm to pixels for simulating real-world sinograms?

It would be best if you could give me a simple example. Thank you.

[Omar Ali]

a = convlength([3 10 20],'ft','m')

Answer 1

[HUIDONG XIE]

I found my answer here: http://dicom.nema.org/Dicom/2011/11_03pu.pdf