Projection geometryΒΆ

Plastimatch uses the same internal geometry for the DRR and FDK codes.

The DRR code generates images from a volume, using the following geometry description:

Inputs Units Default Value
SID mm 1630
SAD mm 1000
Angle degrees 0
Target 3d position (mm) 0,0,0
Camera 3d position (mm) Computed from Target, Angle and SAD
CT Zero 3d position (vox) Same as input volume
Panel resolution pixels 1024 x 768
Panel size mm 400 x 300
Window pixels Same as resolution
NRM 3d direction Computed from Target and Camera
VUP 3d direction Hard coded to (0,0,1)
Panel Orientation 3d direction Computed from NRM and VUP