I want to convert the isocenteric position of real plan that is achieved with the TPS to the isocentric parameter of dosxyznrc code.for this purpose I read my dicom image with ctcreate code and the voxel rang of dicom image is as follow

X range : -20.850000 - 20.249998 cm

Y range : -41.050003 - 0.049995 cm

Z range : -39.849998 - -7.349998 cm

and the position of isocneter that achieved in the TPS is as follow

x=-7.5 cm

y=0.7 cm

z=0.3 cm

the problem is that the voxel rang of dosxyznrc( read by ctcreate code) doesn't match to the isocentric position of real treatment.

if your answer is yes please explain me how I can solve this problem?

please help me

thanks in advance to your attention or maybe your answer