4d cone beam ct using deformable registration

A computer product having a non-transitory medium storing a set of instructions, an execution of which causes a process to be performed, the process comprising:

• obtaining a plurality of volumetric images, the volumetric images generated using respective sets of projection images, wherein the volumetric images and the respective sets of projection images correspond with different respective bins for a physiological cycle;
• and
• determining an additional volumetric image using one or more of the projection images from each of the sets that correspond with the different respective bins for the physiological cycle.

An apparatus for obtaining a volumetric image, comprising a processor, wherein the processor is configured for:

• obtaining a plurality of volumetric images, the volumetric images generated using respective sets of projection images, wherein the volumetric images and the respective sets of projection images correspond with different respective bins for a physiological cycle;
• and
• determining an additional volumetric image using one or more of the projection images from each of the sets that correspond with the different respective bins for the physiological cycle.