I have used ITKRayCastInterpolateImageFunction to generate DRR. I have given axial CT slices and rotated to sagittal and it is displaying fine. But i only need the half portion of the sagittal image(either left or right half).How can i select only a particular half part in the sagittal image?Is there any function in ITK or VTK that support this kind of requirement?
That sounds like a job for region of interest filter. It is up to you whether you want to generate DRR of the entire 3D image, and then crop it, or crop the 3D image and then generate DRR.