Augment CT volume to xray image

Hi every one,
I have a few questions about medical images,
There is an easy way to convert CT volume to x-ray image, I hear about sum up the column of the volume and to project it to 2D.
I try to create a lot of x-ray images from CT scans.
Like data augmentation, manipulate the 3D image, and create new 2D.

If some have experience with such a thing.