Methods of projecting an image onto a patient to aid delivery of proton therapy, including capturing a first image of a patients treatment volume, processing the image to generate a treatment volume image corresponding to at least a portion of the treatment volume, generating a scan pattern to deliver a particle beamline to at least a portion of the treatment volume, projecting the treatment volume image and the scan pattern onto the skin of the patient proximate the treatment volume, and delivering the particle beamline to at least a portion of the treatment volume to match dimensions of the treatment volume image and the scan pattern.
