1. A method for establishing radiation beam parameters for delivery of radiotherapy treatment to a patient using a radiotherapy treatment device, the method comprising: a. orienting a wand with respect to the patient to establish a beam entry point; b. acquiring positional parameters characterizing wand positioning with respect to a room coordinate system; c. defining, in the room coordinate system, a beam angle consistent with the beam entry point; d. obtaining one or more images of the patient's internal anatomy; and e. visually representing portions of the patient's internal anatomy within a beam area corresponding to the defined beam angle, wherein the visual representations of the patient's internal anatomy comprises digitized images of one or more internal anatomical features of the patient's anatomy according to a beam's eye view of a radiation treatment device, wherein the beam's eye view is oriented along the defined beam angle.