Figure 1.

Our image-guided work flow during the treatment of stereotactic body radiation therapy for prostate cancer. Initially, patient positioning is accomplished by orthogonal image pair or stereoscopic X-ray imaging with ExacTrac® and cone-beam computed tomography (CBCT) before treatment beam-on. Repeat orthogonal image pair or stereoscopic X-ray imaging is obtained prior to each beam delivery (each of three remaining half-arcs) to account for intra-fractional motion. Each half-arc is delivered over ~2–3 min.