Contouring dose with pinpoint, multidimensional accuracy, targeting a tumor without damaging surrounding tissue and destroying a tumor in one radiation session is still a lofty goal in radiation therapy, and rarely attainable. For years, radiation oncologists and physicists have longed for technology to match their need for imaging and radiation delivery methods that hit all of these objectives.

With the development of 3D-CRT, IMRT, stereotactic approaches and other advanced forms of radiation therapy, imaging has become increasingly important in the field of radiation oncology.