3-D conformal radiation therapy is a method of treating patients who have tumors that are too close to vital organs and other structures for normal radiation therapy.  It involves a complex process of creating individualized, 3D digital data sets of a patient's tumors and normal adjacent anatomy. These data sets are then used to generate 3D computer images that help in the delivery of highly focused radiation beams that maximize the radiation of tumors while minimizing damage to normal tissue in adjacent organs.