Three-dimensional treatment planning and conformal radiation dose delivery.

Three-dimensional treatment planning and conformal dose delivery have the potential to increase the effectiveness of radiation treatments. For the first time, it is possible to ensure that the intended target is being treated with the full, desired dose. By restricting the high dose region to conform more closely to the shape of the target, normal tissues receive a smaller percentage of the dose, allowing doses to be escalated to the target. New equipment, including multileaf collimators and computer-controlled treatment machines, along with faster and more sophisticated planning systems, are making 3-D planning and treatment delivery increasingly practical. The final impact of these new techniques on the ultimate outcome of a course of radiation will be ascertained through continuing clinical experience and through ongoing clinical trials.