What is the primary objective when utilizing collimators in radiation therapy?

The primary objective when utilizing collimators in radiation therapy is to minimize tissue dose outside the treatment area. Collimators are devices that shape and direct the radiation beam to ensure it conforms to the target tumor while avoiding surrounding healthy tissues. By precisely controlling the geometry of the radiation beam, collimators help to limit unnecessary exposure to adjacent organs and tissues, thus reducing the risk of radiation-induced side effects. This precision is essential for maximizing the efficacy of the treatment while protecting normal anatomy, making it a central aspect of radiation treatment planning.

The remaining options do not align with the fundamental purpose of collimators. For instance, maximizing patient exposure and increasing scatter radiation would contravene safety protocols aimed at protecting patients. Similarly, while reducing treatment time may be a consideration in some contexts, it is not the primary function of collimators, which is focused on ensuring targeted delivery of radiation.