Which term describes a gap that directs X-rays toward a tumor?

The term that describes a gap which directs X-rays toward a tumor is a beam collimator. A beam collimator is a device used in medical imaging and radiation therapy that narrows the beam of radiation to focus it precisely on the target area, ensuring that X-rays are aligned effectively to treat the tumor while minimizing exposure to surrounding healthy tissues. This focusing capability is crucial in targeting tumors accurately and efficiently, making the treatment more effective and reducing potential side effects.

In medical practice, the correct application of collimation is essential for maximizing the therapeutic effects of radiation while protecting healthy cells, which could otherwise be damaged by scattered radiation. The use of beam collimators helps ensure that the radiation is concentrated where it is needed most, enhancing the precision of the treatment process.