What is the primary function of filtration in therapy units?

The primary function of filtration in therapy units is to reduce unnecessary exposure to patients. Filtration removes low-energy photons from the X-ray beam before it reaches the patient. These low-energy photons contribute to radiation dose without providing any diagnostic or therapeutic benefit, as they are unlikely to interact with the target tissues effectively. By filtering out these less useful rays, filtration ensures that the radiation dose delivered is more effective and focused on the tissues requiring treatment, thus minimizing the overall exposure to the patient. This is a crucial method of enhancing patient safety and optimizing the therapeutic benefits of the radiation therapy being administered.