How does a smaller field size affect patient radiation dose?

A smaller field size decreases patient radiation dose primarily because it limits the area of tissue exposed to radiation during imaging or therapeutic procedures. By confining the radiation to a smaller region, the patient receives less unnecessary exposure, which not only reduces the overall dose but also minimizes the risk of potential radiation-induced damage to surrounding healthy tissues.

This concept is particularly important in radiology and radiation therapy, where precision is crucial. Smaller field sizes ensure that the area of interest receives adequate radiation while protecting adjacent areas. Additionally, by reducing scatter radiation, which can contribute to an increased dose in larger fields, a smaller field size ultimately enhances the safety and effectiveness of radiation use in medical settings.