2020 Undergraduate Research Showcase


How Collimation Affects Patient Radiation Dose

Document Type

Student Presentation

Presentation Date


Faculty Sponsor

Natalie Mourant


The objective of this study is to explore the relationship that collimation has on patient radiation exposure. The study tested radiation exposure in three different common x-ray exams: PA chest, AP lumbar spine, and PA hand. The experiment was conducted in a controlled environment utilizing an ionization chamber to measure simulated patient radiation exposure. The technical factors used were consistent for each phantom, but the collimation was changed with each projection to test the difference in dose. Two exposures were taken for each phantom, with collimation opened up to the entire 14 inches by 17 inches plate for the first, and the second exposure collimated with a 1-inch border around the anatomy. The study indicated a directly proportional trend in the relationship between field size and patient dose.

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