2021 Undergraduate Research Showcase

Document Type

Student Presentation

Presentation Date


Faculty Sponsor

Natalie Mourant


The objective of this experiment was to determine whether various collimation sizes affect patient dose and scatter radiation. This experiment was carried out in a radiology lab at a university located in the pacific northwest of the United States. An abdomen phantom was positioned in an anteroposterior (AP) position to simulate an examination of the lumbar spine. Various collimated field sizes were used to represent both tight and loose collimation. The entrance skin exposure (ESE) and scatter radiation were measured with an ionization chamber at each collimated field size. The null hypothesis stated that collimation will have no effect on patient dose or scatter radiation. The findings of this research showed a correlation between collimated field size and patient dose, as well as collimated field size and scatter radiation. Potential limitations of this experiment were time constraints, equipment quality and possible human error. The authors suggest more research be obtained comparing the amount of radiation dose patients are subjected to due to repeating exposures versus the amount of radiation dose from insufficient collimation.



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