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Determination of Potential Uterine (Conceptus) Doses From Axial and Helical CT Scans

Dietrich, M F.; Miller, K L.; King, S H.*

doi: 10.1097/01.HP.0000147810.99736.70
A Guide to SI Units in Radiation Protection: Operational Topic

A tissue equivalent Rando Phantom† and thermoluminescent dosimeters (TLDs) (LiF) were used to determine potential doses to the uterus at approximately the position of a conceptus from axial and helical CT scans of that region of the body. Doses were measured at the surface of the phantom and at various locations throughout the phantom. The results indicate that measurements taken on the surface of a patient or phantom are generally higher than the level at the location of the uterus within the patient. The results also indicate that the dose to tissue that is 12.7 cm (5 in) out of the direct beam is less than 10% of the dose within the beam. For tissues that are 20 cm (8 in) out of the beam, the dose is approximately 1% of the dose in the beam.

* Penn State Hershey Medical Center, 500 University Drive, Hershey, PA 17033.

Guidance is presented on radiation to the uterus from CT examinations.

©2005Health Physics Society