EuroSafe Imaging 2020
Action 7 - Radiation protection of children, Neuroradiology brain, Radiation physics, Radioprotection / Radiation dose, CT, Dosimetry, Physics, Dosimetric comparison, Education and training, Not applicable
K. J. Strauss, S. L. Brady, S. McKenney, D. P. Frush
Description of activity and work performed
In 2019, the use of Dw was expanded to include conversion factors for head CT (Report 293). For this presentation, 620 Head SSDE CFs (i.e., fH16) were calculated based on anteroposterior (AP), lateral (LAT), effective diameter (eff. Dia.), and Dw calculations, [Fig. 1]. The resulting average patient ranges, [Fig. 2] are reported based on patient’s age and weight, and demonstrated fH16 CFs, [Fig. 3] that ranged from 1.2-to-0.8 (newborns-to-adults), [Table 1]. A comparison of head and body CFs, based on the 16-cm diameter CTDI phantom, over the same range of Dw, demonstrates an ~ 9% reduction of absorbed dose to the brain compared to that of the abdomen, [Fig. 4]. The decreased radiation dose to the center of the head, compared to the abdomen for the same Dw, is explained by the increased attenuation of the radiation beam by the cranium.