The effect of underlying bone on the beam angular correction in calculating the skin dose of the head in neuro-interventional imaging

Sheng-Hsuan Sun; Stephen Rudin; Daniel R. Bednarek

doi:10.1117/12.2580992

15 February 2021 The effect of underlying bone on the beam angular correction in calculating the skin dose of the head in neuro-interventional imaging

Sheng-Hsuan Sun, Stephen Rudin, Daniel R. Bednarek

Author Affiliations +

Proceedings Volume 11595, Medical Imaging 2021: Physics of Medical Imaging; 1159523 (2021) https://doi.org/10.1117/12.2580992
Event: SPIE Medical Imaging, 2021, Online Only

Abstract

EGSnrc Monte-Carlo software was used to calculate the “patient’s skin dose” as a function of incident beam angle for cylindrical water phantoms with underlying subcutaneous fat and various thicknesses of bone. Simulations were done for incident angles from 90 to 10 degrees, entrance beam sizes from 5 to 15 cm, and energies from 60 to 120 kVp. The depth-averaged scatter-plus-primary to incident-primary dose ratio decreases with decreasing skin incident angle and increasing underlying bone thickness, and increases with increasing field size and energy. Corrections for these factors improve the accuracy of skin-dose estimation for neuro-interventional procedures with our Dose-Tracking-System.

Conference Presentation

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Sheng-Hsuan Sun, Stephen Rudin, and Daniel R. Bednarek "The effect of underlying bone on the beam angular correction in calculating the skin dose of the head in neuro-interventional imaging", Proc. SPIE 11595, Medical Imaging 2021: Physics of Medical Imaging, 1159523 (15 February 2021); https://doi.org/10.1117/12.2580992

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