Determination of 3D scattered radiation distributions from the Zubal Phantom as a function of LAO/RAO and CRA/CAU gantry angulation

Chao Guo; Jonathan Troville; Stephen Rudin; Daniel R. Bednarek

doi:10.1117/12.2512984

1 March 2019 Determination of 3D scattered radiation distributions from the Zubal Phantom as a function of LAO/RAO and CRA/CAU gantry angulation

Chao Guo, Jonathan Troville, Stephen Rudin, Daniel R. Bednarek

Author Affiliations +

Proceedings Volume 10948, Medical Imaging 2019: Physics of Medical Imaging; 109485I (2019) https://doi.org/10.1117/12.2512984
Event: SPIE Medical Imaging, 2019, San Diego, California, United States

Abstract

The purpose of this study is to investigate how the scattered radiation distribution in the interventional procedure room varies with changes in cranial / caudal (CRA/CAU) and right anterior oblique / left anterior oblique (RAO/LAO) gantry angulation of a C-Arm fluoroscopic system to aid in staff dose management. The primary x-ray beam of a Toshiba Infinix fluoroscopy machine was modeled using EGSnrc (DOSXYZnrc) Monte Carlo code and the scattered radiation distributions were calculated using 5 x 10⁹ photons incident on the Zubal computational phantom. The Zubal phantom is derived from a CT scan of an average adult male and is anthropomorphic with internal organs. The results show that substantial changes in the scatter dose are possible for the interventionalist next to the table with Cranial/Caudal and RAO/LAO angle variations. For frontal projections the largest change with CRA/CAU angle occurs below the table height, increasing by 50% at the position of the interventionalist next to the table for a 30 degree cranial angulation compared to a caudal angulation for a beam directed toward the abdomen. The scattered radiation distribution also is shown to change with different body regions such as the chest and abdomen. A library of 3D scatter dose-rate distributions is being developed to be implemented in a scatter display system for increased staff awareness of dose levels during procedures.

Citation Download Citation

Chao Guo, Jonathan Troville, Stephen Rudin, and Daniel R. Bednarek "Determination of 3D scattered radiation distributions from the Zubal Phantom as a function of LAO/RAO and CRA/CAU gantry angulation", Proc. SPIE 10948, Medical Imaging 2019: Physics of Medical Imaging, 109485I (1 March 2019); https://doi.org/10.1117/12.2512984

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KEYWORDS

Chest

Abdomen

Head

Eye

Monte Carlo methods

Databases

Imaging systems

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