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Proceedings Paper

Lens of the eye dose calculation for neuro-interventional procedures and CBCT scans of the head
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Paper Abstract

The aim of this work is to develop a method to calculate lens dose for fluoroscopically-guided neuro-interventional procedures and for CBCT scans of the head. EGSnrc Monte Carlo software is used to determine the dose to the lens of the eye for the projection geometry and exposure parameters used in these procedures. This information is provided by a digital CAN bus on the Toshiba Infinix C-Arm system which is saved in a log file by the real-time skin-dose tracking system (DTS) we previously developed. The x-ray beam spectra on this machine were simulated using BEAMnrc. These spectra were compared to those determined by SpekCalc and validated through measured percent-depth-dose (PDD) curves and half-value-layer (HVL) measurements. We simulated CBCT procedures in DOSXYZnrc for a CTDI head phantom and compared the surface dose distribution with that measured with Gafchromic film, and also for an SK150 head phantom and compared the lens dose with that measured with an ionization chamber. Both methods demonstrated good agreement. Organ dose calculated for a simulated neuro-interventional-procedure using DOSXYZnrc with the Zubal CT voxel phantom agreed within 10% with that calculated by PCXMC code for most organs. To calculate the lens dose in a neuro-interventional procedure, we developed a library of normalized lens dose values for different projection angles and kVp’s. The total lens dose is then calculated by summing the values over all beam projections and can be included on the DTS report at the end of the procedure.

Paper Details

Date Published: 22 March 2016
PDF: 15 pages
Proc. SPIE 9783, Medical Imaging 2016: Physics of Medical Imaging, 97832V (22 March 2016); doi: 10.1117/12.2216504
Show Author Affiliations
Zhenyu Xiong, Toshiba Stroke and Vascular Research Ctr. (United States)
Sarath Vijayan, Toshiba Stroke and Vascular Research Ctr. (United States)
Vijay Rana, Toshiba Stroke and Vascular Research Ctr. (United States)
Amit Jain, Toshiba Stroke and Vascular Research Ctr. (United States)
Stephen Rudin, Toshiba Stroke and Vascular Research Ctr. (United States)
Daniel R. Bednarek, Toshiba Stroke and Vascular Research Ctr. (United States)


Published in SPIE Proceedings Vol. 9783:
Medical Imaging 2016: Physics of Medical Imaging
Despina Kontos; Thomas G. Flohr, Editor(s)

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