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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.
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Zhenyu Xiong, Sarath Vijayan, Vijay Rana, Amit Jain, Stephen Rudin, Daniel R. Bednarek, "Lens of the eye dose calculation for neuro-interventional procedures and CBCT scans of the head," Proc. SPIE 9783, Medical Imaging 2016: Physics of Medical Imaging, 97832V (22 March 2016); https://doi.org/10.1117/12.2216504