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A Method for Eye Lens Dose Estimation During Fluoroscopically-Guided Neuro-Interventional Procedures
Z Xiong*, J Kilian-Meneghin , S Vijayan , C Guo , S Rudin , D Bednarek , University at Buffalo, Buffalo, NY
Presentations
WE-AB-601-12 (Wednesday, August 2, 2017) 7:30 AM - 9:30 AM Room: 601
Purpose: The aim of this work is to develop a method to estimate the eye lens dose in real-time during fluoroscopically-guided neuro-interventional procedures.
Methods: EGSnrc Monte Carlo software was used to precalculate the dose to the lens of the eye for a series of projection geometries and exposure parameters used in a procedure. These lens dose values were parameterized and given functional relations so that the appropriate value can be selected for each exposure during the procedure. Using the software developed for our skin-dose tracking system (DTS), the parameters of each exposure pulse are obtained in real-time and used to estimate the corresponding lens dose using either a look-up table or functional relation. The cumulative lens dose values are determined during the procedure for each eye. For the present system only a single computational head phantom of an adult male was used. In addition to the real-time estimation of lens dose, a more accurate calculation can be made post-procedure using Monte Carlo software and the log of exposure parameters recorded for the entire procedure by the DTS.
Results: A library of normalized lens dose values was developed in the format of look-up tables and formulas, for different projection geometry and exposure parameters (kVp, filter, beam size, beam angle and beam location relative to the eye lens). The agreement of the real-time estimated lens dose is within 20% compared to that measured by a 0.6 cc ionization-chamber for most single clinically used projection angles, while the agreement of the post-procedure lens dose calculation is better.
Conclusion: Real-time estimation of lens dose provides additional guidance for the neuro-inteventionalist in dose management during a procedure. The method we have developed provides real-time updates of lens dose with reasonable accuracy and expands the dose information that can be provided by the DTS software.
Funding Support, Disclosures, and Conflict of Interest: This research was supported in part by NIH Grant R01EB002873 and Toshiba Medical Systems Corp.
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