Mr. Jonathan Troville Profile

KEYWORDS: Signal attenuation, Virtual reality, Cameras, Detection and tracking algorithms, Visualization, Opacity, Algorithm development, Object recognition, Monte Carlo methods, Matrices

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Proceedings Article | 16 March 2020 Paper

Considerations for accurate inclusion of staff member body tracking in a top-down view virtual reality display of a scattered radiation dose map during fluoroscopic interventional procedures

J. Troville, C. Guo, S. Rudin, D. Bednarek

Proceedings Volume 11312, 113123D (2020) https://doi.org/10.1117/12.2548458

KEYWORDS: Cameras, Coded apertures, Calibration, Virtual reality, Distortion, Imaging systems, Time of flight cameras, Displays, Visualization, Safety

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Proceedings Article | 16 March 2020 Paper

Variation of eye-lens dose with variation of the location of the beam isocenter in the head during neuro-interventional fluoroscopic procedures

Chao Guo, Sheng-Hsuan Sun, Jonathan Troville, Stephen Rudin, Daniel Bednarek

Proceedings Volume 11312, 113123E (2020) https://doi.org/10.1117/12.2549047

KEYWORDS: Eye, Head, Monte Carlo methods, Astatine, X-rays, Photons, Optical simulations, Signal attenuation, Fluoroscopy, Eye models

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Proceedings Article | 1 March 2019 Paper

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

Stephen Rudin, Daniel Bednarek, Chao Guo, Jonathan Troville

Proceedings Volume 10948, 109485I (2019) https://doi.org/10.1117/12.2512984

KEYWORDS: Chest, Abdomen, Head, Monte Carlo methods, Eye, Databases, Imaging systems, X-rays

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Proceedings Article | 1 March 2019 Paper

Development of a real-time scattered radiation display for staff dose reduction during fluoroscopic interventional procedures

J. Troville, S. Rudin, D. Bednarek, J. Kilian-Meneghin, C. Guo

Proceedings Volume 10948, 109482H (2019) https://doi.org/10.1117/12.2512821

KEYWORDS: MATLAB, Virtual reality, Visualization, Cameras, Detection and tracking algorithms, Software development, Monte Carlo methods, Human-machine interfaces, Calibration, Video

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Proceedings Article | 1 March 2019 Paper

Evaluation of skin-dose contribution from a new high-definition image receptor mode during neuro-interventional procedures using the Dose Tracking System

J. Troville, S. Rudin, D. Bednarek

Proceedings Volume 10948, 109483N (2019) https://doi.org/10.1117/12.2512692

KEYWORDS: Skin, Sensors, Receptors, Backscatter, Calibration, Head, Polymethylmethacrylate, Visualization, Collimators, Imaging systems

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Proceedings Article | 9 March 2018 Paper

Calculation of forward scatter dose distribution at the skin entrance from the patient table for fluoroscopically guided interventions using a pencil beam convolution kernel

Sarath Vijayan, Zhenyu Xiong, Chao Guo, Stephen Rudin, Daniel Bednarek, Naveed Islam, Jonathan Troville

Proceedings Volume 10573, 1057363 (2018) https://doi.org/10.1117/12.2294920

KEYWORDS: X-rays, Convolution, Skin, Monte Carlo methods, Polymethylmethacrylate, Aluminum, Point spread functions, Attenuators, Calibration

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The forward-scatter dose distribution generated by the patient table during fluoroscopic interventions and its contribution to the skin dose is studied. The forward-scatter dose distribution to skin generated by a water table-equivalent phantom and the patient table are calculated using EGSnrc Monte-Carlo and Gafchromic film as a function of x-ray field size and beam penetrability. Forward scatter point spread function’s (PSFn) were generated with EGSnrc from a 1×1 mm simulated primary pencil beam incident on the water model and patient table. The forward-scatter point spread function normalized to the primary is convolved over the primary-dose distribution to generate scatter-dose distributions. The utility of PSFn to calculate the entrance skin dose distribution using DTS (dose tracking system) software is investigated. The forward-scatter distribution calculations were performed for 2.32 mm, 3.10 mm, 3.84 mm and 4.24 mm Al HVL x-ray beams for 5×5 cm, 9×9 cm, 13.5×13.5 cm sized x-ray fields for water and 3.1 mm Al HVL x-ray beam for 16.5×16.5 cm field for the patient table. The skin dose is determined with DTS by convolution of the scatter dose PSFn’s and with Gafchromic film under PMMA “patient-simulating” blocks for uniform and for shaped x-ray fields. The normalized forward-scatter distribution determined using the convolution method for water table-equivalent phantom agreed with that calculated for the full field using EGSnrc within ±6%. The normalized forwardscatter dose distribution calculated for the patient table for a 16.5×16.5 cm FOV, agreed with that determined using film within ±2.4%. For the homogenous PMMA phantom, the skin dose using DTS was calculated within ±2 % of that measured with the film for both uniform and non-uniform x-ray fields. The convolution method provides improved accuracy over using a single forward-scatter value over the entire field and is a faster alternative to performing full-field Monte-Carlo calculations.

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