Mr. Chao Guo Profile

Chao Guo

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Publications (13)

Proceedings Article | 7 April 2023 Poster + Paper

Eye-lens dose reduction using Region of Interest (ROI) attenuators in neuroimaging

Martina Orji, Chao Guo, Zhenyu Xiong, S. Setlur Nagesh, Stephen Rudin, Daniel Bednarek

Proceedings Volume 12463, 124632V (2023) https://doi.org/10.1117/12.2653984

KEYWORDS: Head, Attenuators, Eye, Signal attenuation, Collimation, Neuroimaging, Visualization, Monte Carlo methods, Signal intensity, Image processing

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Proceedings Article | 15 February 2021 Poster + Presentation + Paper

Estimation of patient eye-lens dose during neuro-interventional procedures using a dense neural network (DNN)

J. Collins, S. Sun, C. Guo, A. Podgorsak, S. Rudin, D. Bednarek

Proceedings Volume 11595, 1159543 (2021) https://doi.org/10.1117/12.2580723

KEYWORDS: Data modeling, Eye, Head, Monte Carlo methods, Computer simulations, Neural networks

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Proceedings Article | 16 March 2020 Paper

Evaluation of geometric and exposure parameters used in fluoroscopically-guided neuro-interventional procedures

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

Proceedings Volume 11312, 113123B (2020) https://doi.org/10.1117/12.2549026

KEYWORDS: Data conversion, MATLAB, Imaging systems, Visualization, Fluoroscopy, Digital filtering, Medical research

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Proceedings Article | 16 March 2020 Paper

Methods for object tracking and shadowing in a top-down view virtual reality scattered radiation display system (SDS) for fluoroscopically-guided procedures

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

Proceedings Volume 11312, 113123C (2020) https://doi.org/10.1117/12.2548469

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

Comparison of the patient’s skin dose for flat and curved surfaces as a function of x-ray beam angle of incidence

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

Proceedings Volume 11312, 113123A (2020) https://doi.org/10.1117/12.2549374

KEYWORDS: Skin, X-rays, Copper, Photons, Monte Carlo methods, Backscatter, Absorption, Injuries, Optical simulations, Signal attenuation

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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, Jonathan Troville, Sheng-Hsuan Sun, 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

Chao Guo, Jonathan Troville, Stephen Rudin, Daniel Bednarek

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

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 | 9 March 2018 Paper

Investigation of organ dose variation with adult head size and pediatric age for neuro-interventional projections

Zhenyu Xiong, Sarath Vijayan, Chao Guo, Stephen Rudin, Daniel Bednarek

Proceedings Volume 10573, 105734D (2018) https://doi.org/10.1117/12.2293958

KEYWORDS: Head, Brain, Eye, Monte Carlo methods, X-rays, Spinal cord, Neuroimaging, Bone, Aluminum, 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, Jonathan Troville, Naveed Islam, Stephen Rudin, Daniel Bednarek

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.

Proceedings Article | 9 March 2018 Paper

Evaluation of methods of displaying the real-time scattered radiation distribution during fluoroscopically guided interventions for staff dose reduction

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

Proceedings Volume 10573, 1057366 (2018) https://doi.org/10.1117/12.2294575

KEYWORDS: Cameras, 3D displays, Video, Visualization, Imaging systems, Detection and tracking algorithms, Infrared cameras, 3D modeling

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Proceedings Article | 9 March 2018 Paper

Developing a database of 3D scattered radiation distributions for a C-arm fluoroscope as a function of exposure parameters and phantom

Chao Guo, Zhenyu Xiong, Sarath Vijayan, Stephen Rudin, Daniel Bednarek

Proceedings Volume 10573, 1057360 (2018) https://doi.org/10.1117/12.2293788

KEYWORDS: Monte Carlo methods, Databases, Beam shaping, Scattering, Computer simulations, Medical research, Radiology, Photons, Optical simulations, Skin

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Showing 5 of 13 publications

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