Journal article
Monte Carlo simulation of inverse geometry x-ray fluoroscopy using a modified MC-GPU framework
Proceedings of SPIE, the international society for optical engineering, Vol.9412, pp.94120S-94120S-12
02/21/2015
DOI: 10.1117/12.2081684
PMCID: PMC4476537
PMID: 26113765
Abstract
Scanning-Beam Digital X-ray (SBDX) is a technology for low-dose fluoroscopy that employs inverse geometry x-ray beam scanning. To assist with rapid modeling of inverse geometry x-ray systems, we have developed a Monte Carlo (MC) simulation tool based on the MC-GPU framework. MC-GPU version 1.3 was modified to implement a 2D array of focal spot positions on a plane, with individually adjustable x-ray outputs, each producing a narrow x-ray beam directed toward a stationary photon-counting detector array. Geometric accuracy and blurring behavior in tomosynthesis reconstructions were evaluated from simulated images of a 3D arrangement of spheres. The artifact spread function from simulation agreed with experiment to within 1.6% (rRMSD). Detected x-ray scatter fraction was simulated for two SBDX detector geometries and compared to experiments. For the current SBDX prototype (10.6 cm wide by 5.3 cm tall detector), x-ray scatter fraction measured 2.8–6.4% (18.6–31.5 cm acrylic, 100 kV), versus 2.1–4.5% in MC simulation. Experimental trends in scatter versus detector size and phantom thickness were observed in simulation. For dose evaluation, an anthropomorphic phantom was imaged using regular and regional adaptive exposure (RAE) scanning. The reduction in kerma-area-product resulting from RAE scanning was 45% in radiochromic film measurements, versus 46% in simulation. The integral kerma calculated from TLD measurement points within the phantom was 57% lower when using RAE, versus 61% lower in simulation. This MC tool may be used to estimate tomographic blur, detected scatter, and dose distributions when developing inverse geometry x-ray systems.
Details
- Title: Subtitle
- Monte Carlo simulation of inverse geometry x-ray fluoroscopy using a modified MC-GPU framework
- Creators
- David A. P. Dunkerley - Dept. of Medical Physics, University of Wisconsin, Madison, WI, USA Dept. of Radiation Oncology, University of Chicago, Chicago, IL, USA Triple Ring Technologies, Inc, Newark, CA, USAMichael T. Tomkowiak - University of Wisconsin–MadisonJordan M. Slagowski - University of Wisconsin–MadisonBradley P. McCabe - University of ChicagoTobias Funk - Triple Ring TechnologiesMichael A. Speidel - University of Wisconsin–Madison
- Resource Type
- Journal article
- Publication Details
- Proceedings of SPIE, the international society for optical engineering, Vol.9412, pp.94120S-94120S-12
- DOI
- 10.1117/12.2081684
- PMID
- 26113765
- PMCID
- PMC4476537
- eISBN
- 1628415029; 9781628415025
- ISSN
- 0277-786X
- eISSN
- 1996-756X
- Language
- English
- Date published
- 02/21/2015
- Academic Unit
- Radiation Oncology
- Record Identifier
- 9984313093502771
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