Monte Carlo simulation of a prototypical patient dosimetry system for fluoroscopic procedures
The purpose of this study is to investigate feasibility of a novel real-time dosimetry method for fluoroscopically guided interventions utilizing thin-film detector arrays in several potential locations with respect to the patient and x-ray equipment. We employed Monte Carlo (MC) simulation to estab...
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| Main Author: | |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
17 July 2015
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| In: |
Physics in medicine and biology
Year: 2015, Volume: 60, Issue: 15 |
| ISSN: | 1361-6560 |
| DOI: | 10.1088/0031-9155/60/15/5891 |
| Online Access: | Verlag, Volltext: http://dx.doi.org/10.1088/0031-9155/60/15/5891 Verlag, Volltext: http://stacks.iop.org/0031-9155/60/i=15/a=5891 
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| Author Notes: | Lukas Goertz, Panagiotis Tsiamas, Andrew Karellas, Erno Sajo and Piotr Zygmanski |
| Summary: | The purpose of this study is to investigate feasibility of a novel real-time dosimetry method for fluoroscopically guided interventions utilizing thin-film detector arrays in several potential locations with respect to the patient and x-ray equipment. We employed Monte Carlo (MC) simulation to establish the fluoroscopic beam model to determine dosimetric quantities directly from measured doses in thin-film detector arrays at three positions: A—attached to the x-ray source, B—on the couch under the patient and C—attached to the fluoroscopic imager. Next, we developed a calibration method to determine skin dose at the entry of the beam (${{D}_{\text{entr}}}$ ) as well as the dose distribution along each ray of the beam in a water-equivalent patient model. We utilized the concept of water-equivalent thickness to determine the dose inside the patient based on doses measured outside of the patient by the thin-film detector array layers: (a) A, (b) B, or (c) B and C. In the process of calibration we determined a correction factor that characterizes the material-specific response of the detector, backscatter factor and attenuation factor for slab water phantoms of various thicknesses. Application of this method to an anthropomorphic phantom showed accuracy of about 1% for ${{D}_{\text{entr}}}$ and up to about 10% for integral dose along the beam path when compared to a direct simulation of dose by MC. |
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| Item Description: | Gesehen am 11.12.2018 |
| Physical Description: | Online Resource |
| ISSN: | 1361-6560 |
| DOI: | 10.1088/0031-9155/60/15/5891 |