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Sensors 2016, 16(4), 534; doi:10.3390/s16040534

A Simulation Study of a Radiofrequency Localization System for Tracking Patient Motion in Radiotherapy

1
Radiation Oncology, Medical Physics Graduate Program, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA
2
Department of Mechanical and Nuclear Engineering, School of Engineering, Virginia Commonwealth University, Richmond, VA 23284, USA
3
Center for Rehabilitation Science and Engineering, School of Medicine, Virginia Commonwealth University, Richmond, VA 23298, USA
*
Author to whom correspondence should be addressed.
Academic Editors: Changzhi Li, Roberto Gómez-García and José-María Muñoz-Ferreras
Received: 10 February 2016 / Revised: 11 April 2016 / Accepted: 11 April 2016 / Published: 13 April 2016
(This article belongs to the Special Issue Non-Contact Sensing)
View Full-Text   |   Download PDF [2945 KB, uploaded 13 April 2016]   |  

Abstract

One of the most widely used tools in cancer treatment is external beam radiotherapy. However, the major risk involved in radiotherapy is excess radiation dose to healthy tissue, exacerbated by patient motion. Here, we present a simulation study of a potential radiofrequency (RF) localization system designed to track intrafraction motion (target motion during the radiation treatment). This system includes skin-wearable RF beacons and an external tracking system. We develop an analytical model for direction of arrival measurement with radio frequencies (GHz range) for use in a localization estimate. We use a Monte Carlo simulation to investigate the relationship between a localization estimate and angular resolution of sensors (signal receivers) in a simulated room. The results indicate that the external sensor needs an angular resolution of about 0.03 degrees to achieve millimeter-level localization accuracy in a treatment room. This fundamental study of a novel RF localization system offers the groundwork to design a radiotherapy-compatible patient positioning system for active motion compensation. View Full-Text
Keywords: radiotherapy; localization; direction of arrival; angulation; Monte Carlo simulation; intrafraction motion radiotherapy; localization; direction of arrival; angulation; Monte Carlo simulation; intrafraction motion
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Ostyn, M.; Kim, S.; Yeo, W.-H. A Simulation Study of a Radiofrequency Localization System for Tracking Patient Motion in Radiotherapy. Sensors 2016, 16, 534.

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