Progress in Medical Physics (한국의학물리학회지:의학물리)

Korean Society of Medical Physics (한국의학물리학회)
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Characteristic Evaluation of Pressure Mapping System for Patient Position Monitoring in Radiation Therapy

  • Kang, Seonghee (Department of Radiation Oncology, Seoul National University Hospital) ;
  • Choi, Chang Heon (Department of Radiation Oncology, Seoul National University Hospital) ;
  • Park, Jong Min (Department of Radiation Oncology, Seoul National University Hospital) ;
  • Chung, Jin-Beom (Department of Radiation Oncology, Seoul National University Bundang Hospital) ;
  • Eom, Keun-Yong (Department of Radiation Oncology, Seoul National University Bundang Hospital) ;
  • Kim, Jung-in (Department of Radiation Oncology, Seoul National University Hospital)
  • Received : 2021.12.01
  • Accepted : 2021.12.15
  • Published : 2021.12.31
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Abstract

Purpose: This study evaluated the features of a pressure mapping system for patient motion monitoring in radiation therapy. Methods: The pressure mapping system includes an MS 9802 force sensing resistor (FSR) sensor with 2,304 force sensing nodes using 48 columns and 48 rows, controller, and control PC (personal computer). Radiation beam attenuation caused by pressure mapping sensor and signal perturbation by 6 and 10 mega voltage (MV) photon beam was evaluated. The maximum relative pressure value (mRPV), average relative pressure value (aRPV), the center of pressure (COP), and area of pressure distribution were obtained with/without radiation using the upper body of an anthropomorphic phantom for 30 minutes with 15 MV. Results: It was confirmed that the differences in attenuation induced by the FSR sensor for 6 and 10 MV photon beams were small. The differences in mRPV, aRPV, area of pressure distribution with/without radiation are about 0.6%, 1.2%, and 0.5%, respectively. The COP values with/without radiation were also similar. Conclusions: The characteristics of a pressure mapping system during radiation treatment were evaluated on the basis of attenuation and signal perturbation using radiation. The pressure distribution measured using the FSR sensor with little attenuation and signal perturbation by the MV photon beam would be helpful for patient motion monitoring.

Keywords

Acknowledgement

This work was supported by the National Research Foundation of Korea (NRF) grant funded by the Korea Government (Ministry of Science and ICT, MSIT) (No. 2020R1C1C100936611) and by SNUH Research Fund (No. 0420210620).

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