A noble technique a using force-sensing resistor for immobilization-device quality assurance: A feasibility study

Min Seok Cho, Tae Ho Kim, Seong Hee Kang, Dong Su Kim, Kyeong Hyeon Kim, Dong Seok Shin, Yu Yun Noh, Hyun Jae Koo, Geum Seong Cheon, Tae Suk Suh, Siyong Kim

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Abstract

Many studies have reported that a patient can move even when an immobilization device is used. Researchers have developed an immobilization-device quality-assurance (QA) system that evaluates the validity of immobilization devices. The QA system consists of force-sensing-resistor (FSR) sensor units, an electric circuit, a signal conditioning device, and a control personal computer (PC) with in-house software. The QA system is designed to measure the force between an immobilization device and a patient’s skin by using the FSR sensor unit. This preliminary study aimed to evaluate the feasibility of using the QA system in radiation-exposure situations. When the FSR sensor unit was irradiated with a computed tomography (CT) beam and a treatment beam from a linear accelerator (LINAC), the stability of the output signal, the image artifact on the CT image, and changing the variation on the patient’s dose were tested. The results of this study demonstrate that this system is promising in that it performed within the error range (signal variation on CT beam < 0.30 kPa, root-mean-square error (RMSE) of the two CT images according to presence or absence of the FSR sensor unit < 15 HU, signal variation on the treatment beam < 0.15 kPa, and dose difference between the presence and the absence of the FSR sensor unit < 0.02%). Based on the obtained results, we will volunteer tests to investigate the clinical feasibility of the QA system.

Original languageEnglish
Pages (from-to)803-809
Number of pages7
JournalJournal of the Korean Physical Society
Volume68
Issue number6
DOIs
StatePublished - Mar 1 2016
Externally publishedYes

Keywords

  • Force-sensing resistor
  • Immobilization-device quality assurance
  • Radiation therapy

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    Cho, M. S., Kim, T. H., Kang, S. H., Kim, D. S., Kim, K. H., Shin, D. S., Noh, Y. Y., Koo, H. J., Cheon, G. S., Suh, T. S., & Kim, S. (2016). A noble technique a using force-sensing resistor for immobilization-device quality assurance: A feasibility study. Journal of the Korean Physical Society, 68(6), 803-809. https://doi.org/10.3938/jkps.68.803