Prog Med Phys.  2021 Dec;32(4):153-158. 10.14316/pmp.2021.32.4.153.

Characteristic Evaluation of Pressure Mapping System for Patient Position Monitoring in Radiation Therapy

• Kang S
• Choi CH
• Park JM
• Chung JB
• Eom KY
• Kim Ji

• KMID: 2524162
• DOI: http://doi.org/10.14316/pmp.2021.32.4.153

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.

Keyword

Pressure mapping system; Pressure distribution; Motion management; Patient setup; Real-time motion monitoring

Figure

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  Fig. 1 System configuration of the pressure mapping system. FSR, force sensing resistor; PC, personal computer.

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  Fig. 2 Pressure distribution acquisition during 30 minutes without radiation and with 15 MV photon beam, dose rate 100 MU/min. MU, monitor unit.

Reference

References

1. Keall PJ, Mageras GS, Balter JM, Emery RS, Forster KM, Jiang SB, et al. 2006; The management of respiratory motion in radiation oncology report of AAPM Task Group 76. Med Phys. 33:3874–3900. DOI: 10.1118/1.2349696. PMID: 17089851.

2. Kang SH, Yoon JW, Kim TH, Suh TS. 2012; Development of respiratory training system using individual characteristic guiding waveform. Korean J Med Phys. 23:1–7. DOI: 10.1118/1.4735051. PMID: 28519027.

3. Shin DS, Kang SH, Kim DS, Kim TH, Kim KH, Cho MS, et al. 2016; Evaluating correlation between geometrical relationship and dose difference caused by respiratory motion using statistical analysis. Prog Med Phys. 27:203–212. DOI: 10.14316/pmp.2016.27.4.203.

4. Kim JI, Choi CH, Park SY, An H, Wu HG, Park JM. 2017; Gamma evaluation with portal dosimetry for volumetric modulated arc therapy and intensity-modulated radiation therapy. Prog Med Phys. 28:61–66. DOI: 10.14316/pmp.2017.28.2.61.

5. Zhang P, Happersett L, Hunt M, Jackson A, Zelefsky M, Mageras G. 2010; Volumetric modulated arc therapy: planning and evaluation for prostate cancer cases. Int J Radiat Oncol Biol Phys. 76:1456–1462. DOI: 10.1016/j.ijrobp.2009.03.033. PMID: 19540062.

6. Studenski MT, Bar-Ad V, Siglin J, Cognetti D, Curry J, Tuluc M, et al. 2013; Clinical experience transitioning from IMRT to VMAT for head and neck cancer. Med Dosim. 38:171–175. DOI: 10.1016/j.meddos.2012.10.009. PMID: 23246253.

7. Siewerdsen JH, Jaffray DA. 2001; Cone-beam computed tomography with a flat-panel imager: magnitude and effects of x-ray scatter. Med Phys. 28:220–231. DOI: 10.1118/1.1339879. PMID: 11243347.

8. Siewerdsen JH, Moseley DJ, Burch S, Bisland SK, Bogaards A, Wilson BC, et al. 2005; Volume CT with a flat-panel detector on a mobile, isocentric C-arm: pre-clinical investigation in guidance of minimally invasive surgery. Med Phys. 32:241–254. DOI: 10.1118/1.1836331. PMID: 15719975.

9. Murphy MJ, Balter J, Balter S, BenComo JA Jr, Das IJ, Jiang SB, et al. 2007; The management of imaging dose during image-guided radiotherapy: report of the AAPM Task Group 75. Med Phys. 34:4041–4063. DOI: 10.1118/1.2775667. PMID: 17985650.

10. Freislederer P, Kügele M, Öllers M, Swinnen A, Sauer TO, Bert C, et al. 2020; Recent advanced in Surface Guided Radiation Therapy. Radiat Oncol. 15:187. DOI: 10.1186/s13014-020-01629-w. PMID: 32736570. PMCID: PMC7393906.

11. Placht S, Stancanello J, Schaller C, Balda M, Angelopoulou E. 2012; Fast time-of-flight camera based surface registration for radiotherapy patient positioning. Med Phys. 39:4–17. DOI: 10.1118/1.3664006. PMID: 22225270.

12. Zhao B, Maquilan G, Jiang S, Schwartz DL. 2018; Minimal mask immobilization with optical surface guidance for head and neck radiotherapy. J Appl Clin Med Phys. 19:17–24. DOI: 10.1002/acm2.12211. PMID: 29119677. PMCID: PMC5768028.

13. Xiao A, Crosby J, Malin M, Kang H, Washington M, Hasan Y, et al. 2018; Single-institution report of setup margins of voluntary deep-inspiration breath-hold (DIBH) whole breast radiotherapy implemented with real-time surface imaging. J Appl Clin Med Phys. 19:205–213. DOI: 10.1002/acm2.12368. PMID: 29935001. PMCID: PMC6036385.

14. Al-Handarish Y, Omisore OM, Igbe T, Han S, Li H, Du W, et al. 2020; A survey of tactile-sensing systems and their applications in biomedical engineering. Adv Mater Sci Eng. 2020:4047937. DOI: 10.1155/2020/4047937.

15. Saenz-Cogollo JF, Pau M, Fraboni B, Bonfiglio A. 2016; Pressure mapping mat for tele-home care applications. Sensors (Basel). 16:365. DOI: 10.3390/s16030365. PMID: 26978369. PMCID: PMC4813940.

16. Shieh WY, Wang CM, Chang CS. 2015; Development of a portable non-invasive swallowing and respiration assessment device. Sensors (Basel). 15:12428–12453. DOI: 10.3390/s150612428. PMID: 26024414. PMCID: PMC4507683.

17. Cho MS, Kim TH, Kang SH, Kim DS, Kim KH, Shin DS, et al. 2016; A noble technique a using force-sensing resistor for immobilization-device quality assurance: a feasibility study. J Korean Phys Soc. 68:803–809. DOI: 10.3938/jkps.68.803.

18. Kim TH, Kang SH, Kim DS, Cho MS, Kim KH, Suh TS, et al. 2015; Feasibility study of patient motion monitoring by using tactile array sensors. J Korean Phys Soc. 67:199–203. DOI: 10.3938/jkps.67.199.

19. Yoo B, Pines DJ. 2017; Development of two-dimensional interdigitated center of pressure sensor. Smart Mater Struct. 26:125013–125027. DOI: 10.1088/1361-665X/aa9427.

20. Seppälä JK, Kulmala JA. 2011; Increased beam attenuation and surface dose by different couch inserts of treatment tables used in megavoltage radiotherapy. J Appl Clin Med Phys. 12:3554. DOI: 10.1120/jacmp.v12i4.3554. PMID: 22089010. PMCID: PMC5718753.