IJMPCERO  Vol.4 No.4 , November 2015
Position Verification of the RADPOS 4-D In-Vivo Dosimetry System
Abstract: The accuracy of the position measurements obtained by the radiation positioning system (RADPOS) was evaluated under static and dynamic conditions. In the static verifications, the RADPOS was fixed to the treatment couch in a photon treatment room and a proton treatment room, and was translocated with the treatment couch in x, y and z directions. Because the presence of magnetic and/or electrically conductive materials can cause a systematic shift in the measured position by distorting the RADPOS transmitted field, the effect of metals on the performance of the positioning system was also investigated. Dynamic verification was performed using the couch drive and a dynamic anthropomorphic thorax phantom. We thus confirmed the utility of RADPOS as a position sensor to perform in vivo dosimetry.
Cite this paper: Kohno, R. , Yamaguchi, H. , Motegi, K. , Tanaka, F. , Akita, T. , Nagata, Y. , Hotta, K. , Miyagishi, T. , Nishioka, S. , Dohmae, T. and Akimoto, T. (2015) Position Verification of the RADPOS 4-D In-Vivo Dosimetry System. International Journal of Medical Physics, Clinical Engineering and Radiation Oncology, 4, 318-325. doi: 10.4236/ijmpcero.2015.44038.

[1]   Soubra, M., Cygler, J. and Mackay, G. (1994) Evaluation of a Dual Metal Oxide-Silicon Semiconductor Field Effect Transistor Detector as Radiation Dosimeter. Medical Physics, 21, 567-572.

[2]   Marcie, S., Charpiot, E., Bensadoun, R.J., Ciais, G., Herault, J., Costa, A. and Gerard, J.P. (2005) In Vivo Measurements with MOSFET Detectors in Oropharynx and Nasopharynx Intensity-Modulated Radiation Therapy. International Journal of Radiation Oncology Biology Physics, 61, 1603-1606.

[3]   Beyer, G.P., Scarantino, C.W., Prestidge, B.R., Sadeghi, A.G., Anscher, M.S., Miften, M., Carrea, T.B., Sims, M. and Black, R.D. (2007) Technical Evaluation of Radiation Dose Delivered in Prostate Cancer Patients as Measured by an Implantable MOSFET Dosimeter. International Journal of Radiation Oncology Biology Physics, 69, 925-935.

[4]   Bloemen-van Gurp, E.J., Mijnheer, B.J., Verschueren, T.A. and Lambin, P. (2007) Total Body Irradiation, toward optimal Individual Delivery: Dose Evaluation with Metal Oxide Field Effect Transistors, Thermoluminescence Detectors and a Treatment Planning System. International Journal of Radiation Oncology Biology Physics, 69, 1297-304.

[5]   Kohno, R., Hotta, K., Matsubara, K., Nishioka, S., Matsuura, T. and Kawashima, M. (2012) In Vivo Proton Dosimetry Using a MOSFET Detector in an Anthropomorphic Phantom with Tissue Inhomogeneity. Journal of Applied Clinical Medical Physics, 13, 159-167.

[6]   Cherpak, A., Ding, W., Hallil, A. and Cygler, J.E. (2009) Ecvaluation of a novel 4D in Vivo Dosimetry System. Medical Physics, 36, 1672-1679.

[7]   Cherpak, A., Serban, M., Seuntjens, J. and Cygler, J.E. (2011) 4D Dose-Position Verification in Radiation Therapy Using the RADPOS System in a Deformable Lung Phantom. Medical Physics, 38, 179-187.

[8]   Cherpak, A., Cygler, J.E., Andrusyk, S., Pantarotto, J., Macrae, R. and Perry, G. (2012) Clinical Use of a Novel in Vivo 4D Monitoring System for Simultaneous Patient Motion and Dose Measurements. Radiotherapy and Oncology, 102, 290-296.

[9]   Best Medical Canada. Operator’s Manual for the RadPos 4-D in-Vivo Dosimetry System. Health Canada: Medical Device Licence No. 84809.

[10]   Langen, K.M. and Jones, D.T.L. (2001) Organ Motion and Its Management. International Journal of Radiation Oncology Biology Physics, 50, 265-278.

[11]   Jones, D. (1993) ICRU Report 50, Prescribing, Recording, and Reporting Photon Beam Therapy. International Commission on Radiation Units and Measurements, Bethesda, Maryland.

[12]   Webb, S. (2006) Motion Effects in Intensity Modulated Radiation Therapy: A Review. Physics in Medicine and Biology, 51, R403-R425.