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Wahabi JM, Ung NM, Mahdiraji GA, Wong JHD. Development and characterisation of a plastic scintillator dosemeter in high-energy photon beams. RADIATION PROTECTION DOSIMETRY 2024; 200:264-273. [PMID: 38123475 DOI: 10.1093/rpd/ncad303] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 10/22/2023] [Accepted: 11/15/2023] [Indexed: 12/23/2023]
Abstract
The radioluminescent (RL) dosemeter is excellent for real-time radiation measurement and can be used in various applications. A plastic scintillator is often the choice sensor because of its size and tissue equivalency. This study aims to characterise a novel plastic scintillator irradiated with high-energy photon beams. An RL dosimetry system was developed using the plastic scintillator. The RL dosimetry system was irradiated using a linear accelerator to characterise the dose linearity, dose rate, energy dependency and depth dose. The developed system showed a linear response toward the dose and dose rate. An energy dependency factor of 1.06 was observed. Depth dose measurement showed a mean deviation of 1.21% from the treatment planning system. The response and characteristics of the plastic scintillator show that it may be used as an alternative in an RL dosimetry system.
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Affiliation(s)
- Janatul M Wahabi
- Department of Biomedical Imaging, Faculty of Medicine, Universiti Malaya, Kuala Lumpur 50603, Malaysia
- Ministry of Health Malaysia, Putrajaya 62590, Malaysia
| | - N M Ung
- Clinical Oncology Unit, Faculty of Medicine, Universiti Malaya, Kuala Lumpur 50603, Malaysia
| | | | - Jeannie H D Wong
- Department of Biomedical Imaging, Faculty of Medicine, Universiti Malaya, Kuala Lumpur 50603, Malaysia
- Centre for Medical Radiation Physics, University of Wollongong, Wollongong, NSW 2522, Australia
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Seo J, Chung K, Han Y, Jeong S, Jo Y, Oh G, Gi Y, Sung H, Ahn SH, Yoon M. Study of a plastic scintillating plate-based quality assurance system for pencil beam scanning proton beams. J Cancer Res Ther 2024; 20:85-92. [PMID: 38554303 DOI: 10.4103/jcrt.jcrt_1344_22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2022] [Accepted: 09/02/2022] [Indexed: 04/01/2024]
Abstract
INTRODUCTION The purpose of this study was to evaluate a plastic scintillating plate-based beam monitoring system to perform quality assurance (QA) measurements in pencil beam scanning proton beam. METHODS Single spots and scanned fields were measured with the high-resolution dosimetry system, consisting of a plastic scintillation plate coupled to a camera in a dark box at the isocenter. The measurements were taken at 110-190 MeV beam energies with 30° gantry angle intervals at each energy. Spot positions were determined using the plastic scintillating plate-based dosimetry system at the isocenter for 70-230 MeV beam energies with 30° gantry angle intervals. The effect of gantry angle on dose distribution was also assessed by determining the scanning pattern for daily QA and 25 fields treated with intensity-modulated proton therapy. RESULTS Spot size, field flatness, and field symmetry of plastic scintillating plate-based dosimetry system were consistent with EBT3 at all investigated energies and angles. In all investigated energies and angles, the spot size measured was ±10% of the average size of each energy, the spot position measured was within ±2 mm, field flatness was within ±2%, and field symmetry was within ±1%. The mean gamma passing rates with the 3%/3 mm gamma criterion of the scanning pattern and 25 fields were 99.2% and 99.8%, respectively. CONCLUSIONS This system can be effective for QA determinations of spot size, spot position, field flatness, and field symmetry over 360° of gantry rotation in a time- and cost-effective manner, with spatial resolution comparable to that of EBT3 film.
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Affiliation(s)
- Jaehyeon Seo
- Department of Bio-Convergence Engineering, Korea University, Seoul, Republic of Korea
| | - Kwangzoo Chung
- Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Youngyih Han
- Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
- Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Seonghoon Jeong
- Department of Proton Therapy Center, National Cancer Center, Goyang, Republic of Korea
| | - Yunhui Jo
- Institute of Global Health Technology (IGHT), Korea University, Seoul, Republic of Korea
| | - Geon Oh
- Department of Bio-Medical Engineering, Korea University, Seoul, Republic of Korea
| | - Yongha Gi
- Department of Bio-Medical Engineering, Korea University, Seoul, Republic of Korea
| | - Heehun Sung
- Department of Bio-Medical Engineering, Korea University, Seoul, Republic of Korea
| | - Sung Hwan Ahn
- Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Myonggeun Yoon
- Department of Bio-Convergence Engineering, Korea University, Seoul, Republic of Korea
- FieldCure Ltd, Seoul, Republic of Korea
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Rana S, Eckert C, Tesfamicael B. Feasibility study of utilizing Sphinx Compact for quality assurance in uniform scanning proton therapy. Phys Med 2023; 113:102468. [PMID: 36336530 DOI: 10.1016/j.ejmp.2022.10.001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Revised: 07/17/2022] [Accepted: 10/07/2022] [Indexed: 11/05/2022] Open
Abstract
PURPOSE To investigate the feasibility of utilizing the Sphinx Compact detector for quality assurance in a uniform scanning proton therapy system. METHOD The Sphinx Compact detector was used to measure various dosimetric parameters of uniform scanning proton beam at the Oklahoma Proton Center: distal range, distal-fall-off, collinearity, field symmetry, flatness, and field size for four different beams. A specially designed brass aperture was used to perform the required measurements. The Sphinx Compact measurement results were validated against the measurement results from the well-established detectors in proton therapy: IBA Zebra, IBA MatriXX-PT, EBT3 films, and Logos XRV-124. The data collected using the Sphinx Compact was analyzed in myQA software. RESULTS Based on the data analysis performed, the Sphinx Compact measurements were within acceptable accuracy to the results from the detectors mentioned in the Method section. Specifically, the lateral penumbra was within ±0.4 mm, collinearity was within ± 0.5 mm, flatness was within ±0.6 %, symmetry within ±1.6 %, distal range was within ±0.5 mm, distal-fall-off was <0.9 mm, and field size was within ±1 mm. The reproducibility of the Sphinx Compact was tested for range and collinearity, and the results were within ±0.1 mm. CONCLUSION The sphinx Compact detector could potentially replace multiple detectors utilized for monthly QA in uniform scanning proton therapy. In a multi-room center, performing the QA with one detector compared to using multiple detectors dramatically reduces total QA time and the complexity of the QA process.
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Affiliation(s)
- Suresh Rana
- Department of Medical Physics, The Oklahoma Proton Center, Oklahoma City, OK, USA; Department of Radiation Oncology, Lynn Cancer Institute, Boca Raton Regional Hospital, Baptist Health South Florida, Boca Raton, FL, USA; Department of Radiation Oncology, Florida International University, Miami, FL, USA.
| | - Colton Eckert
- Department of Medical Physics, The Oklahoma Proton Center, Oklahoma City, OK, USA
| | - Biniam Tesfamicael
- Department of Medical Physics, The Oklahoma Proton Center, Oklahoma City, OK, USA
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Kim S, Seoung YH, Kim JH, Kim K, Kim G, Kang S, Kim H, Kim B, Kothan S, Kaewjaeng S, Nam UW. Characteristics of photopolymerized tissue equivalent plastic scintillator in high dose rate radiotherapy”. Radiat Phys Chem Oxf Engl 1993 2023. [DOI: 10.1016/j.radphyschem.2022.110600] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Hsing CH, Oanh LDH, Chao TC, Lee CC, Hong JH, Cheng CC, Tseng CK, Tung CJ. MOSFET dose measurements for proton SOBP beam. Phys Med 2021; 81:185-190. [PMID: 33465755 DOI: 10.1016/j.ejmp.2020.12.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 12/06/2020] [Accepted: 12/07/2020] [Indexed: 12/15/2022] Open
Abstract
PURPOSE The aim of this work was to develop a computational scheme for the correction of the LET dependence on the MOSFET response in water phantom dose measurements for a spread-out Bragg peak (SOBP) proton beam. METHODS The LET dependence of MOSFET was attributed to the stopping power ratio of SiO2 to H2O and to the fractional hole yield in the SiO2 layer. Using literature values for the stopping powers of the continuous slowing down approximation and measured fractional hole yields vs. electric field and LET, formulas were derived for the computation of a dose-weighted correction factor of a SOBP beam. RESULTS Dose-weighted correction factors were computed for a clinical 190-MeV proton SOBP beam in a high-density polyethylene phantom. By applying correction factors to the SOBP beam, which consisted of weighted monoenergetic Bragg peaks, the MOSFET outputs were predicted and agreed well with the measured MOSFET responses. CONCLUSION By applying LET dependent correction factors to MOSFET data, quality assurance of dose verification based on MOSFET measurements becomes possible for proton therapy.
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Affiliation(s)
- Chun-Hui Hsing
- Medical Physics Research Center, Institute for Radiological Research, Chang Gung University and Chang Gung Memorial Hospital, Guishan Dist., Taoyuan City 333, Taiwan; Particle Physics and Beam Delivery Core Laboratory, Institute for Radiological Research, Chang Gung University/Chang Gung Memorial Hospital, Guishan, Taoyuan 333, Taiwan
| | - Luu Dang Hoang Oanh
- Department of Medical Imaging and Radiological Sciences, Chang Gung University, Guishan Dist., Taoyuan City 333, Taiwan
| | - Tsi-Chian Chao
- Medical Physics Research Center, Institute for Radiological Research, Chang Gung University and Chang Gung Memorial Hospital, Guishan Dist., Taoyuan City 333, Taiwan; Department of Medical Imaging and Radiological Sciences, Chang Gung University, Guishan Dist., Taoyuan City 333, Taiwan
| | - Chung-Chi Lee
- Medical Physics Research Center, Institute for Radiological Research, Chang Gung University and Chang Gung Memorial Hospital, Guishan Dist., Taoyuan City 333, Taiwan; Department of Medical Imaging and Radiological Sciences, Chang Gung University, Guishan Dist., Taoyuan City 333, Taiwan
| | - Ji-Hong Hong
- Department of Radiation Oncology, Chang Gung Memorial Hospital, Guishan, Taoyuan 333, Taiwan
| | - Chun-Chi Cheng
- National Space Organization, 8F, No.9, Prosperity 1st Rd., Hsinchu Science Park, Hsinchu 33378, Taiwan
| | - Chien-Kai Tseng
- National Space Organization, 8F, No.9, Prosperity 1st Rd., Hsinchu Science Park, Hsinchu 33378, Taiwan
| | - Chuan-Jong Tung
- Medical Physics Research Center, Institute for Radiological Research, Chang Gung University and Chang Gung Memorial Hospital, Guishan Dist., Taoyuan City 333, Taiwan; Department of Medical Imaging and Radiological Sciences, Chang Gung University, Guishan Dist., Taoyuan City 333, Taiwan.
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