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Tzomakas MK, Peppa V, Alexiou A, Karakatsanis G, Episkopakis A, Michail C, Valais I, Fountos G, Kalyvas N, Kandarakis IS. A phantom based evaluation of the clinical imaging performance of electronic portal imaging devices. Heliyon 2023; 9:e21116. [PMID: 37916082 PMCID: PMC10616349 DOI: 10.1016/j.heliyon.2023.e21116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2023] [Revised: 10/14/2023] [Accepted: 10/16/2023] [Indexed: 11/03/2023] Open
Abstract
Purpose In this study an evaluation of the imaging performance of an electronic portal imaging device (EPID) is presented. The evaluation performed employing the QC-3V image quality phantom. Methods An EPID system of a 6 MV LINAC, was used to obtain images of a QC-3V EPID phantom. The X-ray source to phantom distance was 100 cm and the field size was 15x15 cm2. The irradiation conditions comprised Dose Rates (DR) of 200, 400 and 600 for a 2 MU-100 MU range. The Contrast Transfer Function (CTF), the Noise Power Spectrum (NPS), the Normalized Noise Power Spectrum (NNPS) and the Contrast-to-Noise Ratio (CNR) were studied. In addition, an alternative factor showing a frequency related output signal-to-noise ratio (SNR), the Signal-to-Noise-Frequency Response (SNFR), has been introduced. SNFR is a comprehensive quality index, easily determined in clinical environment. Results The CTF curves were found comparable to each other. The lowest values were measured at 2 MU and 200 MU/min. Concerning the NPS and NNPS graphs it was found that the values decrease up to approximately 0.3 lp/mm and demonstrate a white noise shape afterwards. SNFR values were found reducing with spatial frequency. Highest CNR were found between the region 7 and 11 of the phantom. Conclusions The influence of MU and DR on EPID performance were investigated. Image quality was assessed using the QC-3V phantom. The presented results can lead to image quality amelioration and act supportively to current image quality control routine protocols.
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Affiliation(s)
- Marios K. Tzomakas
- Radiation Physics, Materials Technology and Biomedical Imaging Laboratory, Department of Biomedical Engineering, University of West Attica, Egaleo, 12210 Athens, Greece
| | - Vasiliki Peppa
- General Hospital of Athens Alexandra, Department of Radiotherapy, 11528 Athens, Greece
| | - Antigoni Alexiou
- General Hospital of Athens Alexandra, Department of Radiotherapy, 11528 Athens, Greece
| | - Georgios Karakatsanis
- General Hospital of Athens Alexandra, Department of Radiotherapy, 11528 Athens, Greece
| | - Anastasios Episkopakis
- Elekta, 15124 Athens, Greece
- Medical Physics Laboratory, Medical School, National and Kapodistrian University of Athens, 115 27 Athens, Greece
| | - Christos Michail
- Radiation Physics, Materials Technology and Biomedical Imaging Laboratory, Department of Biomedical Engineering, University of West Attica, Egaleo, 12210 Athens, Greece
| | - Ioannis Valais
- Radiation Physics, Materials Technology and Biomedical Imaging Laboratory, Department of Biomedical Engineering, University of West Attica, Egaleo, 12210 Athens, Greece
| | - George Fountos
- Radiation Physics, Materials Technology and Biomedical Imaging Laboratory, Department of Biomedical Engineering, University of West Attica, Egaleo, 12210 Athens, Greece
| | - Nektarios Kalyvas
- Radiation Physics, Materials Technology and Biomedical Imaging Laboratory, Department of Biomedical Engineering, University of West Attica, Egaleo, 12210 Athens, Greece
| | - Ioannis S. Kandarakis
- Radiation Physics, Materials Technology and Biomedical Imaging Laboratory, Department of Biomedical Engineering, University of West Attica, Egaleo, 12210 Athens, Greece
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Lee S, Yan G, Bassett P, Gopal A, Samant S. Use of local noise power spectrum and wavelet analysis in quantitative image quality assurance for EPIDs. Med Phys 2016; 43:4996. [DOI: 10.1118/1.4959541] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
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Sresty NVNM, Alluri K, Thogata R. A study of X-ray volume imaging system in image guided radiotherapy with variable gantry rotations. INTERNATIONAL JOURNAL OF CANCER THERAPY AND ONCOLOGY 2016. [DOI: 10.14319/ijcto.41.1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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Jassal K, Sarkar B, Munshi A, Roy S. Consistency analysis for the performance of planar detector systems used in advanced radiotherapy. INTERNATIONAL JOURNAL OF CANCER THERAPY AND ONCOLOGY 2014. [DOI: 10.14319/ijcto.0301.10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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