Image Quality and Information Parameters of Electronic Portal Imaging Devices
In this study, the imaging performance of electronic portal imaging devices (EPIDs) is evaluated, comparing measurements collected from EPID images captured at 115 cm, with a field size of 15 × 15 cm<sup>2</sup>, monitor units (MUs) in the range of 2 MU-100 MU and dose rates (DRs) of 200...
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MDPI AG
2024-11-01
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| Online Access: | https://www.mdpi.com/2076-3417/14/22/10260 |
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| author | Marios K. Tzomakas Vasiliki Peppa Antigoni Alexiou Georgios Karakatsanis Anastasios Episkopakis Christos Michail Ioannis Valais George Fountos Nektarios Kalyvas Ioannis S. Kandarakis |
| author_facet | Marios K. Tzomakas Vasiliki Peppa Antigoni Alexiou Georgios Karakatsanis Anastasios Episkopakis Christos Michail Ioannis Valais George Fountos Nektarios Kalyvas Ioannis S. Kandarakis |
| author_sort | Marios K. Tzomakas |
| collection | DOAJ |
| description | In this study, the imaging performance of electronic portal imaging devices (EPIDs) is evaluated, comparing measurements collected from EPID images captured at 115 cm, with a field size of 15 × 15 cm<sup>2</sup>, monitor units (MUs) in the range of 2 MU-100 MU and dose rates (DRs) of 200 MU/min, 400 MU/min and 600 MU/min, using a 6 MV LINAC system and the QC-3V image quality phantom. The analysis includes the normalized contrast transfer function (CTFnorm), the noise power spectrum (NPS) and the information capacity (IC), as well as the signal-to-noise frequency response (SNFR), which can be used as a comprehensive quality index. The results of our study are compared with previously published data captured at 100 cm under similar exposure conditions. They show similar CTF curves with different source-to-phantom distances, with the lowest values observed at specific MU and DR combinations. Moreover, NPS graphs are found to decrease with respect to spatial frequency. SNFR values also display a reduction with increasing spatial frequency. In addition, irradiation with the phantom placed closer to the EPID, 115 cm from the LINAC, yields better SNFR and IC performance characteristics, indicating better delineation of the organs closer to the EPID. The testing of EPID performance may potentially benefit from our results, which may lead to improvements in the quality of radiotherapy treatments. |
| format | Article |
| id | doaj-art-5ac6f4e8e27a4a57a91be6aee8ed4135 |
| institution | OA Journals |
| issn | 2076-3417 |
| language | English |
| publishDate | 2024-11-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj-art-5ac6f4e8e27a4a57a91be6aee8ed41352025-08-20T02:08:07ZengMDPI AGApplied Sciences2076-34172024-11-0114221026010.3390/app142210260Image Quality and Information Parameters of Electronic Portal Imaging DevicesMarios K. Tzomakas0Vasiliki Peppa1Antigoni Alexiou2Georgios Karakatsanis3Anastasios Episkopakis4Christos Michail5Ioannis Valais6George Fountos7Nektarios Kalyvas8Ioannis S. Kandarakis9Radiation Physics, Materials Technology and Biomedical Imaging Laboratory, Department of Biomedical Engineering, University of West Attica, 12210 Athens, GreeceDepartment of Radiotherapy, General Hospital of Athens Alexandra, 11528 Athens, GreeceDepartment of Radiotherapy, General Hospital of Athens Alexandra, 11528 Athens, GreeceDepartment of Radiotherapy, General Hospital of Athens Alexandra, 11528 Athens, GreeceElekta, 15124 Athens, GreeceRadiation Physics, Materials Technology and Biomedical Imaging Laboratory, Department of Biomedical Engineering, University of West Attica, 12210 Athens, GreeceRadiation Physics, Materials Technology and Biomedical Imaging Laboratory, Department of Biomedical Engineering, University of West Attica, 12210 Athens, GreeceRadiation Physics, Materials Technology and Biomedical Imaging Laboratory, Department of Biomedical Engineering, University of West Attica, 12210 Athens, GreeceRadiation Physics, Materials Technology and Biomedical Imaging Laboratory, Department of Biomedical Engineering, University of West Attica, 12210 Athens, GreeceRadiation Physics, Materials Technology and Biomedical Imaging Laboratory, Department of Biomedical Engineering, University of West Attica, 12210 Athens, GreeceIn this study, the imaging performance of electronic portal imaging devices (EPIDs) is evaluated, comparing measurements collected from EPID images captured at 115 cm, with a field size of 15 × 15 cm<sup>2</sup>, monitor units (MUs) in the range of 2 MU-100 MU and dose rates (DRs) of 200 MU/min, 400 MU/min and 600 MU/min, using a 6 MV LINAC system and the QC-3V image quality phantom. The analysis includes the normalized contrast transfer function (CTFnorm), the noise power spectrum (NPS) and the information capacity (IC), as well as the signal-to-noise frequency response (SNFR), which can be used as a comprehensive quality index. The results of our study are compared with previously published data captured at 100 cm under similar exposure conditions. They show similar CTF curves with different source-to-phantom distances, with the lowest values observed at specific MU and DR combinations. Moreover, NPS graphs are found to decrease with respect to spatial frequency. SNFR values also display a reduction with increasing spatial frequency. In addition, irradiation with the phantom placed closer to the EPID, 115 cm from the LINAC, yields better SNFR and IC performance characteristics, indicating better delineation of the organs closer to the EPID. The testing of EPID performance may potentially benefit from our results, which may lead to improvements in the quality of radiotherapy treatments.https://www.mdpi.com/2076-3417/14/22/10260EPIDLINACimage quality informationMTFperformance quality index metricsQC-3V |
| spellingShingle | Marios K. Tzomakas Vasiliki Peppa Antigoni Alexiou Georgios Karakatsanis Anastasios Episkopakis Christos Michail Ioannis Valais George Fountos Nektarios Kalyvas Ioannis S. Kandarakis Image Quality and Information Parameters of Electronic Portal Imaging Devices Applied Sciences EPID LINAC image quality information MTF performance quality index metrics QC-3V |
| title | Image Quality and Information Parameters of Electronic Portal Imaging Devices |
| title_full | Image Quality and Information Parameters of Electronic Portal Imaging Devices |
| title_fullStr | Image Quality and Information Parameters of Electronic Portal Imaging Devices |
| title_full_unstemmed | Image Quality and Information Parameters of Electronic Portal Imaging Devices |
| title_short | Image Quality and Information Parameters of Electronic Portal Imaging Devices |
| title_sort | image quality and information parameters of electronic portal imaging devices |
| topic | EPID LINAC image quality information MTF performance quality index metrics QC-3V |
| url | https://www.mdpi.com/2076-3417/14/22/10260 |
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