Evaluation of international atomic energy agency technical report series-483 detector-specific output correction factor for various collimator systems
Aim: In this study, a 6MV flattening filter (FF) and 6MV FF Free (FFF) photon beam small-field output factors (OF) were measured with various collimators using different detectors. The corrected OFs were compared with the treatment planning system (TPS) calculated OFs. Materials and Methods: OF meas...
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| Format: | Article |
| Language: | English |
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Wolters Kluwer Medknow Publications
2023-01-01
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| Series: | Journal of Medical Physics |
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| Online Access: | http://www.jmp.org.in/article.asp?issn=0971-6203;year=2023;volume=48;issue=3;spage=281;epage=288;aulast=Kannan |
| _version_ | 1797645553217044480 |
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| author | Mageshraja Kannan Sathiyan Saminathan Varatharaj Chandraraj D Gowtham Raj K M Ganesh |
| author_facet | Mageshraja Kannan Sathiyan Saminathan Varatharaj Chandraraj D Gowtham Raj K M Ganesh |
| author_sort | Mageshraja Kannan |
| collection | DOAJ |
| description | Aim: In this study, a 6MV flattening filter (FF) and 6MV FF Free (FFF) photon beam small-field output factors (OF) were measured with various collimators using different detectors. The corrected OFs were compared with the treatment planning system (TPS) calculated OFs. Materials and Methods: OF measurements were performed with four different types of collimators: Varian Millennium multi-leaf collimator (MLC), Elekta Agility MLC, Apex micro-MLC (mMLC) and a stereotactic cone. Ten detectors (four ionization chambers and six diodes) were used to perform the OF measurements at a depth of 10 cm with a source-to-surface distance of 90 cm. The corrected OF was calculated from the measurements. The corrected OFs were compared with existing TPS-generated OFs. Results: The use of detector-specific output correction factor (OCF) in the PTW diode P detector reduced the OF uncertainty by <4.1% for 1 cm × 1 cm Sclin. The corrected OF was compared with TPS calculated OF; the maximum variation with the IBA CC01 chamber was 3.75%, 3.72%, 1.16%, and 0.90% for 5 mm stereotactic cone, 0.49 cm × 0.49 cm Apex mMLC, 1 cm × 1 cm Agility MLC, and 1 cm × 1 cm Millennium MLC, respectively. Conclusion: The technical report series-483 protocol recommends that detector-specific OCF should be used to calculate the corrected OF from the measured OF. The implementation of OCF in the TPS commissioning will reduce the small-field OF variation by <3% for any type of detector. |
| first_indexed | 2024-03-11T14:48:33Z |
| format | Article |
| id | doaj.art-291f26c265aa42fda83ff8b7a47fe54a |
| institution | Directory Open Access Journal |
| issn | 0971-6203 1998-3913 |
| language | English |
| last_indexed | 2024-03-11T14:48:33Z |
| publishDate | 2023-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | Journal of Medical Physics |
| spelling | doaj.art-291f26c265aa42fda83ff8b7a47fe54a2023-10-30T10:15:29ZengWolters Kluwer Medknow PublicationsJournal of Medical Physics0971-62031998-39132023-01-0148328128810.4103/jmp.jmp_59_23Evaluation of international atomic energy agency technical report series-483 detector-specific output correction factor for various collimator systemsMageshraja KannanSathiyan SaminathanVaratharaj ChandrarajD Gowtham RajK M GaneshAim: In this study, a 6MV flattening filter (FF) and 6MV FF Free (FFF) photon beam small-field output factors (OF) were measured with various collimators using different detectors. The corrected OFs were compared with the treatment planning system (TPS) calculated OFs. Materials and Methods: OF measurements were performed with four different types of collimators: Varian Millennium multi-leaf collimator (MLC), Elekta Agility MLC, Apex micro-MLC (mMLC) and a stereotactic cone. Ten detectors (four ionization chambers and six diodes) were used to perform the OF measurements at a depth of 10 cm with a source-to-surface distance of 90 cm. The corrected OF was calculated from the measurements. The corrected OFs were compared with existing TPS-generated OFs. Results: The use of detector-specific output correction factor (OCF) in the PTW diode P detector reduced the OF uncertainty by <4.1% for 1 cm × 1 cm Sclin. The corrected OF was compared with TPS calculated OF; the maximum variation with the IBA CC01 chamber was 3.75%, 3.72%, 1.16%, and 0.90% for 5 mm stereotactic cone, 0.49 cm × 0.49 cm Apex mMLC, 1 cm × 1 cm Agility MLC, and 1 cm × 1 cm Millennium MLC, respectively. Conclusion: The technical report series-483 protocol recommends that detector-specific OCF should be used to calculate the corrected OF from the measured OF. The implementation of OCF in the TPS commissioning will reduce the small-field OF variation by <3% for any type of detector.http://www.jmp.org.in/article.asp?issn=0971-6203;year=2023;volume=48;issue=3;spage=281;epage=288;aulast=Kannanoutput factorsmall-field dosimetrystereotactic conetechnical report series - 483treatment planning systems |
| spellingShingle | Mageshraja Kannan Sathiyan Saminathan Varatharaj Chandraraj D Gowtham Raj K M Ganesh Evaluation of international atomic energy agency technical report series-483 detector-specific output correction factor for various collimator systems Journal of Medical Physics output factor small-field dosimetry stereotactic cone technical report series - 483 treatment planning systems |
| title | Evaluation of international atomic energy agency technical report series-483 detector-specific output correction factor for various collimator systems |
| title_full | Evaluation of international atomic energy agency technical report series-483 detector-specific output correction factor for various collimator systems |
| title_fullStr | Evaluation of international atomic energy agency technical report series-483 detector-specific output correction factor for various collimator systems |
| title_full_unstemmed | Evaluation of international atomic energy agency technical report series-483 detector-specific output correction factor for various collimator systems |
| title_short | Evaluation of international atomic energy agency technical report series-483 detector-specific output correction factor for various collimator systems |
| title_sort | evaluation of international atomic energy agency technical report series 483 detector specific output correction factor for various collimator systems |
| topic | output factor small-field dosimetry stereotactic cone technical report series - 483 treatment planning systems |
| url | http://www.jmp.org.in/article.asp?issn=0971-6203;year=2023;volume=48;issue=3;spage=281;epage=288;aulast=Kannan |
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