Investigating the electronic portal imaging device for small radiation field measurements
Purpose: With the advent of state-of-the-art treatment technologies, the use of small fields has increased, and dosimetry in small fields is highly challenging. In this study, the potential use of Varian electronic portal imaging device (EPID) for small field measurements was explored for 6 and 15 M...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Wolters Kluwer Medknow Publications
2017-01-01
|
| Series: | Journal of Medical Physics |
| Subjects: | |
| Online Access: | http://www.jmp.org.in/article.asp?issn=0971-6203;year=2017;volume=42;issue=2;spage=59;epage=64;aulast=Agarwal |
| _version_ | 1819177084570828800 |
|---|---|
| author | Arpita Agarwal Nikhil Rastogi K J Maria Das S A Yoganathan D Udayakumar Shaleen Kumar |
| author_facet | Arpita Agarwal Nikhil Rastogi K J Maria Das S A Yoganathan D Udayakumar Shaleen Kumar |
| author_sort | Arpita Agarwal |
| collection | DOAJ |
| description | Purpose: With the advent of state-of-the-art treatment technologies, the use of small fields has increased, and dosimetry in small fields is highly challenging. In this study, the potential use of Varian electronic portal imaging device (EPID) for small field measurements was explored for 6 and 15 MV photon beams. Materials and Methods: The output factors and profiles were measured for a range of jaw-collimated square field sizes starting from 0.8 cm×0.8 cm to 10 cm×10 cm using EPID. For evaluation purpose, reference data were acquired using Exradin A16 microionization chamber (0.007 cc) for output factors and stereotactic field diode for profile measurements in a radiation field analyzer. Results: The output factors of EPID were in agreement with the reference data for field sizes down to 2 cm×2 cm and for 2 cm×2 cm; the difference in output factors was +2.06% for 6 MV and +1.56% for 15 MV. For the lowest field size studied (0.8 cm×0.8 cm), the differences were maximum; +16% for 6 MV and +23% for 15 MV photon beam. EPID profiles of both energies were closely matching with reference profiles for field sizes down to 2 cm×2 cm; however, penumbra and measured field size of EPID profiles were slightly lower compared to its counterpart. Conclusions: EPID is a viable option for profile and output factor measurements for field sizes down to 2 cm×2 cm in the absence of appropriate small field dosimeters. |
| first_indexed | 2024-12-22T21:21:02Z |
| format | Article |
| id | doaj.art-176c5a28886f449194cede7c62473feb |
| institution | Directory Open Access Journal |
| issn | 0971-6203 1998-3913 |
| language | English |
| last_indexed | 2024-12-22T21:21:02Z |
| publishDate | 2017-01-01 |
| publisher | Wolters Kluwer Medknow Publications |
| record_format | Article |
| series | Journal of Medical Physics |
| spelling | doaj.art-176c5a28886f449194cede7c62473feb2022-12-21T18:12:11ZengWolters Kluwer Medknow PublicationsJournal of Medical Physics0971-62031998-39132017-01-01422596410.4103/jmp.JMP_131_16Investigating the electronic portal imaging device for small radiation field measurementsArpita AgarwalNikhil RastogiK J Maria DasS A YoganathanD UdayakumarShaleen KumarPurpose: With the advent of state-of-the-art treatment technologies, the use of small fields has increased, and dosimetry in small fields is highly challenging. In this study, the potential use of Varian electronic portal imaging device (EPID) for small field measurements was explored for 6 and 15 MV photon beams. Materials and Methods: The output factors and profiles were measured for a range of jaw-collimated square field sizes starting from 0.8 cm×0.8 cm to 10 cm×10 cm using EPID. For evaluation purpose, reference data were acquired using Exradin A16 microionization chamber (0.007 cc) for output factors and stereotactic field diode for profile measurements in a radiation field analyzer. Results: The output factors of EPID were in agreement with the reference data for field sizes down to 2 cm×2 cm and for 2 cm×2 cm; the difference in output factors was +2.06% for 6 MV and +1.56% for 15 MV. For the lowest field size studied (0.8 cm×0.8 cm), the differences were maximum; +16% for 6 MV and +23% for 15 MV photon beam. EPID profiles of both energies were closely matching with reference profiles for field sizes down to 2 cm×2 cm; however, penumbra and measured field size of EPID profiles were slightly lower compared to its counterpart. Conclusions: EPID is a viable option for profile and output factor measurements for field sizes down to 2 cm×2 cm in the absence of appropriate small field dosimeters.http://www.jmp.org.in/article.asp?issn=0971-6203;year=2017;volume=42;issue=2;spage=59;epage=64;aulast=AgarwalDosimetryelectronic portal imaging deviceportal dosimetrysmall field dosimetry |
| spellingShingle | Arpita Agarwal Nikhil Rastogi K J Maria Das S A Yoganathan D Udayakumar Shaleen Kumar Investigating the electronic portal imaging device for small radiation field measurements Journal of Medical Physics Dosimetry electronic portal imaging device portal dosimetry small field dosimetry |
| title | Investigating the electronic portal imaging device for small radiation field measurements |
| title_full | Investigating the electronic portal imaging device for small radiation field measurements |
| title_fullStr | Investigating the electronic portal imaging device for small radiation field measurements |
| title_full_unstemmed | Investigating the electronic portal imaging device for small radiation field measurements |
| title_short | Investigating the electronic portal imaging device for small radiation field measurements |
| title_sort | investigating the electronic portal imaging device for small radiation field measurements |
| topic | Dosimetry electronic portal imaging device portal dosimetry small field dosimetry |
| url | http://www.jmp.org.in/article.asp?issn=0971-6203;year=2017;volume=42;issue=2;spage=59;epage=64;aulast=Agarwal |
| work_keys_str_mv | AT arpitaagarwal investigatingtheelectronicportalimagingdeviceforsmallradiationfieldmeasurements AT nikhilrastogi investigatingtheelectronicportalimagingdeviceforsmallradiationfieldmeasurements AT kjmariadas investigatingtheelectronicportalimagingdeviceforsmallradiationfieldmeasurements AT sayoganathan investigatingtheelectronicportalimagingdeviceforsmallradiationfieldmeasurements AT dudayakumar investigatingtheelectronicportalimagingdeviceforsmallradiationfieldmeasurements AT shaleenkumar investigatingtheelectronicportalimagingdeviceforsmallradiationfieldmeasurements |