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Heravian Shandiz, Mahdi, Bahreyni-Toosi, Mohammad-Hossein, Safaeian Layen, Ghorban, Ziaei, Amir Hossein. (1398). New Method of Quality Control Test for Light and Radiation Field Coincidence in Medical Linear Accelerators. , 16(5), 336-340. doi: 10.22038/ijmp.2019.21250.1202
Mahdi Heravian Shandiz; Mohammad-Hossein Bahreyni-Toosi; Ghorban Safaeian Layen; Amir Hossein Ziaei. "New Method of Quality Control Test for Light and Radiation Field Coincidence in Medical Linear Accelerators". , 16, 5, 1398, 336-340. doi: 10.22038/ijmp.2019.21250.1202
Heravian Shandiz, Mahdi, Bahreyni-Toosi, Mohammad-Hossein, Safaeian Layen, Ghorban, Ziaei, Amir Hossein. (1398). 'New Method of Quality Control Test for Light and Radiation Field Coincidence in Medical Linear Accelerators', , 16(5), pp. 336-340. doi: 10.22038/ijmp.2019.21250.1202
Heravian Shandiz, Mahdi, Bahreyni-Toosi, Mohammad-Hossein, Safaeian Layen, Ghorban, Ziaei, Amir Hossein. New Method of Quality Control Test for Light and Radiation Field Coincidence in Medical Linear Accelerators. , 1398; 16(5): 336-340. doi: 10.22038/ijmp.2019.21250.1202

New Method of Quality Control Test for Light and Radiation Field Coincidence in Medical Linear Accelerators

Iranian Journal of Medical Physics
مقاله 4، دوره 16، شماره 5، آذر و دی 2019، صفحه 336-340    اصل مقاله (840.81 K)
نوع مقاله: Original Paper
شناسه دیجیتال (DOI): 10.22038/ijmp.2019.21250.1202
نویسندگان
Mahdi Heravian Shandiz1؛ Mohammad-Hossein Bahreyni-Toosi2؛ Ghorban Safaeian Layen* 3؛ Amir Hossein Ziaei3
1Medical Equipment Unit, Imam Reza Hospital, Mashhad University of Medical Sciences, Mashhad, Iran
2Medical Physics Research Center, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
3Department of Technology of Radiology, School of Paramedical Science, Mashhad University of Medical Sciences, Mashhad, Iran
چکیده
Introduction: The evaluation of X-ray and light field coincidence in linear accelerators as a quality control test is often performed subjectively, involving the manual marking of films and their visual inspection following the irradiation. Therefore, the present study aimed to develop an objective method for the performance of this test leading to the increased levels of accuracy, precision, and speed for the measurement of X-ray and light field coincidence.
Material and Methods: The new method involved a portable, lightweight, and inexpensive device containing optically-shielded and non-shielded photodiodes to detect the location and dimensions of the light and X-ray fields. The obtained results were analyzed using purpose-written user-friendly software.
Results: On the basis of the results, this system could be a reliable method to measure the coincidence of the two fields with the accuracy of 0.5 mm and average field size standard deviations of Elekta Presice and Siemens Primus are 22.47 mm2 and 22.36 mm2, respectively. The result was well within the tolerance recommended by the American Association of Physicists in Medicine task group report number 142.
Conclusion: The proposed method allows accurate and precise measurements through a largely automated process. Therefore, the measurement results benefit from the reduced level of subjectivity or human error, compared to the standard film-based technique. 
کلیدواژه‌ها
Quality Control؛ Quality Assurance؛ Radiation
مراجع

 

  1. Shandiz MH, Layen GS, Anvari K, Khalilzadeh M. New methods for optical distance indicator and gantry angle quality control tests in medical linear accelerators: Image processing by using a 3D phantom. Radiat Oncol J. 2015;33(1):42-9.
  2. Rowshanfarzad P, Sabet M, O’Connor  DJ, Greer PB. Isocenter verification for linac-based stereotactic radiation therapy: review of principles and techniques. J Appl Clin Med Phys. 2011;12(4).
  3. Welsh KT, Wlodarczyk RA, Reinstein LE. A new geometric and mechanical verification device for medical LINACs. J Appl Clin Med Phys. 2002;3(2):154-61.
  4. Hulick PR, Ascoli FA. Quality Assurance in Radiation Oncology. J Am Coll Radiol. 2005;2(7):613-16.
  5. Klein EE, Hanley J, Bayouth J, Yin FF, Simon W, Dresser S, et al. Task group 142 report: quality assurance of medical accelerators. Med Phys. 2009;36(9):4197-212.
  6. Kutcher GJ, Coia L, Gillin M, Hanson WF, Leibel S, Morton RJ, et al. Comprehensive QA for radiation oncology: report of AAPM Radiation Therapy Committee Task Group 40. Med phys. 1994;21(4):581-618.
  7. Monti AF, Frigerio M, Frigerio G. Visual verification of linac light and radiation fields coincidence. Med Dosim. 2003;28(2):91-3.
  8. Sheu R, Svoboda A, Dumane V, Lo Y. SU-E-T-203: Sensitivity Study on the Use of Computed Radiography for Linac Routine Quality Assurance - Light/radiation Field Coincidence. Medical Physics. 2011;38(6):3533.
  9. Njeh CF, Caroprese B, Desai P. A simple quality assurance test tool for the visual verification of light and radiation field congruent using electronic portal images device and computed radiography. Radiat Oncol. 2012;7:49.
  10. APPLICATION NOTE 2236, Gamma-Photon Radiation Detector. MAXIM Integrated. 2003. Available from: https://pdfserv.maximintegrated.com/en/an/AN2236.pdf.
  11. Najmabadi F. The Physics of Radiation & Radiology. Jahad Daneshgahi ATU. 2005; 527.
  12. Silicon PIN Photodiode. In: Semiconductors V, editor. VISHAY; 2011.
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