Evaluation of different physical parameters based on standard photon beam versus flattening filterfreein treatment cancer patients
Abdelaty, A., EL-Shershaby, A., Ashry, H., EL-Shahat, K. (2016). Evaluation of different physical parameters based on standard photon beam versus flattening filterfreein treatment cancer patients. EKB Journal Management System, 33(part1), 171-183. doi: 10.21608/jsrs.2016.15537
Aly Wagdy Abdelaty; A. M. EL-Shershaby; H. A. Ashry; K. M. EL-Shahat. "Evaluation of different physical parameters based on standard photon beam versus flattening filterfreein treatment cancer patients". EKB Journal Management System, 33, part1, 2016, 171-183. doi: 10.21608/jsrs.2016.15537
Abdelaty, A., EL-Shershaby, A., Ashry, H., EL-Shahat, K. (2016). 'Evaluation of different physical parameters based on standard photon beam versus flattening filterfreein treatment cancer patients', EKB Journal Management System, 33(part1), pp. 171-183. doi: 10.21608/jsrs.2016.15537
Abdelaty, A., EL-Shershaby, A., Ashry, H., EL-Shahat, K. Evaluation of different physical parameters based on standard photon beam versus flattening filterfreein treatment cancer patients. EKB Journal Management System, 2016; 33(part1): 171-183. doi: 10.21608/jsrs.2016.15537

Evaluation of different physical parameters based on standard photon beam versus flattening filterfreein treatment cancer patients

Journal of Scientific Research in Science
Article 14, Volume 33, part1, September 2016, Page 171-183  XML PDF (1.08 MB)
DOI: 10.21608/jsrs.2016.15537
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Authors
Aly Wagdy Abdelaty email 1; A. M. EL-Shershaby2; H. A. Ashry3; K. M. EL-Shahat4
1B.Sc. in Physics, El-Mansoura University, Radiotherapy Department Elgalaa Hospital
2Physics Department,Women Faculty for Arts, Science, and Education, Ain -Shams University
3National Center for Radiation Research and Technology, Atomic Energy Authority
4Medical Radiation Biophysics, Faculty of Medicine, Al-Azhar University
Abstract
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In radiotheraby, the purpose of using standard photon beam (Flattening Filter; FF) is to convert the forward peaked MV bremsstrahlung photon intensity into uniform intensity pattern for obtaining clinically acceptable beam profile. Recently a number of studies were carried out on existing medical linac by removing the flattening filter to produce the unflat photon beam and demonstrated their feasibility in the implementation of advanced radiotherapy techniques. Flattening Filter Free (FFF) beam have a fundamental physical parameter differences with respect to the standard filter flattened beams, making the generally used dosimetric parameters and definitions not always viable. In this concern, the current paper is a trial to shed further light on studying some dosimetric parameters for use in quality assurance of FFF beams generated by medical linacs in radiotherapy. The main characteristics of the photon beams have been analyzed using specific data generated by a Varian TrueBeamlinac having bothFFF and FF beams of 6 and 10 MV energy. Definitions for dose profile parameters are suggested starting from the renormalization of the FFF with respect to the corresponding FF beam. From this point the flatness concept has been translated into one of “unflatness” and other definitions have been proposed, maintaining a strict parallelism between FFF and FF parameter concepts. In summary, although there are a number of advantages of using a FFF beam especially for advanced radiotherapy techniques there are a few challenges (e.g., criteria for beam quality evaluation and penumbra, establishment of dosimetry methods, and consequences of photon target burn-up) which need to be addressed for establishing this beam as an alternate to the FF beam.
 
 
Keywords
Flattening filter free; beam and flattening filter; breast cancer; treatment planning; beam characteristics and multi-leaf collimators
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