A Study on the Photoneutron Dose Estimation in Flattening Filter Mode and Flattening Filter Free Mode for Medical Linear Accelerator

2017 ◽  
Vol 40 (2) ◽  
pp. 297-302
Author(s):  
Oh Nam Yang ◽  
◽  
Cheong Hwan Lim
Keyword(s):  
Linear Accelerator ◽  
Dose Estimation ◽  
Medical Linear Accelerator ◽  
Flattening Filter Free ◽  
Flattening Filter ◽  
Free Mode

scholarly journals Comparative investigation of beam quality index Q on flattening filter and flattening filter free 6 and 15 MV photon beams of an medical linear accelerator

2017 ◽  
Vol 3 (2) ◽  
pp. 287-290
Author(s):  
Michael Schaks ◽  
Johannes Zähle ◽  
Martin Janich ◽  
Patrick Hübsch ◽  
Nico Homonnay ◽  
...  
Keyword(s):  
Linear Accelerator ◽  
Quality Index ◽  
Beam Quality ◽  
Comparative Investigation ◽  
Central Axis ◽  
Photon Beams ◽  
Medical Linear Accelerator ◽  
Flattening Filter Free ◽  
Flattening Filter ◽  
Beam Quality Correction Factor

AbstractAn Elekta Synergy LINAC was used to investigate the beam quality index Q and the beam quality correction factor kQ, which is used for absolute dosimetry, in off-axis photon fields. It was found that the beam quality index Q of the photon energies with flattening filter decreases with increasing distance to the central axis, at 6 MV by 4.27% and at 15 MV by 3.98% inside a range of 15 cm off-axis. The beam quality index for flattening filter free photon fields also decreases with increasing distance to the central axis. In this case Q changed only by 1.01% inside the above range.

Treatment vault shielding for a flattening filter-free medical linear accelerator

2009 ◽  
Vol 54 (5) ◽  
pp. 1265-1273 ◽  
Author(s):  
Stephen F Kry ◽  
Rebecca M Howell ◽  
Jerimy Polf ◽  
Radhe Mohan ◽  
Oleg N Vassiliev
Keyword(s):  
Linear Accelerator ◽  
Medical Linear Accelerator ◽  
Flattening Filter Free ◽  
Flattening Filter

scholarly journals Open beam dosimetric characteristics of True Beam medical linear accelerator with flattening filter (WFF) and flattening filter free (FFF) beam

2018 ◽  
Vol 24 (2) ◽  
pp. 79-89 ◽  
Author(s):  
Karthick Raj Mani ◽  
Md Anisuzzaman Bhuiyan ◽  
Md. Shakilur Rahman ◽  
S. M. Azharur Islam
Keyword(s):  
Dose Rate ◽  
Linear Accelerator ◽  
Maximum Dose ◽  
Published Data ◽  
Depth Dose ◽  
Medical Linear Accelerator ◽  
Flattening Filter Free ◽  
Dosimetric Data ◽  
Flattening Filter ◽  
Maximum Dose Rate

Abstract True Beam medical linear accelerator is capable of delivering flattening filter free (FFF) and with flattening filter (WFF) photon beams. True Beam linear accelerator is equipped with five photon beam energies (6 FFF, 6 WFF, 10 FFF, 10 WFF and 15 WFF) as well as six electron beam energies (6 MeV, 9 MeV, 12 MeV, 15 MeV and 18 MeV). The maximum dose rate for the 6 WFF, 10 WFF and 15 WFF is 600 MU/min, whereas 6 FFF has a maximum dose rate of 1400 MU/min and 10 FFF with a maximum dose rate of 2400 MU/min. In this report we discussed the open beam dosimetric characteristics of True Beam medical linear accelerator with FFF and WFF beam. All the dosimetric data (i.e. depth dose, cross-line profiles, diagonal profiles, output factors, MLC transmission, etc.) for 6 MV, 6 FFF, 10 MV, 10 FFF and 15 MV were measured and compared with the published data of the True Beam. Multiple detectors were used in order to obtain a consistent dataset. The measured data has a good consistency with the reference golden beam data. The measured beam quality index for all the beams are in good agreement with the published data. The percentage depth dose at 10 cm depth of all the available photon beams was within the tolerance of the Varian acceptance specification. The dosimetric data shows consistent and comparable results with the published data of other True Beam linear accelerators. The dosimetric data provide us an appreciated perception and consistent among the published data and may be used for future references.

scholarly journals Is attenuation technique sensitive enough to be used to make distinction between FF and FFF spectrum of therapy linac

2019 ◽  
Vol 34 (2) ◽  
pp. 145-148
Author(s):  
Arpad Toth ◽  
Luka Dragojlovic ◽  
Nevena Ignjatov ◽  
Mirjana Mikalacki ◽  
Miodrag Krmar
Keyword(s):  
Linear Accelerator ◽  
Energy Spectra ◽  
Photon Beams ◽  
Important Conclusion ◽  
Operating Modes ◽  
Flattening Filter Free ◽  
Sensitive Tool ◽  
Flattening Filter ◽  
Free Mode ◽  
The Difference

The purpose of this study was to check if attenuation analysis is sensitive enough to make a distinction between photon energy spectra of standard accelerators and accelerators operating without a field flattening filter. Attenuation measurements were performed in two operating modes of a medical linear accelerator: with a flattening filter and without it, at nominal energy of 6 MV. Numerical and Laplace transform pair methods were used for spectra reconstruction. Although the difference between two attenuation curves is very small, as expected both reconstruction techniques produce slightly softer spectra at flattening filter free mode. The most important conclusion of this pilot study is that attenuation analysis can be a sensitive tool which is able to detect spectral differences between photon beams of an accelerator operating in two regimes.

scholarly journals Initial Clinical Experience Treating Patients with Breast Cancer on a 6-MV Flattening-Filter-Free O-Ring Linear Accelerator

2019 ◽  
Vol 4 (4) ◽  
pp. 571-578 ◽  
Author(s):  
Andrew R. Barsky ◽  
Fionnbarr O'Grady ◽  
Christopher Kennedy ◽  
Neil K. Taunk ◽  
Lei Dong ◽  
...  
Keyword(s):  
Breast Cancer ◽  
Clinical Experience ◽  
Linear Accelerator ◽  
Flattening Filter Free ◽  
Flattening Filter ◽  
Initial Clinical Experience

scholarly journals Beam characterization of 10-MV photon beam from medical linear accelerator without flattening filter

2017 ◽  
Vol 42 (2) ◽  
pp. 65
Author(s):  
Tomohiro Shimozato ◽  
Yuichi Aoyama ◽  
Takuma Matsunaga ◽  
Katsuyoshi Tabushi
Keyword(s):  
Linear Accelerator ◽  
Photon Beam ◽  
Medical Linear Accelerator ◽  
Beam Characterization ◽  
Flattening Filter
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