Peripheral dose measurements for 6 and 18MV photon beams on a linear accelerator with multileaf collimator

Abstract The aim of this study is to present the results of commissioning of Elekta Synergy linear accelerator (linac). The acceptance test and commissioning were performed for three photon beams energies 4 MV, 6 MV and 15 MV and for the multileaf collimator (MLC). The percent depth doses (PDDs), in-plane and cross-plane beam profiles, head scatter factors (Sc), relative photon output factors (Scp), universal wedge transmission factor and MLC transmission factors were measured. The size of gantry, collimator, and couch isocenter were also measured.

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Dose measurements compared with Monte Carlo simulations of narrow 6 MV multileaf collimator shaped photon beams

Medical Physics ◽

10.1118/1.598693 ◽

1999 ◽

Vol 26 (9) ◽

pp. 1874-1882 ◽

Cited By ~ 63

Author(s):

K. De Vlamynck ◽

H. Palmans ◽

F. Verhaegen ◽

C. De Wagter ◽

W. De Neve ◽

...

Keyword(s):

Monte Carlo ◽

Monte Carlo Simulations ◽

Multileaf Collimator ◽

Photon Beams ◽

Dose Measurements

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Dosimetric evaluation of 120-leaf multileaf collimator in a Varian linear accelerator with 6-MV and 18-MV photon beams

Journal of Medical Physics ◽

10.4103/0971-6203.42757 ◽

2008 ◽

Vol 33 (3) ◽

pp. 114 ◽

Cited By ~ 6

Author(s):

R Mohan ◽

K Jayesh ◽

RC Joshi ◽

Maha Al-idrisi ◽

P Narayanamurthy ◽

...

Keyword(s):

Linear Accelerator ◽

Multileaf Collimator ◽

Photon Beams

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Peripheral dose measurements with diode and thermoluminescence dosimeters for intensity modulated radiotherapy delivered with conventional and un-conventional linear accelerator

Journal of Medical Physics ◽

10.4103/0971-6203.106599 ◽

2013 ◽

Vol 38 (1) ◽

pp. 4 ◽

Cited By ~ 3

Author(s):

Rajesh Kinhikar ◽

Poonam Gamre ◽

Sudarshan Kadam ◽

George Biju ◽

Suryaprakash ◽

...

Keyword(s):

Linear Accelerator ◽

Intensity Modulated Radiotherapy ◽

Peripheral Dose ◽

Intensity Modulated ◽

Dose Measurements

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Monte Carlo Study of Unflattened Photon Beams Shaped by Multileaf Collimator

Journal of Biomedical Physics and Engineering ◽

10.31661/jbpe.v9i2apr.585 ◽

2019 ◽

Vol 9 (2Apr) ◽

Author(s):

A Kajaria ◽

N Sharma ◽

Sh Sharma ◽

S Pradhan ◽

A Mandal ◽

...

Keyword(s):

Monte Carlo ◽

Monte Carlo Study ◽

Beam Line ◽

Photon Beam ◽

Multileaf Collimator ◽

Photon Beams ◽

Peripheral Dose ◽

Depth Dose ◽

Field Edge ◽

Flattening Filter

Introduction: This study investigates basic dosimetric properties of unflattened 6 MV photon beam shaped by multileaf collimator and compares them with those of flattened beams.Materials and Methods: Monte Carlo simulation model using BEAM code was developed for a 6MV photon beam based on Varian Clinic 600 unique performance linac operated with and without a flattening filter in beam line. Dosimetric features including lateral profiles, central axis depth dose, photon and electron spectra were calculated for flattened and unflattened cases, separately.Results: An increase in absolute depth dose with a factor of more than 2.4 was observed for unflattened beam which was dependent on depth. PDDs values were found to be lower for unflattened beam for all field sizes. Significant decrease in calculated mlc leakage was observed when the flattening filter was removed from the beam line. The total scatter factor, SCP was found to show less variation with field sizes for unflattened beam indicating a decrease in head scatter. The beam profiles for unflattened case are found to have lower relative dose value in comparison with flattened beam near the field edge, and it falls off faster with distance.Conclusion: Our study showed that increase in the dose rate and lower peripheral dose could be considered as realistic advantages for unflattened 6MV photon beams.

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