Investigating the sensitivities of the photon beam line flux with a deforming electron beam orbit

In this note, we describe the upgrade effort to convert the SIAM Photon source into an Xray synchrotron radiation facility with photon energies up to some 15 keV. This conversion of SIAM Photon into a third generation light source can be achieved through an increase of the electron beam energy and the addition of recently available superconducting wavelength shifter and multipole wiggler magnets. A gradual retrofit of vacuum chambers aiming at a reduction of electron beam instabilities as well as a modification of the focusing structure are expected to greatly increase the brightness of the photon beam. These upgrades will be implemented gradually over a few years to minimize the interruption of ongoing experimental activities. As an ultimate upgrade, a study has been started which shows the feasibility to implement a 2 GeV storage ring replacing the present ring in the same foot print. This new ring is configured to provide double the number of insertion device photon beam lines.

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Improving Clinical dosimetric Accuracy of cancer treatment using a special quality of Electron and Photon Beam

Scientific Inquiry and Review ◽

10.32350/sir.53.02 ◽

2021 ◽

Vol 5 (3) ◽

Author(s):

Ayesha Ikhlaq ◽

Saeed Ahmad Buzdar ◽

Muhammad Usman Mustafa ◽

Sana Salahuddin ◽

Mehr-Un-Nisa ◽

...

Keyword(s):

Radiation Therapy ◽

Electron Beam ◽

Electron Beams ◽

Photon Beam ◽

Field Size ◽

External Beam Radiation ◽

Photon Beams ◽

Depth Dose ◽

Electron And Photon

In external beam radiation therapy, electron and photon beams have extraordinary characteristics in the treatment of cancer. The electron and photon beam characteristic are essential to study before calibration of machine. This study focused on the dosimetric characteristics of different energies of electron beams for different field size. The basic objective of this work is, to calculate dosimetric parameters and characteristics of electron beam, specially depth dose characteristics along central axis. In this work, 6 MeV, 9 MeV, 12 MeV, 15 MeV and 18 MeV of electron beam and 6 MV and 15 MV of photon beam with different field size is used. Characteristics of depth dose of electron and photon beam in water have analyzed to provide better quality of radiation therapy treatment planning. The different beam characteristics are due to different interactions that occurs between electron beams giving them a definite range whereas photon beams are attenuated leading to dose deposition and much larger range with no definite end. Depth dose characteristics of electron and photon beams do not show same characteristics as interaction of beam with matter depends on the quality of beam. Attenuation and penetration factors change with changing dosimetric parameters. Complete analysis of dosimetric characteristics of electron and photon beam help to choose more accurate beam for the treatment of cancer. This work will help to increase accuracy in treatment of cancer with radiotherapy.

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Study of unflattened photon beams shaped by multileaf collimator using BEAMnrc code

Journal of Radiotherapy in Practice ◽

10.1017/s1460396916000340 ◽

2016 ◽

Vol 15 (4) ◽

pp. 392-401

Author(s):

Ankit kajaria ◽

Neeraj Sharma ◽

Shiru Sharma ◽

Satyajit Pradhan ◽

Abhijit Mandal ◽

...

Keyword(s):

Beam Line ◽

Photon Beam ◽

Field Size ◽

Photon Beams ◽

Multileaf Collimators ◽

Depth Dose ◽

Beamnrc Code ◽

Flattening Filter Free ◽

Flattening Filter ◽

Beam Delivery

AbstractPurposeIn our study basic dosimetric properties of a flattening filter free 6 MV photon beam shaped by multileaf collimators (MLC) is examined using the Monte Carlo (MC) method.Methods and MaterialsBEAMnrc code was used to make a MC simulation model for 6 MV photon beam based on Varian Clinic 600 unique performance linac, operated with and without a flattening filter in beam line. Dosimetric features including central axis depth dose, beam profiles, photon and electron spectra were calculated and compared for flattened and unflattened cases.ResultsDosimetric field size and penumbra were found to be smaller for unflattened beam, and the decrease in field size was less for MLC shaped in comparison with jaw-shaped unflattened beam. Increase in dose rate of >2·4 times was observed for unflattened beam indicating a shorter beam delivery time for treatment. MLC leakage was found to decrease significantly when the flattening filter was removed from the beam line. The total scatter factor showed slower deviation with field sizes for unflattened beam indicating a reduced head scatter.ConclusionsOur study demonstrated that improved accelerator characteristics can be achieved by removing flattening filter from beam line.

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