Authors :
Kaustav Kashyap Baruah; Trishul Subham Keshri
Volume/Issue :
Volume 8 - 2023, Issue 11 - November
Google Scholar :
http://tinyurl.com/mr33zf7h
Scribd :
http://tinyurl.com/3ppuh39w
DOI :
https://doi.org/10.5281/zenodo.10377080
Abstract :
The main aim of this study to present the
dosimetric aspects of Commissioning performed on an
Elekta Compact with high dose rate for clinical
treatment. Acceptance and Commissioning Tests were
performed for 6MV photon energy on the Elekta
Compact machine. Dosimetric tests were performed and
Mechanical datas were measured and evaluated. The
measurements includes output calibration, beam quality
measurement, percent depth dose (PDD), in plane beam
profile, cross plane beam profile couch transmission
factor, tray transmission factor, wedge transmission
factor. The mechanical isocenter check w.r.t gantry,
collimator and couch were also measured and all found
within limit. The PDD of 6MV for 10 × 10cm2 field size
increases at first up to a certain depth and then
gradually falloff with depth. The in- plane flatness
symmetry values and cross-plane flatness symmetry
values for 6MV were measured and found not much
difference between them. The in-plane penumbra values
are higher than the cross-plane penumbra values for
each field sizes (5x5 cm2, 10x10 cm2, 30x30 cm2). The
output calibration and beam quality index were
measured with 0.6cc Farmer Chamber in a water
phantom and found within acceptable limit. Couch
transmission factor, tray transmission factor, wedge
transmission factor were all measured with suitable
dosimeter. The radiation treatment to patient depends
on the commissioning data modeled in the treatment
planning system. These sets of commissioning data will
be helpful to others to perform Elekta Compact
commissioning which will definitely improve patient
safety.
Keywords :
Quality Assurance, Absorbed dose, Beam quality, Flatness, Symmetry, Penumbra.
The main aim of this study to present the
dosimetric aspects of Commissioning performed on an
Elekta Compact with high dose rate for clinical
treatment. Acceptance and Commissioning Tests were
performed for 6MV photon energy on the Elekta
Compact machine. Dosimetric tests were performed and
Mechanical datas were measured and evaluated. The
measurements includes output calibration, beam quality
measurement, percent depth dose (PDD), in plane beam
profile, cross plane beam profile couch transmission
factor, tray transmission factor, wedge transmission
factor. The mechanical isocenter check w.r.t gantry,
collimator and couch were also measured and all found
within limit. The PDD of 6MV for 10 × 10cm2 field size
increases at first up to a certain depth and then
gradually falloff with depth. The in- plane flatness
symmetry values and cross-plane flatness symmetry
values for 6MV were measured and found not much
difference between them. The in-plane penumbra values
are higher than the cross-plane penumbra values for
each field sizes (5x5 cm2, 10x10 cm2, 30x30 cm2). The
output calibration and beam quality index were
measured with 0.6cc Farmer Chamber in a water
phantom and found within acceptable limit. Couch
transmission factor, tray transmission factor, wedge
transmission factor were all measured with suitable
dosimeter. The radiation treatment to patient depends
on the commissioning data modeled in the treatment
planning system. These sets of commissioning data will
be helpful to others to perform Elekta Compact
commissioning which will definitely improve patient
safety.
Keywords :
Quality Assurance, Absorbed dose, Beam quality, Flatness, Symmetry, Penumbra.