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Gamma Passing Rate – Correlation with Patient Specific Quality Assurance Devices using Two Photon energies in Pelvic IMRT

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Title Gamma Passing Rate – Correlation with Patient Specific Quality Assurance Devices using Two Photon energies in Pelvic IMRT
 
Creator Nigam, Jitendra
Kumar, Piyush
Singh, P P
N S, Silambarasan
S, Navitha
 
Subject Gamma Analysis
IMRT
MatriXX
EPID
PSQA
Pelvis
Gamma Passing Rate
6 MV
10 MV Photon Energy
 
Description 773-782
The effect on Gamma Passing Rate is studied by changing the Photon Energy in the Patient Specific Quality Assurance
in Pelvic IMRT using EPID and MatriXX keeping PSQA device at Isocenter. Dose verification of 62 patients, suffering
from pelvic malignancies and treated with Intensity modulated radiation therapy (IMRT), with EPID and MatriXX using
gamma criteria of 3%/3 mm, 3%/2 mm, 2%/3 mm, 2%/2 mm and investigated the effect on Gamma Passing Rate (%GP) by
changing beam energy from 6 MV to 10 MV. The results demonstrated that the behavior of gamma passing rate decreases as
criteria is changed from 3%/3 mm to strict criteria. The mean gamma passing rate for 6 MV beam were (%GP±Standard
Deviation σ) 99.64±0.81, 99.45±1.08, 97.57±2.12, 96.17±2.63 using the criteria 3%/3 mm, 3%/2 mm, 2%/3 mm, 2%/2 mm
respectively in EPID. For MatriXX, the mean %GP were 96.69±4.11, 93.85±5.31, 88.17±10.63, 82.2±12.28 respectively.
For 10 MV, the mean (%GP±Std. Dev) were 99.64±0.81, 99.45±1.08, 97.57±2.12, 96.17±2.63 for in EPID, 96.69±4.11,
93.85±5.31, 88.17±10.63, 82.2±12.28 for MatriXX respectively. Difference between %GP for 6 MV and 10 MV beam were
-0.01, -0.11, 1.08, 1.61 with gamma criteria of 3%/3 mm, 3%/2 mm, 2%/3 mm, 2%/2 in EPID. For MatriXX, difference
between %GP for 6 MV and 10 MV beam were -0.40, -0.24, 0.96, 1.62 respectively. It can be concluded that applying more
strict gamma criteria results in low gamma passing rate. There is marked difference in Gamma Passing Rate (%GP) with
change in photon energy.
 
Date 2022-09-02T10:59:29Z
2022-09-02T10:59:29Z
2022-09
 
Type Article
 
Identifier 0975-0959 (Online); 0301-1208 (Print)
http://nopr.niscpr.res.in/handle/123456789/60462
https://doi.org/10.56042/ijpap.v60i9.55453
 
Language en
 
Publisher NIScPR-CSIR,India
 
Source IJPAP Vol.60(09) [Sep 2022]