Open AccessMeasurement of Head Scatter Factor for Linear Accelerators using Indigenously Designed Columnar Mini Phantom
Author(s) -
Murugan Appasamy,
Sidonia Valas Xavier,
Kuppusamy Thayalan,
Velayudham Ramasubramanian
Publication year - 2011
Publication title -
polish journal of medical physics and engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 5
eISSN - 1898-0309
pISSN - 1425-4689
DOI - 10.2478/v10013-011-0002-7
Subject(s) - linear particle accelerator , imaging phantom , collimator , perpendicular , wedge (geometry) , physics , head (geology) , optics , siemens , nuclear medicine , beam (structure) , mathematics , geometry , medicine , geology , quantum mechanics , geomorphology
Measurement of Head Scatter Factor for Linear Accelerators using Indigenously Designed Columnar Mini Phantom A columnar mini phantom is designed as recommended by ESTRO to measure the Head Scatter Factor (S c ) for 6 MV beam of two linear accelerators. The measurement of S c at different orientations of the chamber, parallel and perpendicular at 1.5 cm depth predicts the deviation of 2.05% and 1.9% for Elekta and Siemens linear accelerators respectively. The measurement of S c at 1.5 cm is higher compared to 10 cm depth for both the linear accelerators suggesting the electron contamination at 1.5 cm depth. The effect of wedges on S c yields a significant contribution of 3.5% and 5% for Siemens and Elekta linear accelerators respectively. The collimator exchange effect reveals the opening of upper jaw increases the S c irrespective of the linear accelerator. The result emphasizes the need of S c measurement at 10 cm. The presence of wedge influences the S c value and the SSD has no influence on S c . The measured S c values are in good agreement with the published data.