TY - JOUR ID - 32294 TI - Dosimetric Characteristics of 6 MV Modified Beams by Physical Wedges of a Siemens Linear Accelerator JO - Asian Pacific Journal of Cancer Prevention JA - APJCP LA - en SN - 1513-7368 AU - Zabihzadeh, Mansour AU - Birgani, Mohammad Javad Tahmasebi AU - Hoseini-Ghahfarokhi, Mojtaba AU - Arvandi, Sholeh AU - Hoseini, Seyed Mohammad AU - Fadaei, Mahbube AD - Department of Medical Physics, Faculty of Medicine, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran AD - Y1 - 2016 PY - 2016 VL - 17 IS - 4 SP - 1685 EP - 1689 DO - N2 - Physical wedges still can be used as missing tissue compensators or filters to alter the shape of isodose curves in a target volume to reach an optimal radiotherapy plan without creating a hotspot. The aim of this study was to investigate the dosimetric properties of physical wedges filters such as off-axis photon fluence, photon spectrum, output factor and half value layer. The photon beam quality of a 6 MV Primus Siemens modified by 150 and 450 physical wedges was studied with BEAMnrc Monte Carlo (MC) code. The calculated present depth dose and dose profile curves for open and wedged photon beam were in good agreement with the measurements. Increase of wedge angle increased the beam hardening and this effect was more pronounced at the heal region. Using such an accurate MC model to determine of wedge factors and implementation of it as a calculation algorithm in the future treatment planning systems is recommended. UR - https://journal.waocp.org/article_32294.html L1 - https://journal.waocp.org/article_32294_6e5ad2bc4b6ff9e89ec83a70f6c5e6e0.pdf ER -