Abstract
In conventional radiation therapy, regarding normal tissue tolerance, the treatment of bulk tumors is one of the remaining challenges. In order to cope with, Grid Radiation Therapy (GRT) is a technique to deliver high doses, approximately 15 - 20 Gy per fraction, to several small volumes located in a large radiation field. This can be performed using a grid block. The current work concentrates on the dosimetric characteristics of a designed mega-voltage grid, used for a unique treatment modality. A square 16 × 16 array grid block was designed and fabricated. Several dosimetric characteristics including: depth dose, Valley To Peak (VTP) ratio, and grid out-put factor were evaluated using a calibrated diode dosimeter for a range of radiation fields. The percent depth dose curves, measured in the presence of grid block, lie within those measured for the corresponding open field and a narrow beam. At the Dmax, the VTP ratio was fond to be within 17% -28%, while these ranges between 23% - 35% at a depth of 10 cm. The grid out-put factor found to be 0.78 and it slightly decreases with increasing of radiation field size. The measured dosimetric characteristics of grid block indicate that the mega-voltage grid therapy can be applied as a possible clinical modality for palliative cases.
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© 2009 Springer-Verlag Berlin Heidelberg
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Sani, K.Gk. (2009). Evaluation of dosimetric characteristics of a grid block fabricated for Mega-voltage grid therapy purposes. In: Dössel, O., Schlegel, W.C. (eds) World Congress on Medical Physics and Biomedical Engineering, September 7 - 12, 2009, Munich, Germany. IFMBE Proceedings, vol 25/1. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-03474-9_3
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DOI: https://doi.org/10.1007/978-3-642-03474-9_3
Publisher Name: Springer, Berlin, Heidelberg
Print ISBN: 978-3-642-03472-5
Online ISBN: 978-3-642-03474-9
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