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Volume 10, Number 2, 2005

Generation of predetermined isodose inclination with the use of a motor driven wedge filter

Marta Mumot, Tomasz Piotrowski, Jerzy Kierzkowski, Magdalena Popielarz


Aim The aim of this work was to determine an algorithm to obtain a predetermined inclination angle of isodoses for the Saturn 43F linear accelerator with the use of a motor driven wedge filter.
Materials/Methods It was assumed that a predetermined inclination angle of a reference isodose could be obtained after combining absorbed doses during irradiation with an open field and with a field with a constant
60° wedge. In order to fi nd relations between isodose angles and the irradiation time doses were
measured first in a plexiglas phantom and then in a water phantom at the reference depth for the combination of an open field and a fi eld with a 60° wedge. The doses measured under the wedge were normalized with use of the 60° wedge coeffi cients and converted using tabulated values of the percent depth doses into depth values. Then the angles of isodose slope were calculated.
Results The results are presented in tables and in fi gures. The polynomials used to calculate times t0 and t60 for predetermined isodose angles were obtained.
Conclusions The polynomials obtained differ from energy to energy. The differences in isodose inclination angles increase with irradiation time using a 60° wedge. The higher is the energy of the beam, the greater is the inclination of the isodoses using the same physical wedge. The differences between the results of measurements in a solid phantom and in a water phantom are due to the differences in depth dose distributions between both materials.

Signature: Rep Pract Oncol Radiother, 2005; 10(2) : 77-82


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