Sep 12, 2010 - Centro Oncológico de Chihuahua, Hacienda de la Esperanza 6304, ... Instituto Nacional de Investigaciones Nucleares, La Marquesa, Ocoyoac.
Calculation and Verification of a Planar Pencil Beam Kernel Through ...
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09/12/2010 10:43 a.m.
Calculation and Verification of a Planar Pencil Beam Kernel Through ...
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http://scitation.aip.org/getabs/servlet/GetabsServlet?prog=normal&id...
AIP Conf. Proc. / Volume 1310 / Issue 1
Calculation and Verification of a Planar Pencil Beam Kernel Through the Hankel Measured OARs for a Radiosurgery System with Cones AIP Conf. Proc. -- December 7, 2010 -- Volume 1310, pp. 150-153 ELEVENTH MEXICAN SYMPOSIUM ON MEDICAL PHYSICS; doi:10.1063/1.3531594 Issue Date: 7 December 2010
Milton X. Vargas Verdesotoa and José T. Alvarez Romerob a
Centro Oncológico de Chihuahua, Hacienda de la Esperanza 6304, Chihuahua, Chihuahua, México
b
SSDL, Departamento de Metrología de Radiaciones Ionizantes, Instituto Nacional de Investigaciones Nucleares, La Marquesa, Ocoyoac 52750, México
A planar multienergetic pencil beam kernel with rotational symmetry is calculated for a stereotactic radiosurgery syste with cones, employing the deconvolution method of the off axis ratio profile, OAR, corresponding to the cone of 35 mm MV photon beam produced by a linear accelerator Varian 2100 C/D. Before the deconvolution, the experimental OAR beam divergence and variations of the spectral fluence , using a boundary function BF. The function BF and the flu transformed to the conjugate space with the zero order Hankel function, which is the appropriate transform due to the the circular beams generated by the cones. The kernel in the conjugate space is obtained as the ratio of the transform transform of , therefore the kernel in the real space is calculated as the inverse transform of the kernel in the conjug validate the kernel in the real space, it is convolved with the fluence of the cones of 7.5, 12.5, 15, 17.5, 20, 22.5, 25, 3 diameter. The comparison of the OARs calculated and measured shows a maximum difference of 4.5% in the zones o dose, and a difference less than 2% in the regions of low gradient of dose. Finally, the expanded uncertainty of the ke reported. ©2010 American Institute of Physics Permalink:
http://link.aip.org/link/?APCPCS/1310/150/1
KEYWORDS and PACS Keywords radiotherapy, cancer, Bessel functions PACS 87.53.Jw Therapeutic applications (ionizing radiation) 87.19.xj Cancer 02.30.Sa Functional analysis YEAR: 2010
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09/12/2010 10:43 a.m.
