scholarly journals Irradiation of lung and esophagus tumors: A comparison of dose distributions calculated by anisotropic analytical algorithm and pencil beam convolution algorithm, a retrospective dosimetric study

2014 ◽  
Vol 2 (2) ◽  
pp. 020210 ◽  
Author(s):  
Emmanuel Amankwaa-Frempong ◽  
Frederik Vernimmen ◽  
Samuel Blay ◽  
Ramalingam Ezhilalan
Keyword(s):  
Pencil Beam ◽  
Dose Distributions ◽  
Anisotropic Analytical Algorithm ◽  
Convolution Algorithm ◽  
Analytical Algorithm ◽  
Dosimetric Study

scholarly journals Dose prediction accuracy of anisotropic analytical algorithm and pencil beam convolution algorithm beyond high density heterogeneity interface

2013 ◽  
Vol 02 (01) ◽  
pp. 026-030 ◽  
Author(s):  
Suresh B. Rana
Keyword(s):  
Heterogeneous Media ◽  
Dose Calculation ◽  
High Density ◽  
Photon Beam ◽  
Planning System ◽  
Pencil Beam ◽  
Beam Radiation ◽  
Anisotropic Analytical Algorithm ◽  
Convolution Algorithm ◽  
Analytical Algorithm

Abstract Purpose: It is well known that photon beam radiation therapy requires dose calculation algorithms. The objective of this study was to measure and assess the ability of pencil beam convolution (PBC) and anisotropic analytical algorithm (AAA) to predict doses beyond high density heterogeneity. Materials and Methods: An inhomogeneous phantom of five layers was created in Eclipse planning system (version 8.6.15). Each layer of phantom was assigned in terms of water (first or top), air (second), water (third), bone (fourth), and water (fifth or bottom) medium. Depth doses in water (bottom medium) were calculated for 100 monitor units (MUs) with 6 Megavoltage (MV) photon beam for different field sizes using AAA and PBC with heterogeneity correction. Combinations of solid water, Poly Vinyl Chloride (PVC), and Styrofoam were then manufactured to mimic phantoms and doses for 100 MUs were acquired with cylindrical ionization chamber at selected depths beyond high density heterogeneity interface. The measured and calculated depth doses were then compared. Results: AAA′s values had better agreement with measurements at all measured depths. Dose overestimation by AAA (up to 5.3%) and by PBC (up to 6.7%) was found to be higher in proximity to the high-density heterogeneity interface, and the dose discrepancies were more pronounced for larger field sizes. The errors in dose estimation by AAA and PBC may be due to improper beam modeling of primary beam attenuation or lateral scatter contributions or combination of both in heterogeneous media that include low and high density materials. Conclusions: AAA is more accurate than PBC for dose calculations in treating deep-seated tumor beyond high-density heterogeneity interface.

scholarly journals Comparison of Dose Evaluation Index by Pencil Beam Convolution and Anisotropic Analytical Algorithm in Stereotactic Radiotherapy for Lung Cancer

2009 ◽  
Vol 65 (7) ◽  
pp. 938-944
Author(s):  
Masayuki Tachibana ◽  
Yoshitaka Noguchi ◽  
Jyunichi Fukunaga ◽  
Naomi Hirano ◽  
Satoshi Yoshidome ◽  
...  
Keyword(s):  
Lung Cancer ◽  
Stereotactic Radiotherapy ◽  
Evaluation Index ◽  
Pencil Beam ◽  
Anisotropic Analytical Algorithm ◽  
Dose Evaluation ◽  
Analytical Algorithm

SU-E-T-759: Evaluation of Pencil Beam Convolution and Anisotropic Analytical Algorithm in Stereotactic Lung Irradiation

2011 ◽  
Vol 38 (6Part22) ◽  
pp. 3665-3665
Author(s):  
Tania De La Fuente Herman ◽  
K Hibbitts ◽  
T Herman ◽  
S Ahmad
Keyword(s):  
Pencil Beam ◽  
Anisotropic Analytical Algorithm ◽  
Analytical Algorithm ◽  
Lung Irradiation
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