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Design and study of a heterogeneous cost effective thorax phantom for dosimetric evaluation of analytic anisotropic algorithm (AAA) and acuros XB algorithm (AXB)


International Journal of Radiology & Radiation Therapy
Swati Dubey,1 Priyusha Bagdare,2 Sanjay Kumar Ghosh3

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Abstract

Aim of the present work is to design and study the properties of a heterogeneous thorax phantom (HTP) and its application for dosimetric evaluation of analytic anisotropic algorithm (AAA) and acuros XB (AXB) algorithm. HTP was made from the sawdust of a porous pinewood log, rib cage of bone equivalent material and natural honeybee’s wax. Density and central axis isodose depth on computed tomography (CT) images of both an actual patient and HTP were compared and analyzed. Pre-treatment plan verification of 25 patients was done using the AAA and AXB algorithm. The difference in the measured dose and the planned dose was found to be insignificant for both AAA and AXB with the significance level of 0.01 (p-value =0.03593 and p-value =0.03288). Significant difference was found between the planned dose calculated by AAA and AXB algorithm with the significance level of 0.01 (p-value =0.00094).  Results of this study demonstrate that the designed phantom resembles the human thorax and can be used to verify the accuracy of the algorithm employed.

Keywords

acuros XB algorithm, analytic anisotropic algorithm, heterogeneous phantom, pre-treatment quality assurance

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