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- W2068601519 abstract "The purpose of the paper is to present and evaluate the performance of a new software-based registration system for patient setup verification, during radiotherapy, using electronic portal images. The estimation of setup errors, using the proposed system, can be accomplished by means of two alternate registration methods. (a) The portal image of the current fraction of the treatment is registered directly with the reference image (digitally reconstructed radiograph (DRR) or simulator image) using a modified manual technique. (b) The portal image of the current fraction of the treatment is registered with the portal image of the first fraction of the treatment (reference portal image) by applying a nearly automated technique based on self-organizing maps, whereas the reference portal has already been registered with a DRR or a simulator image. The proposed system was tested on phantom data and on data from six patients. The root mean square error (RMSE) of the setup estimates was<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=E1><mml:mrow><mml:mn>0.8</mml:mn><mml:mo>±</mml:mo><mml:mn>0.3</mml:mn></mml:mrow></mml:math>(mean value<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=E2><mml:mo>±</mml:mo></mml:math>standard deviation) for the phantom data and<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=E3><mml:mrow><mml:mn>0.3</mml:mn><mml:mo>±</mml:mo><mml:mn>0.3</mml:mn></mml:mrow></mml:math>for the patient data, respectively, by applying the two methodologies. Furthermore, statistical analysis by means of the Wilcoxon nonparametric signed test showed that the results that were obtained by the two methods did not differ significantly (<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=E4><mml:mi>P</mml:mi></mml:math>value<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=E5><mml:mrow><mml:mo>></mml:mo><mml:mn>0.05</mml:mn></mml:mrow></mml:math>)." @default.
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- W2068601519 date "2007-01-01" @default.
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- W2068601519 title "ESTERR-PRO: A Setup Verification Software System Using Electronic Portal Imaging" @default.
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- W2068601519 doi "https://doi.org/10.1155/2007/61523" @default.
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