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• W2154629370 abstract "Purpose/Objective(s)To assess the utility and accuracy of a low cost three-dimensional (3D) surface laser scanner for daily monitoring of the relative position of source carriers and lead shielding device during brachytherapy of lip cancer in order to ensure optimal radiation treatment delivery.Materials/MethodsThe 3D laser scanner consisted of a consumer-grade video camera (Logitech) and red laser level. The camera was calibrated to a registration pattern for surface depth extrapolation. By sweeping the laser over an anatomically correct model of the mouth and lips at varying angles, 3D data was obtained and converted into a polygonal mesh and smooth surface map using specialized 3D modeling software and a laptop computer. A simulated lead shielding device was placed between the lips and the model mandible. An interstitial implant was designed, consisting of small plastic tubes in the deep and middle plane of the model lip tumor as well as hypodermic needles superficially. Digital calipers accurate to 0.01 mm were used to measure linear distances on the model while software measuring tools were used on the 3D reconstruction which were limited to millimeter accuracy. Triplicate measurements between eight pairs of predetermined anatomical reference points were collected. This data was compared and analyzed to determine the accuracy of the 3D reconstruction. The initial 3D reconstruction, once verified, then served as the reference for any future measurements. A second 3D reconstruction was generated without manipulation of the model. This was compared to the initial 3D reconstruction via measurements between the established reference points.ResultsThe mean difference between linear distances obtained from the initial 3D reconstruction and the actual model was 1.2 mm (range 0.9 to 1.5 mm). The mean difference between linear distances obtained from the initial 3D reconstruction and the second 3D reconstruction was 1.6 mm (range 1 to 3 mm).ConclusionsThree-dimensional surface laser scanning was very accurate with low cost consumer grade equipment. It is potentially useful for daily control of the position of source carriers and lead shielding device by comparing the initial reference 3D reconstruction with subsequent 3D reconstructions during the course of brachytherapy. This technique also has the potential to be used for other treatment sites besides the lip where a 3D surface laser scan of the implant is possible. Purpose/Objective(s)To assess the utility and accuracy of a low cost three-dimensional (3D) surface laser scanner for daily monitoring of the relative position of source carriers and lead shielding device during brachytherapy of lip cancer in order to ensure optimal radiation treatment delivery. To assess the utility and accuracy of a low cost three-dimensional (3D) surface laser scanner for daily monitoring of the relative position of source carriers and lead shielding device during brachytherapy of lip cancer in order to ensure optimal radiation treatment delivery. Materials/MethodsThe 3D laser scanner consisted of a consumer-grade video camera (Logitech) and red laser level. The camera was calibrated to a registration pattern for surface depth extrapolation. By sweeping the laser over an anatomically correct model of the mouth and lips at varying angles, 3D data was obtained and converted into a polygonal mesh and smooth surface map using specialized 3D modeling software and a laptop computer. A simulated lead shielding device was placed between the lips and the model mandible. An interstitial implant was designed, consisting of small plastic tubes in the deep and middle plane of the model lip tumor as well as hypodermic needles superficially. Digital calipers accurate to 0.01 mm were used to measure linear distances on the model while software measuring tools were used on the 3D reconstruction which were limited to millimeter accuracy. Triplicate measurements between eight pairs of predetermined anatomical reference points were collected. This data was compared and analyzed to determine the accuracy of the 3D reconstruction. The initial 3D reconstruction, once verified, then served as the reference for any future measurements. A second 3D reconstruction was generated without manipulation of the model. This was compared to the initial 3D reconstruction via measurements between the established reference points. The 3D laser scanner consisted of a consumer-grade video camera (Logitech) and red laser level. The camera was calibrated to a registration pattern for surface depth extrapolation. By sweeping the laser over an anatomically correct model of the mouth and lips at varying angles, 3D data was obtained and converted into a polygonal mesh and smooth surface map using specialized 3D modeling software and a laptop computer. A simulated lead shielding device was placed between the lips and the model mandible. An interstitial implant was designed, consisting of small plastic tubes in the deep and middle plane of the model lip tumor as well as hypodermic needles superficially. Digital calipers accurate to 0.01 mm were used to measure linear distances on the model while software measuring tools were used on the 3D reconstruction which were limited to millimeter accuracy. Triplicate measurements between eight pairs of predetermined anatomical reference points were collected. This data was compared and analyzed to determine the accuracy of the 3D reconstruction. The initial 3D reconstruction, once verified, then served as the reference for any future measurements. A second 3D reconstruction was generated without manipulation of the model. This was compared to the initial 3D reconstruction via measurements between the established reference points. ResultsThe mean difference between linear distances obtained from the initial 3D reconstruction and the actual model was 1.2 mm (range 0.9 to 1.5 mm). The mean difference between linear distances obtained from the initial 3D reconstruction and the second 3D reconstruction was 1.6 mm (range 1 to 3 mm). The mean difference between linear distances obtained from the initial 3D reconstruction and the actual model was 1.2 mm (range 0.9 to 1.5 mm). The mean difference between linear distances obtained from the initial 3D reconstruction and the second 3D reconstruction was 1.6 mm (range 1 to 3 mm). ConclusionsThree-dimensional surface laser scanning was very accurate with low cost consumer grade equipment. It is potentially useful for daily control of the position of source carriers and lead shielding device by comparing the initial reference 3D reconstruction with subsequent 3D reconstructions during the course of brachytherapy. This technique also has the potential to be used for other treatment sites besides the lip where a 3D surface laser scan of the implant is possible. Three-dimensional surface laser scanning was very accurate with low cost consumer grade equipment. It is potentially useful for daily control of the position of source carriers and lead shielding device by comparing the initial reference 3D reconstruction with subsequent 3D reconstructions during the course of brachytherapy. This technique also has the potential to be used for other treatment sites besides the lip where a 3D surface laser scan of the implant is possible." @default.
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• W2154629370 title "Utility of 3D Surface Laser Scanning in Brachytherapy of Lip Cancer" @default.
• W2154629370 doi "https://doi.org/10.1016/j.ijrobp.2009.07.1380" @default.
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