Int J Comput Assist Radiol Surg - Positioning error evaluation of GPU-based 3D ultrasound surgical navigation system for moving targets by using optical tracking system.

Tópicos

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Resumo

RPOSE: A near real-time three-dimensional (3D) ultrasound navigation system has been developed for guiding surgery involving internal organs that move and change shape (e.g., abdominal surgery, fetal surgery). In practical applications, significant errors arise between the actual navigation-image positions depending on the time delay of the system. Therefore, the positioning error of the system relative to the target velocity was evaluated.METHODS: We developed a method for evaluating the positioning error of a graphics processing unit-based 3D ultrasound surgical navigation system (with an optical tracking system) for moving targets. The effectiveness of this system was quantitatively evaluated in terms of its image processing runtime, target registration error (TRE), and positioning error for a moving target. The positioning error was evaluated for a phantom (with an optical tracking marker) moving at speeds of 5-25?mm/s, and the navigation target was the center point of the phantom. The imaging range of the volume data was set to the maximum angle and range of the ultrasound diagnostic system (update rate: 4?Hz).RESULTS: The image processing runtime was 27.43 ? 4.80?ms, and the TRE was 1.50 ? 0.28?mm. The positioning error was 4.24 ? 0.12?mm for a target moving at a speed of 10?mm/s and 5.36 ? 0.10?mm for one moving at 15?mm/s.CONCLUSION: The effectiveness of an ultrasound navigation system was quantitatively evaluated by using the positioning error for a moving target. This navigation system demonstrated high calculation speed and positioning accuracy for a moving target. Therefore, it is suitable to guide the surgery of abdominal internal organs (e.g., in fetal and abdominal surgeries) that move or change shape during breathing and surgical approaches.

Resumo Limpo

rpose near realtim threedimension d ultrasound navig system develop guid surgeri involv intern organ move chang shape eg abdomin surgeri fetal surgeri practic applic signific error aris actual navigationimag posit depend time delay system therefor posit error system relat target veloc evaluatedmethod develop method evalu posit error graphic process unitbas d ultrasound surgic navig system optic track system move target effect system quantit evalu term imag process runtim target registr error tre posit error move target posit error evalu phantom optic track marker move speed mms navig target center point phantom imag rang volum data set maximum angl rang ultrasound diagnost system updat rate hzresult imag process runtim ms tre mm posit error mm target move speed mms mm one move mmsconclus effect ultrasound navig system quantit evalu use posit error move target navig system demonstr high calcul speed posit accuraci move target therefor suitabl guid surgeri abdomin intern organ eg fetal abdomin surgeri move chang shape breath surgic approach

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