Int J Comput Assist Radiol Surg - A motion constrained cross-wire phantom for tracked 2D ultrasound calibration.

Tópicos

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Resumo

RPOSE: Ultrasound-guided 3D interventions require calibration to relate real-time 2D images with the position and orientation of the ultrasound probe. Capturing several images of a single fixed point from different viewpoints is a simple and commonly used approach, but it is cumbersome and tedious. A new phantom for calibration was designed, built and tested to simplify this process.METHODS: A mechanical phantom that restricts the motion of the ultrasound probe was designed such that the ultrasound image always captures a designated fixed point. Software was implemented which computes calibration parameters. Although the software provides no scientific novelty, it is required to demonstrate the proof of concept and to assess the accuracy and precision of the calibration phantom. The software also illustrates how the phantom enables the fixed point to be located automatically, both in tracker device coordinates and in image pixel coordinates.RESULTS: The phantom was used to capture several hundred images of a single fixed point in less than 1?min, with different probe positions and orientations around the fixed point and with the single fixed point located in different parts of the ultrasound image. It would not be feasible to capture the same number of images by manual alignment of the probe with the fixed point.CONCLUSION: Images for single fixed point calibration can be captured easily and quickly with a new calibration phantom. Since a larger number of images can be used to compute the required parameters, the calibration robustness is increased.

Resumo Limpo

rpose ultrasoundguid d intervent requir calibr relat realtim d imag posit orient ultrasound probe captur sever imag singl fix point differ viewpoint simpl common use approach cumbersom tedious new phantom calibr design built test simplifi processmethod mechan phantom restrict motion ultrasound probe design ultrasound imag alway captur design fix point softwar implement comput calibr paramet although softwar provid scientif novelti requir demonstr proof concept assess accuraci precis calibr phantom softwar also illustr phantom enabl fix point locat automat tracker devic coordin imag pixel coordinatesresult phantom use captur sever hundr imag singl fix point less min differ probe posit orient around fix point singl fix point locat differ part ultrasound imag feasibl captur number imag manual align probe fix pointconclus imag singl fix point calibr can captur easili quick new calibr phantom sinc larger number imag can use comput requir paramet calibr robust increas

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