Int J Comput Assist Radiol Surg - An error analysis perspective for patient alignment systems.

Tópicos

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Resumo

RPOSE: This paper analyses the effects of error sources which can be found in patient alignment systems. As an example, an ultrasound (US) repositioning system and its transformation chain are assessed. The findings of this concept can also be applied to any navigation system.METHODS AND MATERIALS: In a first step, all error sources were identified and where applicable, corresponding target registration errors were computed. By applying error propagation calculations on these commonly used registration/calibration and tracking errors, we were able to analyse the components of the overall error. Furthermore, we defined a special situation where the whole registration chain reduces to the error caused by the tracking system. Additionally, we used a phantom to evaluate the errors arising from the image-to-image registration procedure, depending on the image metric used. We have also discussed how this analysis can be applied to other positioning systems such as Cone Beam CT-based systems or Brainlab's ExacTrac.RESULTS: The estimates found by our error propagation analysis are in good agreement with the numbers found in the phantom study but significantly smaller than results from patient evaluations. We probably underestimated human influences such as the US scan head positioning by the operator and tissue deformation. Rotational errors of the tracking system can multiply these errors, depending on the relative position of tracker and probe.CONCLUSIONS: We were able to analyse the components of the overall error of a typical patient positioning system. We consider this to be a contribution to the optimization of the positioning accuracy for computer guidance systems.

Resumo Limpo

rpose paper analys effect error sourc can found patient align system exampl ultrasound us reposit system transform chain assess find concept can also appli navig systemmethod materi first step error sourc identifi applic correspond target registr error comput appli error propag calcul common use registrationcalibr track error abl analys compon overal error furthermor defin special situat whole registr chain reduc error caus track system addit use phantom evalu error aris imagetoimag registr procedur depend imag metric use also discuss analysi can appli posit system cone beam ctbase system brainlab exactracresult estim found error propag analysi good agreement number found phantom studi signific smaller result patient evalu probabl underestim human influenc us scan head posit oper tissu deform rotat error track system can multipli error depend relat posit tracker probeconclus abl analys compon overal error typic patient posit system consid contribut optim posit accuraci comput guidanc system

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