Int J Comput Assist Radiol Surg - Electromagnetic tracking for US-guided interventions: standardized assessment of a new compact field generator.

Tópicos

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Resumo

RPOSE: One of the main challenges related to electromagnetic tracking in the clinical setting is a placement of the field generator (FG) that optimizes the reliability and accuracy of sensor localization. Recently, a new mobile FG for the NDI Aurora(?) tracking system has been presented. This Compact FG is the first FG that can be attached directly to an ultrasound (US) probe. The purpose of this study was to assess the precision and accuracy of the Compact FG in the presence of nearby mounted US probes.MATERIALS AND METHODS: Six different US probes were mounted onto the Compact FG by means of a custom-designed mounting adapter. To assess precision and accuracy of the Compact FG, we employed a standardized assessment protocol. Utilizing a specifically manufactured plate, we measured positional data on three levels of distances from the FG as well as rotational data.RESULTS: While some probes had negligible influence on tracking accuracy two probes increased the mean distance error up to 1.5 mm compared with a reference measurement of 0.5 mm. The jitter error consistently stayed below 0.2 mm in all cases. The mean relative error in orientation was found to be smaller than 3?.CONCLUSION: Attachment of an US probe to the Compact FG does not have a critical influence on tracking accuracy in most cases. Clinical benefit of this promising mobile FG must be shown in future studies.

Resumo Limpo

rpose one main challeng relat electromagnet track clinic set placement field generat fg optim reliabl accuraci sensor local recent new mobil fg ndi aurora track system present compact fg first fg can attach direct ultrasound us probe purpos studi assess precis accuraci compact fg presenc nearbi mount us probesmateri method six differ us probe mount onto compact fg mean customdesign mount adapt assess precis accuraci compact fg employ standard assess protocol util specif manufactur plate measur posit data three level distanc fg well rotat dataresult probe neglig influenc track accuraci two probe increas mean distanc error mm compar refer measur mm jitter error consist stay mm case mean relat error orient found smaller conclus attach us probe compact fg critic influenc track accuraci case clinic benefit promis mobil fg must shown futur studi

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