Int J Comput Assist Radiol Surg - Improving N-wire phantom-based freehand ultrasound calibration.


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RPOSE: ???Freehand tracked ultrasound imaging is an inexpensive non-invasive technique used in several guided interventions. This technique requires spatial calibration between the tracker and the ultrasound image plane. Several calibration devices (a.k.a. phantoms) use N-wires that are convenient for automatic procedures since the segmentation of fiducials in the images and the localization of the middle wires in space are straightforward and can be performed in real time. The procedures reported in literature consider only the spatial position of the middle wire. We investigate if better results can be achieved if the information of all the wires is equally taken into account. We also evaluated the precision and accuracy of the implemented methods to allow comparison with other methods.METHODS: ???We consider a cost function based on the in-plane errors between the intersection of all the wires with the image plane and their respective segmented points in the image. This cost function is minimized iteratively starting from a seed computed with a closed-form solution based on the middle wires.RESULTS: ???Mean calibration precision achieved with the N-wire phantom was about 0.5?mm using a shallow probe, and mean accuracy was around 1.4?mm with all implemented methods. Precision was about 2.0?mm using a deep probe.CONCLUSIONS: ???Precision and accuracy achieved with the N-wire phantom and a shallow probe are at least comparable to that obtained with other methods traditionally considered more precise. Calibration using N-wires can be done more consistently if the parameters are optimized with the proposed cost function.

Resumo Limpo

rpose freehand track ultrasound imag inexpens noninvas techniqu use sever guid intervent techniqu requir spatial calibr tracker ultrasound imag plane sever calibr devic aka phantom use nwire conveni automat procedur sinc segment fiduci imag local middl wire space straightforward can perform real time procedur report literatur consid spatial posit middl wire investig better result can achiev inform wire equal taken account also evalu precis accuraci implement method allow comparison methodsmethod consid cost function base inplan error intersect wire imag plane respect segment point imag cost function minim iter start seed comput closedform solut base middl wiresresult mean calibr precis achiev nwire phantom mm use shallow probe mean accuraci around mm implement method precis mm use deep probeconclus precis accuraci achiev nwire phantom shallow probe least compar obtain method tradit consid precis calibr use nwire can done consist paramet optim propos cost function

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