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Abstract #2950

Accurate Localization of Active Devices Using Multi-Scale Analysis for Interventional MR Imaging

Julien Barbot1, Steven Shea2, Klaus Kirchberg1, Kamal Vij3, Sunil Patil2

1Center for Applied Medical Imaging, Siemens corporation, Corporate Research, Princeton, NJ, United States; 2Center for Applied Medical Imaging, Siemens corporation, Corporate Research, Baltimore, MD, United States; 3MRI Interventions, Irvine, CA, United States

In order to accurately determine and estimate the micro-coil position mounted on an interventional device, a novel multi-scale tracking method is proposed by considering the projection signal of interest as a singularity smoothed by a diffusion process. The parameter estimation is then done by performing edge detection at different scales and characterizes them to find suitable patterns for a given projection signal. The resulting patterns from different scales are combined to obtain the likelihood estimation at every position. The benefits over previously proposed methods are increased robustness, low sensitivity to noise and the ability to estimate the likelihood information at every position over the field of view.

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Keywords

ability accuracy accurately achieved acquiring actual added anatomy applied benefits blue built catheter causing characterization characterizing chart coil coils combined combining computed confidence considering construct converge corporate corporation correlation cross custom decision decomposition decreases degree detected detection detections determine device devices diffusion dimensional display done dotted drawbacks edge edges either environment estimating estimation every example executes extract false features field filtering final finally find finding flow frequency function furthermore ground hardware highest important include interleaved interval intervals interventions known light likelihood localization locally matching medical micro milliseconds model module modulus mounted needs noise noisy offers opposed optimal pattern patterns pink placed placing position positions precise previously problem process projection projections proper proposed quality reliability relies restore robust robustness saturation scale scales sensitive served several simply singularity slice smoothed solenoid spatial spectra spite steps still suitable system theoretical towards tracking transform trio truth typical utilized utilizing variations various vertical view waveform wavelet