Int J Comput Assist Radiol Surg - Comparing two approaches to rigid registration of three-dimensional ultrasound and magnetic resonance images for neurosurgery.

Tópicos

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Resumo

RPOSE: We present a new technique for registering magnetic resonance (MR) and ultrasound images in the context of neurosurgery. It involves generating a pseudo-ultrasound (pseudo-US) from a segmented MR image and uses cross-correlation as the cost function to register the pseudo-US to the real ultrasound data. The algorithm's performance is compared with that of a state-of-the-art technique that uses a median-filtered MR image to register to a Gaussian-blurred ultrasound using a normalized mutual information (NMI) objective function.METHODS: The two methods were tested on data from 15 patients with brain tumor, including low-and high-grade gliomas, in both first operations and reoperations. Two metrics were used to evaluate registration accuracy: (1) the mean distance between corresponding points, identified on both MR and ultrasound images by two experts, and (2) ratings based on visual comparison by one neurosurgeon.RESULTS: The mean residual distance of the pseudo-US technique, 2.97 mm, is significantly more accurate (p = .0011) than that of the NMI approach, 4.86 mm. The visual assessment shows that only 4 of the 15 cases had a satisfactory initial alignment based on homologous skin-point registration. There is a significant correlation between the quantitative distance measures and the qualitative ratings (rho = 0.785).CONCLUSION: The results show that the pseudo-US rigid registration technique robustly improves the MRI-ultrasound alignment when compared with the initial alignment, even when applied to highly distorted brains and a large range of tumor sizes and appearances.

Resumo Limpo

rpose present new techniqu regist magnet reson mr ultrasound imag context neurosurgeri involv generat pseudoultrasound pseudous segment mr imag use crosscorrel cost function regist pseudous real ultrasound data algorithm perform compar stateoftheart techniqu use medianfilt mr imag regist gaussianblur ultrasound use normal mutual inform nmi object functionmethod two method test data patient brain tumor includ lowand highgrad glioma first oper reoper two metric use evalu registr accuraci mean distanc correspond point identifi mr ultrasound imag two expert rate base visual comparison one neurosurgeonresult mean residu distanc pseudous techniqu mm signific accur p nmi approach mm visual assess show case satisfactori initi align base homolog skinpoint registr signific correl quantit distanc measur qualit rate rho conclus result show pseudous rigid registr techniqu robust improv mriultrasound align compar initi align even appli high distort brain larg rang tumor size appear

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