Int J Comput Assist Radiol Surg - Prostate multimodality image registration based on B-splines and quadrature local energy.

Tópicos

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Resumo

RPOSE: Needle biopsy of the prostate is guided by Transrectal Ultrasound (TRUS) imaging. The TRUS images do not provide proper spatial localization of malignant tissues due to the poor sensitivity of TRUS to visualize early malignancy. Magnetic Resonance Imaging (MRI) has been shown to be sensitive for the detection of early stage malignancy, and therefore, a novel 2D deformable registration method that overlays pre-biopsy MRI onto TRUS images has been proposed.METHOD: The registration method involves B-spline deformations with Normalized Mutual Information (NMI) as the similarity measure computed from the texture images obtained from the amplitude responses of the directional quadrature filter pairs. Registration accuracy of the proposed method is evaluated by computing the Dice Similarity coefficient (DSC) and 95% Hausdorff Distance (HD) values for 20 patients prostate mid-gland slices and Target Registration Error (TRE) for 18 patients only where homologous structures are visible in both the TRUS and transformed MR images.RESULTS: The proposed method and B-splines using NMI computed from intensities provide average TRE values of 2.64 ? 1.37 and 4.43 ? 2.77 mm respectively. Our method shows statistically significant improvement in TRE when compared with B-spline using NMI computed from intensities with Student's t test p = 0.02. The proposed method shows 1.18 times improvement over thin-plate splines registration with average TRE of 3.11 ? 2.18 mm. The mean DSC and the mean 95% HD values obtained with the proposed method of B-spline with NMI computed from texture are 0.943 ? 0.039 and 4.75 ? 2.40 mm respectively.CONCLUSIONS: The texture energy computed from the quadrature filter pairs provides better registration accuracy for multimodal images than raw intensities. Low TRE values of the proposed registration method add to the feasibility of it being used during TRUS-guided biopsy.

Resumo Limpo

rpose needl biopsi prostat guid transrect ultrasound trus imag trus imag provid proper spatial local malign tissu due poor sensit trus visual earli malign magnet reson imag mri shown sensit detect earli stage malign therefor novel d deform registr method overlay prebiopsi mri onto trus imag proposedmethod registr method involv bspline deform normal mutual inform nmi similar measur comput textur imag obtain amplitud respons direct quadratur filter pair registr accuraci propos method evalu comput dice similar coeffici dsc hausdorff distanc hd valu patient prostat midgland slice target registr error tre patient homolog structur visibl trus transform mr imagesresult propos method bspline use nmi comput intens provid averag tre valu mm respect method show statist signific improv tre compar bspline use nmi comput intens student t test p propos method show time improv thinplat spline registr averag tre mm mean dsc mean hd valu obtain propos method bspline nmi comput textur mm respectivelyconclus textur energi comput quadratur filter pair provid better registr accuraci multimod imag raw intens low tre valu propos registr method add feasibl use trusguid biopsi

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