Comput Methods Programs Biomed - Evaluation of the registration of temporal series of contrast-enhanced perfusion magnetic resonance 3D images of the liver.


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The registration of 2D and 3D images is one of the key tasks in medical image processing and analysis. Accurate registration is a crucial preprocessing step for many tasks; consequently, the evaluation of its accuracy becomes necessary. Unfortunately, this is a difficult task, especially when no golden pattern (true result) is available and when the signal values may have changed between successive images to be registered. This is the case this paper deals with: we have a series of 3D images, magnetic resonance images (MRI) of the liver and adjacent areas that have to be registered. They have been taken while a contrast is diffused through the liver tissue, so intensity of each observed point changes for two reasons: contrast diffusion/perfusion and deformation of the liver (due to body movement and breathing). In this paper, we introduce a new method to automatically compare two or more registration algorithms applied to the same case of a perfusion magnetic resonance dynamic image so that the best of them can be chosen when no ground truth is available. This is done by modeling the function that gives the intensity at a given point as a functional datum, and using statistical techniques to assess its change in comparison with other functions. An example of the application is shown by comparing two parametrizations of a B-spline based registration algorithm. The main result of the proposed method is a suggestive evidence to guide the physician in the process of selecting a registration algorithm, that recommends the algorithm of minimal complexity but still suitable for the case to be analyzed.

Resumo Limpo

registr d d imag one key task medic imag process analysi accur registr crucial preprocess step mani task consequ evalu accuraci becom necessari unfortun difficult task especi golden pattern true result avail signal valu may chang success imag regist case paper deal seri d imag magnet reson imag mri liver adjac area regist taken contrast diffus liver tissu intens observ point chang two reason contrast diffusionperfus deform liver due bodi movement breath paper introduc new method automat compar two registr algorithm appli case perfus magnet reson dynam imag best can chosen ground truth avail done model function give intens given point function datum use statist techniqu assess chang comparison function exampl applic shown compar two parametr bspline base registr algorithm main result propos method suggest evid guid physician process select registr algorithm recommend algorithm minim complex still suitabl case analyz

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