Title :
Colorectal MRI image registration using phase mutual information from non-parametric probability density function estimator
Author :
Zhang, Weiwei ; Joshi, Niranjan ; Brady, Michael
Author_Institution :
Dept. of Eng. Sci., Univ. of Oxford, Oxford
Abstract :
We propose a nonrigid registration algorithm and apply it to align pre- and post-chemotherapy colorectal MRI images. The algorithm combines feature-based and intensity-based image registration methods. We use local phase, as computed by monogenic signal, as the feature descriptor, and as the similarity measure in the registration algorithm, phase mutual information, which is estimated using NP windows, a non-parametric probability density function (PDF) estimator. Local deformations are modeled using the polyaffine transformation, which guarantees a smooth and invertible warping toward high image resolution. The algorithm is implemented in an adaptive manner, which makes the registration efficient and reliable. We show encouraging preliminary results and will include a performance evaluation on fives of cases in the final paper.
Keywords :
biomedical MRI; image registration; image resolution; medical image processing; colorectal MRI; feature descriptor; image registration; image resolution; invertible warping; local deformations; monogenic signal; nonparametric probability density function estimator; nonrigid registration algorithm; phase mutual information; polyaffine transformation; Cancer; Cathode ray tubes; Density measurement; Image registration; Magnetic resonance imaging; Mutual information; Phase estimation; Phase measurement; Probability density function; Tumors; Colorectal Image; Local Phase; Mutual Information; Nonrigid Registration; Polyaffine Transformation;
Conference_Titel :
Biomedical Imaging: From Nano to Macro, 2008. ISBI 2008. 5th IEEE International Symposium on
Conference_Location :
Paris
Print_ISBN :
978-1-4244-2002-5
Electronic_ISBN :
978-1-4244-2003-2
DOI :
10.1109/ISBI.2008.4541193