24 February 2010 A comment on the rank correlation merit function for 2D/3D registration
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Proceedings Volume 7625, Medical Imaging 2010: Visualization, Image-Guided Procedures, and Modeling; 76251W (2010); doi: 10.1117/12.845660
Event: SPIE Medical Imaging, 2010, San Diego, California, United States
Abstract
Lots of procedures in computer assisted interventions register pre-interventionally generated 3D data sets to the intraoperative situation using fast and simply generated 2D images, e.g. from a C-Arm, a B-mode Ultrasound, etc. Registration is typically done by generating a 2D image out of the 3D data set, comparison to the original 2D image using a planar similarity measure and subsequent optimisation. As these two images can be very different, a lot of different comparison functions are in use. In a recent article Stochastic Rank Correlation, a merit function based on Spearman's rank correlation coefficient was presented. By comparing randomly chosen subsets of the images, the authors wanted to avoid the computational expense of sorting all the points in the image. In the current paper we show that, because of the limited grey level range in medical images, full image rank correlation can be computed almost as fast as Pearson's correlation coefficient. A run time estimation is illustrated with numerical results using a 2D Shepp-Logan phantom at different sizes, and a sample data set of a pig.
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Michael Figl, Christoph Bloch, Wolfgang Birkfellner, "A comment on the rank correlation merit function for 2D/3D registration", Proc. SPIE 7625, Medical Imaging 2010: Visualization, Image-Guided Procedures, and Modeling, 76251W (24 February 2010); doi: 10.1117/12.845660; https://doi.org/10.1117/12.845660
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KEYWORDS
Image registration

3D image processing

Medical imaging

Correlation function

Stochastic processes

Statistical analysis

Ultrasonography

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