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Issue No.06 - November/December (2010 vol.16)
pp: 1348-1357
Wei Zeng , Stony Brook University
Joseph Marino , Stony Brook University
Krishna Chaitanya Gurijala , Stony Brook University
Xianfeng Gu , Stony Brook University
Arie Kaufman , Stony Brook University
ABSTRACT
In virtual colonoscopy, CT scans are typically acquired with the patient in both supine (facing up) and prone (facing down) positions. The registration of these two scans is desirable so that the user can clarify situations or confirm polyp findings at a location in one scan with the same location in the other, thereby improving polyp detection rates and reducing false positives. However, this supine-prone registration is challenging because of the substantial distortions in the colon shape due to the patient's change in position. We present an efficient algorithm and framework for performing this registration through the use of conformal geometry to guarantee that the registration is a diffeomorphism (a one-to-one and onto mapping). The taeniae coli and colon flexures are automatically extracted for each supine and prone surface, employing the colon geometry. The two colon surfaces are then divided into several segments using the flexures, and each segment is cut along a taenia coli and conformally flattened to the rectangular domain using holomorphic differentials. The mean curvature is color encoded as texture images, from which feature points are automatically detected using graph cut segmentation, mathematic morphological operations, and principal component analysis. Corresponding feature points are found between supine and prone and are used to adjust the conformal flattening to be quasi-conformal, such that the features become aligned. We present multiple methods of visualizing our results, including 2D flattened rendering, corresponding 3D endoluminal views, and rendering of distortion measurements. We demonstrate the efficiency and efficacy of our registration method by illustrating matched views on both the 2D flattened colon images and in the 3D volume rendered colon endoluminal view. We analytically evaluate the correctness of the results by measuring the distance between features on the registered colons.
INDEX TERMS
Data registration, geometry-based techniques, medical visualization, mathematical foundations for visualization.
CITATION
Wei Zeng, Joseph Marino, Krishna Chaitanya Gurijala, Xianfeng Gu, Arie Kaufman, "Supine and Prone Colon Registration Using Quasi-Conformal Mapping", IEEE Transactions on Visualization & Computer Graphics, vol.16, no. 6, pp. 1348-1357, November/December 2010, doi:10.1109/TVCG.2010.200
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