Gray-scale connectivity concept for visualizing MRA and CTA volumes

Orjan Smedby; Stina Svensson; Tomas Loefstrand

doi:10.1117/12.349432

26 May 1999 Gray-scale connectivity concept for visualizing MRA and CTA volumes

Orjan Smedby, Stina Svensson, Tomas Loefstrand

Author Affiliations +

Proceedings Volume 3658, Medical Imaging 1999: Image Display; (1999) https://doi.org/10.1117/12.349432
Event: Medical Imaging '99, 1999, San Diego, CA, United States

Abstract

A 3D image processing algorithm for separating vessels in datasets from Magnetic Resonance Angiography (MRA) and Computed Tomography Angiography (CTA) has been developed and tested on clinical MRA data. Relevant and irrelevant vessels are marked interactively by the user. The algorithm them processes the data, ideally yielding a 3D dataset representing only vessels of interest, while removing other structures. The result is projected to 2D images for visualization. In contrast to traditional segmentation methods, little greyscale information is lost in the process, and the amount of interaction required is relatively small. The classification of voxels utilizes a novel greyscale connectivity measure. A comparison based on the greyscale connectivity values with marked regions is made to decide whether a voxel is of interest for visualization or not. In the projection, those voxels are excluded where the connectivity value is smaller for the relevant vascular structure than for the irrelevant ones. In cases of ambiguity, morphological operations applied to unambiguously classified regions may be used as an additional criterium. In the implementation of the connectivity computation, an iterative propagation scheme is used, similar to that used in chamfer algorithms for distance transforms.

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Orjan Smedby, Stina Svensson, and Tomas Loefstrand "Gray-scale connectivity concept for visualizing MRA and CTA volumes", Proc. SPIE 3658, Medical Imaging 1999: Image Display, (26 May 1999); https://doi.org/10.1117/12.349432

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