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Gray-scale connectivity concept for visualizing MRA and CTA volumes
Uppsala Univ. Sweden.ORCID iD: 0000-0002-7750-1917
Swedish Univ. of Agricultural Sciences, Sweden.
Uppsala Univ. and Swedish Univ. of Agricultural Sciences, Sweden.
1999 (English)In: SPIE Proc,1999, 1999, 212-219 p.Conference paper (Refereed)
Abstract [en]

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 then processes the data, ideally yielding a 3D dataset representing only vessels of interest (e.g. arteries) , while removing other structures (e.g. veins) . 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 ( "seed") 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.

Place, publisher, year, edition, pages
1999. 212-219 p.
Keyword [en]
Magnetic resonance angiography, CT angiography, visualization, projection, greyscale connectivity
National Category
Medical and Health Sciences
URN: urn:nbn:se:liu:diva-27442DOI: 10.1117/12.349432Local ID: 12095OAI: diva2:247994
SPIE - The International Society for Optical Engineering 1999
Available from: 2009-10-08 Created: 2009-10-08 Last updated: 2013-09-05

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Smedby, Örjan
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ReferencesLink to record
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