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Proceedings Paper

Intensity-sorting algorithm for generating MR angiograms
Author(s): Steven Schreiner; Robert L. Galloway Jr.; Charles A. Edwards II; Judith G. Thomas
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Paper Abstract

Maximum-intensity projection (MIP) algorithms are currently used for construction of magnetic resonance (MR) angiograms. In this application, projections calculated at different angles through the image are used to form a cine loop, thus providing a three-dimensional representation from which vascular structure may be deciphered. MIP algorithms cast parallel rays through the MR image volume which has been acquired such that the flow within the vasculature has the highest intensities. The maximum voxel intensity along each ray is placed on the projection plane where the ray meets the plane. Thus, the flow within the vasculature shows up in the projection plane. This research strives to discover methods of reducing the projection calculation time, thus making the technology more accessible to users of less powerful systems. A novel approach was developed for calculating projections in which each image slice was pre-sorted into bins of intensities. By thresholding the intensities used, the background pixels can be ignored and only those intensities that relate to flow are used in the projection. Thresholding reduces the total number of pixels considered for the projection plane, thereby saving calculation time. Additional time savings resulted from precalculating projection `templates' and filling multiple projection planes at the same time. The algorithms were written in C on a 80386-based system. The new algorithm demonstrated more than a seven-fold increase in projection calculation speed over a benchmark algorithm.

Paper Details

Date Published: 1 June 1992
PDF: 11 pages
Proc. SPIE 1652, Medical Imaging VI: Image Processing, (1 June 1992); doi: 10.1117/12.59423
Show Author Affiliations
Steven Schreiner, Vanderbilt Univ. (United States)
Robert L. Galloway Jr., Vanderbilt Univ. (United States)
Charles A. Edwards II, Vanderbilt Univ. (United States)
Judith G. Thomas, Vanderbilt Univ. (United States)

Published in SPIE Proceedings Vol. 1652:
Medical Imaging VI: Image Processing
Murray H. Loew, Editor(s)

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