Automatic assignment of elliptical ROIs: first results in planar scintigrams of the left ventricle

Several algorithms for quantitative analysis of 201Tl scintigrams require operator assigned elliptical regions. Therefore these algorithms are hampered by inter- and intra-observer errors. In this paper we present a robust algorithm to determine automatically contours with elliptical shapes. The alg...

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Bibliographic Details
Published in:European Journal of Nuclear Medicine 1989, Vol.15 (2), p.87-92
Main Authors: BLOKLAND, J. A. K, VOSSEPOEL, A. M, BAKKER, A. R, PAUWELS, E. K. J
Format: Article
Language:English
Subjects:
Algorithms
Biological and medical sciences
Cardiovascular system
Heart - diagnostic imaging
Humans
Image Processing, Computer-Assisted
Investigative techniques, diagnostic techniques (general aspects)
Medical sciences
Models, Structural
Radionuclide Imaging
Radionuclide investigations
Thallium Radioisotopes
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Summary:Several algorithms for quantitative analysis of 201Tl scintigrams require operator assigned elliptical regions. Therefore these algorithms are hampered by inter- and intra-observer errors. In this paper we present a robust algorithm to determine automatically contours with elliptical shapes. The algorithm is based on the Hough transformation and can determine the parameters describing an ellipse even in low signal-to-noise ratio images and when the contour is only partially visualized such as in non-perfused regions of the left ventricular myocardium. As long as the number of parameters to describe the shape of the contour is not too large, the same kind of algorithm can also be used for differently shaped contours, and for 3D elliptical contours as in SPECT.
ISSN:0340-6997
1619-7089
DOI:10.1007/BF00702625