Estimation of Coronary Artery Dimensions from Angiograms.
MASSACHUSETTS INST OF TECH CAMBRIDGE RESEARCH LAB OF ELECTRONICS
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A new approach is presented for the measurement of the severity of coronary obstructions from coronary angiograms. An angiogram is an x-ray picture of arteries in which a contrast agent has been injected. Existing techniques are heuristic and their performance is not satisfactory. The proposed approach exploits the characteristics of the signals involved. A model of the film density of the coronary angiograms is developed and used to estimate the diameter and cross-sectional area at each point along the vessel. The model accounts for the structure of the vessel and background, as well as the distortions introduced by the imaging system. Both a one-dimensional and a two-dimensional model of the angiogram are presented. The algorithms are tested on synthetic data, on x-rays of contrast-medium-filled cylindrical phantoms, and on real coronary angiograms. Both algorithms are shown to have better performance than current methods. Moreover, the two-dimensional algorithm is better than the one-dimensional algorithm.
- Medicine and Medical Research