Reconstruction of the Left Ventricle from Two Orthogonal Projection,
PITTSBURGH UNIV PA CENTER FOR MULTIVARIATE ANALYSIS
Pagination or Media Count:
A method for reconstruction of the shape of the left ventricle from the biplane angiocardiograms is proposed. This approach utilizes a pair of orthogonal X-ray projection images. The shape of the ventricle is reconstructed by dividing these projection images into parallel slices and then being processed slice by slice stepwise. Each corresponding pair of slices form two one-dimensional projection profiles which are used to reconstruct a cross section of the ventricle. Without using defined models, we proposed a new method to reconstruct the cross section under the assumption that the cross section is regular along the directions of projections and a monotonically nondecreasing or nonincreasing equal-divisor curve is available. A cross section is regular if it contains only one closed interval within the cross section along each ray of projection. We have proved that the cross section can be optimally reconstructed by minimizing an error index which is generated by the sum of the absolute difference between original and estimated projection profiles. The algorithm has been tested on synthetic and X-ray pictures with better than 95 conformity for regular cross sections. The experiments show better results than any existing direct methods since it is based on a more flexible geometrical assumption. It also prevents the sensitive selection of mask model which dominates the results of model-based methods. Thus, the algorithm is reliable, and more generally fits real shapes of the ventricle. Keywords Cardiovascular diseases ventricular volume measurement.
- Medicine and Medical Research
- Theoretical Mathematics