Patent ID: 7457447
Filing Date: 2008-11-25
Classification: G06T

Abstract:
1. A method of identifying colon polyps in a digital volume, wherein said volume comprises a plurality of values corresponding to a domain of points in a 3D space, said method comprising the steps of: selecting a mother wavelet scaling function that corresponds to a polyp; calculating a first derivative of said volume and selecting the mother wavelet function to be similar to a first derivative of a polyp; performing a forward wavelet transformation on said volume to obtain a set of wavelet coefficients, wherein each wavelet coefficient is associated with a length scale; determining for each length scale, a transformation magnitude, wherein the transformation magnitude comprises a threshold magnitude; forming, for each length scale, a transformed set of wavelet coefficients associated with said length scale, wherein said forming comprises selecting, for each length scale, those wavelet coefficients whose magnitudes exceeds the threshold for said length scale, to form a subset of wavelet coefficients associated with said length scale; performing, for each length scale, an inverse wavelet transform on the transformed wavelet coefficients corresponding to said length scale, to obtain a reconstructed volume, wherein said performing an inverse wavelet transform is performed on said coefficient subset for said length scale; and analyzing said reconstructed volume for the existence of polyps.