초음파 영상에서 LoG 연산자를 이용한 진단 객체의 3차원 분할

Abstract

This paper proposes a three- dimensional (3D) segmentation algoithm for extracting a diagnostic object from ultrasound images by using a LoG operator. In the proposed aigorithm, 2D cutting planes are first obtained by the equiangular revolution of a cross sectional plane on a reference axis for a 3D volume data. In each 2D ultrasound image, a region of interest (ROI) box that is included tightly in a diagnostic object of interest is set. Inside the ROI box. a LoG operator, where the value of is adaptively selected by the dlstance between reference points and the variance of the 2D image, extracts edges in the 2D image. In post processing, regions of the edge image are found out by region filling, small regions in the region filled image are removed, and the contour image of the object is obtained by morphological opening. Finally, a 3D volume of the diagnostic object is rendered from the set of contour images obtained by post-processing. Experimental results for a tumor and gall bladder volume data show that the proposed method yields on average two times reduction in error rate over Krivanek's method when the results obtained manually are used as a reference data.