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英文誌(2004-)

Journal of Medical Ultrasonics

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1996 - Vol.23

Vol.23 No.10

Original Article(原著)

(0723 - 0730)

3次元LOGフィルタを用いた前立腺輪郭の自動抽出

Automated Boundary Extraction of the Prostate Using 3D Laplacian of Gaussian Filters

大橋 剛介1, 川崎 育代1, 秋山 いわき2, 中島 真人1

Gosuke OHASHI1, Ikuyo KAWASAKI1, Iwaki AKIYAMA2, Masato NAKAJIMA1

1慶應義塾大学理工学部電気工学科中島研究室, 2湘南工科大学工学部

1Department of Electrical Engineering, Keio University, 2Department of Electrical Engineering, Shonan Institute of Technology

キーワード : Boundary extraction, Echographic image, LOG filter, Prostate, Transabdominal data

We report an attempt to develop a highly accurate algorithm that can automatically extract the image of the prostate from echographic images. The method comprises three steps: first, a series of echographic images obtained by transabdominal scan provide three dimensional data on the prostate; second, a Laplacian of Gaussian (LOG) filter is applied to the echographic images to detect the boundary within the prostate region; last, the prostate region is extracted using prior knowledge. Because two-dimensional LOG filtering was not accurate enough to detect boundaries, we extended the LOG filter to three dimensions. Closed-curve surfaces found with boundary detection correspond to the target region but include incomplete and false surfaces as well. Prior knowledge is used to extract the true prostate region from these surfaces. This method extracted most of the prostate region automatically in some clinical cases.