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Proceedings Article

ROI extraction of chest CT images using adaptive opening filter

[+] Author Affiliations
Nobuhiro Yamada, Mitsuru Kubo, Yoshiki Kawata, Noboru Niki

Univ. of Tokushima (Japan)

Kenji Eguchi

Tokai Univ. (Japan)

Hironobu Omatsu, Ryutaro Kakinuma

National Cancer Ctr. Hospital East (Japan)

Masahiro Kaneko, Masahiko Kusumoto, Noriyuki Moriyama

National Cancer Ctr. Hospital (Japan)

Hiroyuki Nishiyama

Social Health Insurance Medical Ctr. (Japan)

Proc. SPIE 5032, Medical Imaging 2003: Image Processing, 869 (May 16, 2003); doi:10.1117/12.483540
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From Conference Volume 5032

  • Medical Imaging 2003: Image Processing
  • Milan Sonka; J. Michael Fitzpatrick
  • San Diego, CA | February 15, 2003

abstract

We have already developed a prototype of computer-aided diagnosis (CAD) system that can automatically detect suspicious shadows from Chest CT images. But the CAD system cannot detect Ground-Grass-Attenuation perfectly. In many cases, this reason depends on the inaccurate extraction of the region of interests (ROI) that CAD system analyzes, so we need to improve it. In this paper, we propose a method of an accurate extraction of the ROI, and compare proposed method to ordinary method that have used in CAD system. Proposed Method is performed by application of the three steps. Firstly we extract lung area using threshold. Secondly we remove the slowly varying bias field using flexible Opening Filter. This Opening Filter is calculated by the combination of the ordinary opening value and the distribution which CT value and contrast follow. Finally we extract Region of Interest using fuzzy clustering. When we applied proposal method to Chest CT images, we got a good result in which ordinary method cannot achieve. In this study we used the Helical CT images that are obtained under the following measurement: 10mm beam width; 20mm/sec table speed; 120kV tube voltage; 50mA tube current; 10mm reconstruction interval.

© (2003) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.
Citation

Nobuhiro Yamada ; Mitsuru Kubo ; Yoshiki Kawata ; Noboru Niki ; Kenji Eguchi, et al.
"ROI extraction of chest CT images using adaptive opening filter", Proc. SPIE 5032, Medical Imaging 2003: Image Processing, 869 (May 16, 2003); doi:10.1117/12.483540; http://dx.doi.org/10.1117/12.483540


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