A detection method of ground glass opacities in chest x-ray CT images using automatic clustering techniques

Mitsuhiro Tanino; Hotaka Takizawa; Shinji Yamamoto; Tohru Matsumoto; Yukio Tateno; Takeshi Iinuma

doi:10.1117/12.480294

15 May 2003 A detection method of ground glass opacities in chest x-ray CT images using automatic clustering techniques

Mitsuhiro Tanino, Hotaka Takizawa, Shinji Yamamoto, Tohru Matsumoto, Yukio Tateno, Takeshi Iinuma

Proceedings Volume 5032, Medical Imaging 2003: Image Processing; (2003) https://doi.org/10.1117/12.480294
Event: Medical Imaging 2003, 2003, San Diego, California, United States

Abstract

In this paper, we described an algorithm of automatic detection of Ground Glass Opacities (GGO) from X-ray CT images. In this algorithm, first, suspicious shadows are extracted by our Variable N-Quoit (VNQ) filter which is a type of Mathematical Morphology filters. This filter can detect abnormal shadows with high sensitivity. Next, the suspicious shadows are classified into a certain number of classes using feature values calculated from the suspicious shadows. In our traditional clustering method, a medical doctor has to manually classify the suspicious shadows into 5 clusters. The manual classification is very hard for the doctor. Thus, in this paper, we propose a new automatic clustering method which is based on a Principal Component (PC) theory. In this method, first, the detected shadows are classified into two sub-clusters according to their sizes. And then, each sub-cluster is further classified into two sub-sub-clusters according to PC Scores(PCS) calcuated from the feature values of the shadows in the sub-cluster. In this PCS-based classification, we use a threshold which maximizes the distance between the two sub-sub-clusters. The PCS-based classification is iterated recursively. Using discriminate functions based on Mahalanobis distance, the suspicious shadows are determined to be normal or abnormal. This method was examined by many samples (including GGO's shadows) of chest CT images, and proved to be very effective.

Citation Download Citation

Mitsuhiro Tanino, Hotaka Takizawa, Shinji Yamamoto, Tohru Matsumoto, Yukio Tateno, and Takeshi Iinuma "A detection method of ground glass opacities in chest x-ray CT images using automatic clustering techniques", Proc. SPIE 5032, Medical Imaging 2003: Image Processing, (15 May 2003); https://doi.org/10.1117/12.480294

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