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Circle-like foreign element detection in chest x-rays using normalized cross-correlation and unsupervised clustering.

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Zohora F, Antani SK, Santosh KC
Proc SPIE 10574, Medical Imaging 2018: Image Processing, 105741V (2 March 2018); pp. doi: 10.1117/12.2293739
Abstract: 

Presence of foreign objects (buttons, medical devices) adversely impact the performance of the automated chest X-ray (CXR) screening. We present a novel image processing and machine learning technique to detect circle-like foreign elements in CXR images that helps avoid confusions in automated detection of abnormalities, such as nodules and other calcifications. In our technique, we apply normalized cross-correlation using a few templates to collect potential circle-like elements and unsupervised clustering to make a decision. We validated our fully automatic technique on a set of 400 publicly available images hosted by LHNCBC, U.S. National Library of Medicine (NLM), National Institutes of Health (NIH). Our method achieved an accuracy greater than 90% and outperforms existing techniques that are reported in the literature.

Zohora F, Antani SK, Santosh KC. Circle-like foreign element detection in chest x-rays using normalized cross-correlation and unsupervised clustering. Proc SPIE 10574, Medical Imaging 2018: Image Processing, 105741V (2 March 2018); pp. doi: 10.1117/12.2293739