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IEICE Transactions on Information and Systems 2006 E89-D(1):340-350; doi:10.1093/ietisy/e89-d.1.340
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Copyright © 2006 The Institute of Electronics, Information and Communication Engineers

Regular Section -- Papers -- Biological Engineering

Computer-Aided Diagnosis of Intracranial Aneurysms in MRA Images with Case-Based Reasoning

Syoji KOBASHI1, Katsuya KONDO1 and Yutaka HATA1

1 The authors are with University of Hyogo, Himeji-shi, 671–2280 Japan. E-mail: kobashi{at}eng.u-hyogo.ac.jp

Finding intracranial aneurysms plays a key role in preventing serious cerebral diseases such as subarachnoid hemorrhage. For detection of aneurysms, magnetic resonance angiography (MRA) can provide detailed images of arteries non-invasively. However, because over 100 MRA images per subject are required to cover the entire cerebrum, image diagnosis using MRA is very time-consuming and labor-intensive. This article presents a computer-aided diagnosis (CAD) system for finding aneurysms with MRA images. The principal components are identification of aneurysm candidates (= ROIs; regions of interest) from MRA images and estimation of a fuzzy degree for each aneurysm candidate based on a case-based reasoning (CBR). The fuzzy degree indicates whether a candidate is true aneurysm. Our system presents users with a limited number of ROIs that have been sorted in order of fuzzy degree. Thus, this system can decrease the time and the labor required for detecting aneurysms. Experimental results using phantoms indicate that the system can detect all aneurysms at branches of arteries and all saccular aneurysms produced by dilation of a straight artery in 1 direction perpendicular to the principal axis. In a clinical evaluation, performance in finding aneurysms and estimating the fuzzy degree was examined by applying the system to 16 subjects with a total of 19 aneurysms. The experimental results indicate that this CAD system detected all aneurysms except a fusiform aneurysm, and gave high fuzzy degrees and high priorities for the detected aneurysms.

Key Words: intracranial aneurysm, magnetic resonance angiography, case-based reasoning, computer-aided diagnosis, fuzzy logic

Manuscript received February 24, 2005. Manuscript revised July 6, 2005.


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