Automated detection algorithm for arteriolar narrowing on fundus images.

Automated detection algorithm for arteriolar narrowing on fundus images. Research Abstract Details 

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Automated detection algorithm for arteriolar narrowing on fundus images. Abstract Text:

Yuji Hatanaka,Toshiaki Nakagawa,Akira Aoyama,Xiangrong Zhou,Takeshi Hara,Hiroshi Fujita,Masakatsu Kakogawa,Yoshinori Hayashi,Yutaka Mizukusa,Akihiro Fujita,

We have developed a computer-aided diagnosis system (CAD) to detect abnormalities in fundus images. In Japan, ophthalmologists usually detect hypertensive changes by identifying arteriolar narrowing and focal arteriolar narrowing. The purpose of this study is to develop an automated method for detecting arteriolar narrowing and focal arteriolar narrowing on fundus images. The blood vessel candidates were detected by the density analysis method. In blood vessel tracking, a local detection function was used to determine the centerline of the blood vessel. A direction comparison function using three vectors was designed to optimally estimate the next possible location of a blood vessel. After the connectivity of vessel segments was adjusted based on the recognized intersections, the true tree-like structure of the blood vessels was established. The blood vessels were recognized as arteries or veins by hue of HSV color space and their diameters. The arteriolar narrowing was detected by the ratio of diameters (artery vs. vein; A/V ratio). Focal arteriolar narrowing was detected by measuring the diameter of an artery. By applying this method to 100 fundus images, the detection sensitivity for arteriolar narrowing was found to be 76% when the specificity was 91%. Furthermore, by applying this method to 70 other different fundus images, the detection sensitivity for the focal arteriolar narrowing was 75% with 2.9 false positives per image. The number of some false positives is planned to be reduced during the next stage of development. Such an automated detection of abnormal vessels could help ophthalmologists in diagnosing ocular diseases.

Automated detection algorithm for arteriolar narrowing on fundus images. Publishing Authors By Initials

Y Hatanaka,T Nakagawa,A Aoyama,X Zhou,T Hara,H Fujita,M Kakogawa,Y Hayashi,Y Mizukusa,A Fujita,

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Automated detection algorithm for arteriolar narrowing on fundus images. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Conference proceedings : ... Annual International

VOLUME: 1

Page Numbers: 286-9

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ISSN: 1557-170X

DAY: 6

MONTH: 02

YEAR: 2005

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LANGUAGE: eng

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AFFILIATION: Department of Electric Control Engineering, Gifu National College of Technology, Kamimakuwa 2236-2, Motosu 501-0495, Japan (phone: 81-58-320-1384; fax: 81-58-320-1384; e-mail: hatanaka@gifu-nct.ac.jp).

Country: United States

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