Neil Chapman

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A semi-automatic method to measure and quantify geometrical and topological properties of continuous vascular trees in clinical fundus images is described. Measurements are made from binary images obtained with a previously described segmentation process. The skeletons of the segmented trees are produced by thinning,ff branch and crossing points are(More)
A computerised system is presented for the automatic quantification of blood vessel topography in retinal images. This system utilises digital image processing techniques to provide more reliable and comprehensive information for the retinal vascular network. It applies strategies and algorithms for measuring vascular trees and includes methods for locating(More)
Accurate measurement of vessel diameters on retinal images plays an important part in diagnosing cardiovascular diseases. In this study, a method of vessel diameter measurement has been developed incorporating with a tracking technique. Twin Gaussian functions are introduced to model the distribution of grey level profile over a vessel cross section. The(More)
OBJECTIVE To asses whether Angiotensin-converting enzyme inhibitors (ACEIs) and angiotensin receptor blockers (ARBs) are underused in patients with aortic disease due to concerns regarding flow limiting (>70%) renal artery stenosis (RAS). DESIGN A prospective analysis of patients admitted for aortic surgery was performed (January-July 2009). Co-morbidity,(More)
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