Vessel Analysis: Tortuosity and AVR

L. Tramontan and A. Ruggeri. Computer estimation of the AVR parameter in diabetic retinopathy. WC 2009, IFMBE Proceedings 25/XI, pp. 141–44, Springer-Verlag, Berlin Heidelberg 2009.
E. Grisan, M. Foracchia, A. Ruggeri. A novel method for the automatic grading of retinal vessel tortuosity. IEEE Trans Med Imag 27(3):310-9, Mar 2008.

Tortuosity Measure

Tortuosity is among the first alterations in retinal vessel network to appear in many retinopathies. Automatic evaluation of retinal vessel tortuosity is thus a valuable tool for early detection of vascular suffering. We propose here a new algorithm for the evaluation of tortuosity in vessels extracted from digital fundus images. It is based on the partitioning of each vessel in segments of constant-sign curvature and on the combination between the number of such segments and their curvature values.

AVR Determination

Generalized arteriolar narrowing is an important sign of hypertension. It is expressed by AVR (Arteriolar-to-Venular diameter Ratio), which requires the long and subjective manual measurement of caliber in many arteries and veins.



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