. Author manuscript; available in PMC: 2009 Jan 26.

Published in final edited form as: Conf Proc IEEE Eng Med Biol Soc. 2008;1:3134–3137. doi: 10.1109/IEMBS.2008.4649868

TABLE I.

Possible orientation patterns based on the value of eigenvalues λ₁, λ₂ (H=high, L=low, |λ₁| ≥ |λ₂|) [14].

λ₁	λ₂	orientation pattern
L	L	Flat or Noise no preferred direction
H−	L	Bright tubular structure
H+	L	Dark tubular structure
H−	H−	Bright blob-like structure
H+	H+	Dark blob-like structure