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Table 2 Histological and videodensitometric parameters according clinical groups (mean ± sd).

From: Ultrasonic tissue characterization of vulnerable carotid plaque: correlation between videodensitometric method and histological examination

   I (15) II (10) p
Histological Parameters Fibromuscular tissue (%) 60,36 ± 5,410 75,86 ± 3,623 0,0445
  Lipid (%) 32,32 ± 4,705 19,57 ± 3,151 0,0560
  Calcification (%) 7,313 ± 1,990 4,578 ± 2,301 0,3835
Videodensitometric Parameters Mean Gray Level 0,389 ± 0,033 0,565 ± 0,0405 0,003
  Standard Deviation 3,774 ± 0,429 4,985 ± 0,399 0,063
  Entropy 5,66 ± 0,1036 5,580 ± 0,1371 0,618
  Energy 0,006 ± 0,0009 0,023 ± 0,008 0,025
  Homogeneity 0,201 ± 0,0115 0,233 ± 0,002 0,1689