Research Article

Despeckle Filtering for Multiscale Amplitude-Modulation Frequency-Modulation (AM-FM) Texture Analysis of Ultrasound Images of the Intima-Media Complex

Table 3

Statistical analysis between the low, medium and high AM-FM features extracted from the IMC for the automated segmentation measurements for the three different age groups, below 50 (<50), between 50 and 60 (50–60), and above 60 (>60) years old based on the Mann-Whitney rank sum test for all despeckle filtering techniques. Only the features that exhibited statistical significant differences at P < 0.05 are shown.

Filter nameAge groups50–60>60ScoreTable 2 ranking

Original (see also) [8]<50MIA37th
50–60LIA/HIF

DsFlsmv<50MIA/HIFMIA/LIF58th
50–60MIF (0.4)

DsFwiener<50MIA/HIAMIA/HIA/MIF/HIF/LIA79th
50–60

DsFKuhawara<50LIAMIA/LIF/HIF62nd
50–60LIA/MIF

DsFlsminsc<50LIA/HIFHIF54th
50–60LIA/MIA

DsFmedian<50MIA/LIF/HIF46th
50–60LIA

DsFhybridmedian<50LIAMIA/LIF/HIF71st
50–60LIA/LIF/MIF

DsFnldif<50LIA/MIA/LIFMIA/HIA93rd
50–60LIA/MIA/HIA/HIF

DsFsrad<50LIA/HIFMIA/LIF75th
50–60LIA/MIA/HIA

LIA, MIA, HIA: Low, Medium, High instantaneous amplitude. LIF, MIF, HIF: Low, medium, high instantaneous frequency, Score: Illustrates the numbers of significantly different features.