Table 1 Properties and materials of each type of phantom in the simulations and experiments.
From: Small-window parametric imaging based on information entropy for ultrasound tissue characterization
Type no. | Objectives | Properties of the scatterers in the background | Additional scatterers or additive in the background | |
|---|---|---|---|---|
Simulations | Type-I | Simulating changes in the number density of scatterers | Point scatterers (RSC: 1) Number density of scatterers: 2, 4, 8, and 16 scatterers/mm2 | — |
Type-II | Simulating changes in the degree of variance in the echogenicity | Point scatterers (RSC: 1) Number density of scatterers: 16 scatterers/mm2 | Point scatterers (RSC: 2, 4, 6, and 8) Number density of scatterers: 1 scatterers/mm2 | |
Type-III | Simulating the tissue interface | Point scatterers (RSC: 1) Number density of scatterers: 16 scatterers/mm2 | An embedded cylindrical object with point scatterers (RSC: 0.1) Number density of scatterers: 16 scatterers/mm2 | |
Phantom experiments | Type-A | Simulating changes in the number density of scatterers | Glass beads Number density of scatterers: 2, 4, 8, and 16 scatterers/mm3 | — |
Type-B | Simulating changes in the degree of variance in the echogenicity | Graphite powder Scatterer concentration: 2 g in 200 mL water (>1000 scatterers/mm3) | Glass beads Scatterer concentration: 0.05, 0.1, and 0.3 g in 200 mL water | |
Type-C | Simulating the attenuation effect | Graphite powder Scatterer concentration: 2 g in 200 mL water (>1000 scatterers/mm3) | Soybean-oil lipid emulsions Lipid concentration: 0%, 5%, 10%, and 20% | |
Type-D | Simulating the tissue interface and exploring effects of frequency and focus | A tissue-mimicking breast phantom | — |
