Table 1.
Classification of elasticity imaging methods according to operating frequency and source of stress
| Operating frequency | Stress source | Imaging parameter | Imaging method |
|---|---|---|---|
| Less than 5 Hz | Manual palpation | Strain | Strain imaging |
| Sine wave less than 500 Hz | Mechanical vibration | Shear modulus | Sonoelastography |
| Acoustical oscillating radiation force | Nonlinearity (resonance frequency) | Vibro-acoustography | |
| Impulse | Mechanical impulse | Shear modulus | Transient elastography |
| Acoustical radiation force impulse | Maximum displacement | ARFI imaging | |
| Shear modulus | Supersonic imaging |