Table 1.

Classification of ultrasound elastography

Techniques	Measurements	Excitation	Methods	Indicators	Company	System
Strain imaging	Strain or displacement	Manual compression	Stain elastography	Elasticity score Strain ratio E/B size ratio	Esaote Hitachi Aloka GE Philips Toshiba Ultrasonix Mindray Samsung Siemens	ElaXto™ Real-time tissue elastography™ Elastography ElastoScan™ eSieTouch™ Elasticity imaging
Shear wave imaging	Shear wave speed	Mechanical vibration ARFI	Transient elastography p-SWE 2D SWE 3D SWE	Young’s modulus (kPa) Shear wave speed (m/s) Young’s modulus (kPa) Shear wave speed (m/s) Young’s modulus (kPa) Shear wave speed (m/s) Young’s modulus (kPa) SuperSonic Imagine	Echosens Siemens Philips Siemens SuperSonic Imagine	FibroScan™ VTQ ElastPQ™ VTIQ SWE™ SWE™

VTQ: Virtual Touch™ quantification; VTIQ: Virtual Touch™ image quantification; SWE: ShearWave™ elastography; ARFI: Acoustic radiation force impulse; p-SWE: Point-SWE