TABLE 3.

Terminology Proposed by European Federation of Societies for Ultrasound in Medicine and Biology (EFSUMB) to Describe Ultrasound-Based Dynamic Elastography Techniques

Term	Definition
1D transient elastography	Refers to methods that use a single-element ultrasound transducer to track shear waves generated externally by a vibrating probe placed on the body surface. The prototype is FibroScan developed by Echosens [17]. This is a stand-alone device without anatomic imaging capability. Some investigators refer to it as vibration-controlled transient elastography (VCTE).
Point shear-wave elastography	Refers to methods that measure shear-wave speed (or derived stiffness-related parameter) in a user-defined small ROI. Although a parametric map is not generated, the location of the ROI is captured on a conventional B-mode image. The prototype is Virtual Touch Quantification, using acoustic radiation force impulse technology commercialized by Siemens Healthcare [12].
Shear-wave elastography	Refers to methods that generate quantitative parametric maps displaying the shear-wave speed (or derived stiffness-related parameter). The prototype is Supersonic Shear Imaging developed by SuperSonic Imagine [34].