Vibration response imaging (VRI™ for short) is based on the vibration response of a given structure to an acoustic excitation signal.

	Two sensor array units (V-Array) are placed on a patient's back to collect the vibration response,
	Airflow & turbulence in the large airways induce vibrations of the airway walls,
	Proprietary algorithm combines the output signals, filter & process it  to produce a sequence of images which reflect the vibration properties at each pixel position and at each interval,
	These vibrations are affected by the property of the airways & by the lung tissue,
	The VRIxp™ device passively records the vibration energy according to the vibration distribution,
	The vibration energy is processed to produce a dynamic & functional image of the lungs.

Vibration response imaging only receives and processes energy and does not emit waves or radiation to the body.