Supersonic shear imaging (SSI) is a new ultrasound-based technique for real-time
visualization of soft tissue viscoelastic properties. Using ultrasonic focused beams, it is
possible to remotely generate mechanical vibration sources radiating low-frequency, shear …

Time reversal of ultrasonic fields represents a way to focus through an inhomogeneous
medium. This may be accomplished by a time-reversal mirror (TRM) made from an array of
transmit-receive transducers that respond linearly and allow the incident acoustic pressure …

An overview of time reversal techniques is presented in this paper. In the first section, we
focus on the ability of using reflecting targets embedded in the body as sources of time
reversal waves. Real time tracking and destruction of moving kidney stones are …

Section 1 is devoted to the description of time reversal cavities and mirrors together with a comparison
between time reversal and phase conjugation. To illustrate these concepts, several experiments
conducted in multiply scattering media, waveguides and chaotic cavities are presented in section …

In complex media such as white paint and biological tissue, light encounters nanoscale
refractive-index inhomogeneities that cause multiple scattering. Such scattering is usually
seen as an impediment to focusing and imaging. However, scientists have recently used …

This paper presents an initial clinical evaluation of in vivo elastography for breast lesion
imaging using the concept of supersonic shear imaging. This technique is based on the
combination of a radiation force induced in tissue by an ultrasonic beam and an ultrafast …

The emergence of ultrafast frame rates in ultrasonic imaging has been recently made
possible by the development of new imaging modalities such as transient elastography.
Data acquisition rates reaching more than thousands of images per second enable the real …

We present an approach for subwavelength focusing of microwaves using both a time-
reversal mirror placed in the far field and a random distribution of scatterers placed in the
near field of the focusing point. The far-field time-reversal mirror is used to build the time …

They can also be used for elegant experiments in pure physics. The magic of time-reversed
acoustics is possible because sound is composed of waves. When you speak you produce
vibrations in the air that travel like ripples on a pond spreading out from the point where a …

Elastography is a technique to assess the viscoelastic properties of tissue by measuring an
acoustic wave propagating though the object. Here, the technique is applied in the course of
standard MR mammography to 15 patients with different pathologies (six breast cancer …