Time reversal kaleidoscope: A smart transducer for three-dimensional ultrasonic imaging

Montaldo, Gabriel; Palacio, Delphine; Tanter, Mickael; Fink, Mathias
May 2004
Applied Physics Letters;5/10/2004, Vol. 84 Issue 19, p3879
Academic Journal
The design of two dimensional (2D) arrays for three dimensional (3D) ultrasonic imaging is a major challenge in medical and nondestructive applications. Thousands of transducers are typically needed for beam focusing and steering in 3D volumes. Here, we report a promising approach for producing 3D images with a small number of transducers using the combined concepts of time reversal mirrors and chaotic reverberating cavities. Due to multiple reverberations inside the cavity, a "kaleidoscopic" transducer array is created with thousands of virtual transducers equivalent to 2D matrices. Beyond the scope of 3D medical imaging, this work leads to the concept of "smart" transducer.


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