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Applied Math Seminar
New perspectives in Ultrasonic Imaging and Time reversal Processing :
applications to Medical Imaging and Therapy
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In the first part of this lecture, I will described new ultrafast ultrasonic imaging techniques based on time reversal processing. We have developed an ultra high-rate ultrasonic scanner that can give 10.000 ultrasonic images per second of the body. With such a high frame-rate we can follow in real time the propagation of low frequency shear waves inside the body, and from the spatio-temporal evolution of the displacement fields, we can recover the shear modulus map by using local inversion algorithm. This technique combined with the use of radiation pressure to create high intensity shear sources allows Shear Imaging with a spatial resolution that is no more limited by diffraction considerations. In the second part of this talk, I will described several applications of time reversal techniques in the field of Imaging and Therapy. They concerns as well microcalcifications detection in breast, brain therapy through the skull and lithotripsy with time reversal resonators. |