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C.N.R.S. | | E.S.P.C.I. | L.O.A. | Paris VII Univ.
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Team "Waves Physic for Medicine"

Elastic Waves, Ultrasounds and Magnetic Resonance

E.P.O.M is a team of physicists working at the "Laboratoire Ondes et Acoustique (CNRS UMR 7587)" in the wave physics domain for medical imaging and therapy. Its first goal is to develop new techniques of imaging for medical diagnostic. These works are based on ultrasound, optic and magnetic resonnance methods.

New tools for prevention, diagnostic and therapy

Since few years we are developing new medical imaging and noninvasive therapy techniques using ultrasound. Regarding these applications, many original ultrasound electronic systems were builded to validate in vitro and then in vivo these new methods. Recently, the ESPCI purchase a 7 Tesla MRI system and get an access to a full body 1.5 Tesla MRI system corps which allowed us to investigate the connection between ultarsound waves, shear waves and magnetic resonance. At last, a strong collaboration was put in place with the C. Boccara team of the ESPCI's Laboratoire d'Optique Physique on subjects like: Opto-Acoustics and Acousto-Optics.

Ultrasound imaging and therapy of the brainUltrasound focusing through the skull is very complex due to distortion induce by the bone on propagating ultrasonic waves. After have proved that distortion can be corrected by time reversal techniques, the E.P.O.M. has developed the first prototype of noninvasive ultrasound brain therapy.

Elasticity imaging of the human body with remote palpation technique The main subject is to used a medical imaging technique of visocelastic properties of soft tissues to make the diagnosis of breast or liver cancer. We proposed the original idea of ultrasound ultrafast imaging (5000 Hz) and ultrasonic remote palpation. The displacements induce by the consequent propagating shear waves are mapped in quasi real time and gives informations on the local elasticity of tissues.

Multi-scale magnetic resonance imaging By comparison of the viscoelastic properties of tissues assessed with different non invasive medical imaging techniques (MRI ultrasound ), we want to understand the connection between viscoelastic properties at macroscopic and microscopic scale. This multiscale rheological study, from 7 Tesla MRI imaging system to ultrasound ultrafast imaging, will allows to understand the relevance of clinical parmaters such as elasticity, viscosity and shear anisotropy.

Imaging/Therapy system for cancer treatmentUltrasound therapy systems with monitoring are develop for cancer treatment of the abdomen organs (liver and kidneys). These systems are only designed for ultrasound. The probe, composed of hundreds of transducers are able to burn tissues at milimeter scales, image elasticity and temperature, and correct in real-time the undesirable organs motions.
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