ImPhys colloquium | Stefan Catheline

Title:  Unveiling tissue secret using natural body vibrations

Elastography, sometimes referred as seismology of the human body, is an imaging modality now implemented on medical ultrasound systems, on MRI scanners and recently in optical coherence tomography devices. It allows to measure the shear wave speed in soft tissues and gives a tomography reconstruction of the shear elasticity. The shear elasticity being the elasticity felt by fingers during palpation, elastography is thus a palpation tomography. In the first part of this presentation, a passive elastography method is described. Inspired by noise correlation seismology and time reversal, it allows to extract from natural shear waves produced in the human body by heart beatings, muscles activities, arterial pulsations, a shear wave speed estimation. Therefore, an elasticity palpation mapping with no shear wave source is conducted. Latest developments in ultrasounds, MRI and optics will be discussed

Bio:
Stefan Catheline received his PhD degree in physics (1998) from University of Paris VII (Denis Diderot) for his work on ultrasound transient elastography. His research interests include medical ultrasound, underwater acoustics, wave physics, and seismology. He holds 12 patents in the field of ultrasound and seismology and wrote more than 100 research articles. He is co-founder of two companies: Sensitive Object in the field of acoustic interactivity and SEISME in the field of elastography. He works now as INSERM research director at LabTAU, University of Lyon, France.