Towards ultrasonic brain imaging

Jean François Aubry, James Gerber, Mickaël Tanter, Jean Louis Thomas, Mathias Fink

Research output: Contribution to journalConference articlepeer-review


Ultrasonic imaging system capabilities are strongly dependent on the focusing quality of the ultrasonic beam. The beam width and sidelobe level constrain respectively the resolution and contrast of the final image. In the case of brain imaging, it is well-known that the skull strongly degrades the ultrasonic focusing pattern by introducing substantial phase and amplitude aberrations of the wavefront. In previous work, this degradation of the beam focus had been partially corrected by coupling the time reversal focusing process to an amplitude compensation of the emitted signals. In that case, the optimal focus was reproduced down to -20 dB, but the sidelobe level remained at about -25 dB. We propose here a new focusing technique based on the calculation of the spatio-temporal inverse filter of the propagation. Experimental focusing through the skull is now comparable to the focusing in a homogeneous medium. In the transmit-receive mode, focusing through the skull could reach the optimal level obtained in water down to -70 dB (i.e. constrained only by experimental noise levels.).

Original languageEnglish (US)
Pages (from-to)1623-1627
Number of pages5
JournalProceedings of the IEEE Ultrasonics Symposium
StatePublished - Dec 1 2000
Event2000 IEEE Ultrasonics Symposium - San Juan, Puerto Rico
Duration: Oct 22 2000Oct 25 2000


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