[BIC-announce] FW: Seminar notice for Candidate Dr. Jeremy Brown

[Bruce Pike]

SEMINAR 

 

Design and Fabrication of High-Frequency Ultrasound Systems for Medical
Imaging
 
Dr. Jeremy Brown
Queen¹s University 
 
Monday, June 5th, 2006 at 11:00 am
Conference Room 603

 
 
The non-destructive nature of ultrasonic waves has made ultrasound imaging
one of the most popular diagnostic tools in medicine. Most commercial
ultrasound systems operate in the frequency range from 3 to 5 MHz and can
resolve structures approximately 1 mm in size. By increasing the frequency,
the ultrasound wavelength is decreased and finer resolution can be obtained.
Recently, several high frequency (30-100 MHz) ultrasound systems have been
developed for imaging the eye, skin, and vascular system with microscopic
resolution (< 100 microns). These systems are based on single-element
transducers that are geometrically shaped in order to focus the ultrasound
energy. Excellent resolution is obtained close to the geometric focus of
these transducers, but away from this region the beam spreads and image
resolution is degraded. A significant improvement in image quality can be
achieved by replacing the single-element transducer with a transducer array
and an electronic beamformer. This combination allows the ultrasound energy
to be optimally focused at each depth within the tissue. Unfortunately,
fabricating a high-frequency transducer array is difficult since the
dimensions of the array scale with the ultrasound wavelength. In addition,
the required sampling resolution of the electronic beamformer increases with
ultrasound frequency. This prohibits conventional signal processing
techniques from being implemented. In this talk, I will provide a brief
overview of high-frequency ultrasound imaging, describe my work in
developing the world¹s first high-frequency multi-element ultrasound system,
and discuss the future direction of my research in this field.
 

 
 
Deborah Davies
Administrative Assistant
Electrical & Computer Engineering
McGill University
Tel:  (514) 398-7111
Fax: (514) 398-4470
deborah.davies at mcgill.ca
 


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