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Paper Information

Title: 

RESOLUTION IMPROVEMENT OF ULTRASONIC MICROSCOPY IMAGING USING SPARSE SIGNAL REPRESENTATION

Type: PAPER
Author(s): MOHAMMADI R.,MAHLOOJIFAR A.,ZAYYANI H.
 
 
 
Name of Seminar: IRANIAN CONFERENCE ON BIOMEDICAL ENGINEERING
Type of Seminar:  CONFERENCE
Sponsor:  ANJOMANE MOHANDESI PEZESHKI IRAN
Date:  2008Volume 14
 
 
Abstract: 

ULTRASONIC MICROSCOPE OR SCANNING ACOUSTIC MICROSCOPE (SAM) IS A POWERFUL TOOL FOR BIOLOGICAL TISSUE CHARACTERIZATION. CHARACTERIZATION OF THIN SLICED TISSUE IS DIFFICULT, AS THE REFLECTED SIGNALS FROM TISSUE TOP AND BOTTOM ARE SUPERIMPOSED. TO DETERMINE THIN TISSUES HAVING MICROMETER THICKNESSES, HIGH ACOUSTIC FREQUENCIES ARE REQUIRED FOR CONVENTIONAL SAM SYSTEMS. THE ACOUSTIC FREQUENCY USED IN PRACTICE IS LIMITED BY ITS PENETRATION DEPTH THROUGH THE TISSUE. IN THIS PAPER, IN ORDER TO IMPROVE THE AXIAL RESOLUTION OF CONVENTIONAL SCANNING ACOUSTIC MICROSCOPY, A NEW SAM TECHNIQUE BASED ON SPARSE SIGNAL REPRESENTATION IN OVER COMPLETE TIME-FREQUENCY DICTIONARIES IS INVESTIGATED AND AMONG GREAT NUMBER OF ALGORITHMS FOR FINDING SPARSE REPRESENTATION OF SIGNAL, WE APPLY MP AND OMP ALGORITHMS. DIFFERENT CRITERIA ARE USED FOR MEASURING THIS TECHNIQUE PERFORMANCE FOR VARIOUS SAM APPLICATIONS, SUCH AS WAVEFORM ESTIMATION, ECHO DETECTION AND C-SCAN IMAGING. SIMULATION RESULTS SHOW THAT THIS METHOD HAS HIGHER RESOLUTION COMPARING WITH CONVENTIONAL SAM METHODS.

 
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