Title :
Synthetic aperture focusing techniques applied in the near field of a focused transducer
Author :
Masri, W. ; Mina, M. ; Udpa, Satish S. ; Udpa, L. ; Xue, T. ; Lord, W.
Author_Institution :
Dept. of Electr. Eng. & Comput. Eng., Iowa State Univ., Ames, IA, USA
Abstract :
Synthetic aperture focusing techniques (SAFT) are used to improve the signal-to-noise ratio (SNR) of ultrasonic images. The effect of applying SAFT in the near-field of a focused transducer is studied. The variations in the near-field zone are derived analytically and used to modify the SAFT algorithm. SAFT is performed on both the RF data and the envelope of the signal. Experimental results demonstrating the effectiveness of the approach are presented
Keywords :
acoustic noise; ultrasonic focusing; ultrasonic imaging; ultrasonic transducers; RF data; SAFT algorithm; envelope; focused transducer; near-field zone; signal-to-noise ratio; synthetic aperture focusing techniques; ultrasonic images; Acoustic transducers; Circuits; Envelope detectors; Focusing; Geometry; Integral equations; RF signals; Radio frequency; Solids; Ultrasonic transducers;
Conference_Titel :
Ultrasonics Symposium, 1995. Proceedings., 1995 IEEE
Conference_Location :
Seattle, WA
Print_ISBN :
0-7803-2940-6
DOI :
10.1109/ULTSYM.1995.495683
