Title :
P2D-9 A Frequency-Compensated Coded-Excitation Pulse to Improve Axial Resolution of Ultrasonic System
Author :
Barros, Alvaro Luiz Pereira ; Machado, Joao Carlos ; Costa-Felix, Rodrigo Pereira Barretto da
Author_Institution :
Biomed. Eng. Program, Fed. Univ. of Rio de Janeiro
Abstract :
This work presents a method for coded excitation of ultrasound system using a compensated frequency modulation based on the spectral response of the echo from a flat reflector. The method provides an improvement of the overall range resolution of the ultrasound system comprising the pulse generator, impedance matching networks, receive amplifier and transmit/receive transducer. The method was tested in terms of the range resolution for the echo from a flat reflector and with the transducer of the ultrasound system excited with a linear frequency modulated coded excitation and with the proposed compensated frequency modulation coded excitation. The received echo was compressed using the cross-correlation technique and the width of the compressed echo-pulse envelope was around 1.02 and 0.85 mus for linear frequency modulation and compensated frequency modulation coded excitations, respectively
Keywords :
acoustic signal processing; echo; frequency modulation; modulation coding; ultrasonics; cross-correlation technique; echo-pulse envelope; frequency modulation; frequency-compensated coded-excitation pulse; impedance matching networks; pulse generator; receive amplifier; transmit-receive transducer; ultrasonic system; ultrasound system; ultrasound transducer; Bandwidth; Chirp modulation; Frequency modulation; Frequency response; Impedance matching; Pulse amplifiers; Pulse generation; Pulse modulation; Ultrasonic imaging; Ultrasonic transducers;
Conference_Titel :
Ultrasonics Symposium, 2006. IEEE
Conference_Location :
Vancouver, BC
Print_ISBN :
1-4244-0201-8
Electronic_ISBN :
1051-0117
DOI :
10.1109/ULTSYM.2006.418
