Title :
B-type imaging with coded signals
Author :
Gindre, M. ; Urbach, W.
fDate :
31 Oct-3 Nov 1993
Abstract :
We have used a pseudorandom (PN) coded signal to investigate the improvement of the signal to noise ratio (SNR) in B-type echography. With N≈103 bits of code the experimental value of SNR is about 55 dB for PN sequence, close to the theoretical value of 20 log N ≈60 dB. In order to assess the respective advantages of the classical echo images and those obtained with coded signal, we present some B-type images obtained from objects of elementary geometry with application to non destructive testing and medical imaging. We show that the SNR improvement obtained with PN sequence allows the observation of details which would remain invisible with classical echographic techniques
Keywords :
acoustic imaging; biomedical ultrasonics; echo; patient diagnosis; ultrasonic materials testing; ultrasonic reflection; 55 dB; B-type echography; B-type images; classical echo images; coded signal; medical imaging; nondestructive testing; pseudorandom coded signal; signal to noise ratio; Bandwidth; Biomedical imaging; Energy resolution; Frequency; Instruments; Medical diagnostic imaging; Medical tests; Phase modulation; Signal to noise ratio; Transducers;
Conference_Titel :
Ultrasonics Symposium, 1993. Proceedings., IEEE 1993
Conference_Location :
Baltimore, MD
Print_ISBN :
0-7803-2012-3
DOI :
10.1109/ULTSYM.1993.339624
