Effect of spatial sampling on an acoustical image reconstruction
作者:
C. Bruneel,
E. Bridoux,
B. Delannoy,
B. Nongaillard,
J. M. Rouvaen,
R. Torguet,
期刊:
Journal of Applied Physics
(AIP Available online 1978)
卷期:
Volume 49,
issue 2
页码: 569-573
ISSN:0021-8979
年代: 1978
DOI:10.1063/1.324680
出版商: AIP
数据来源: AIP
摘要:
It is often difficult and unpractical, in the acoustic imaging area, to insert a focusing lens between the observed object and the ultrasonic receiver. Furthermore, the focal length must, in the B scan mode, be varied very fast in order to keep the line sources lying at different depths well focused. A spatial‐sampling scheme may be used for circumventing these problems by taking off the possibly complex processing unit from the element contacting the observed object, without additional complexity or degradation in the flexibility and usefulness of the apparatus. The sampling is done using a receiving transducer array to convert the acoustic signals into electrical ones, which may be amplified before being applied to another reemitting transducer array: an acoustical field identical to the original one is so reconstructed. The sampling operation will, however, alter the image quality by introducing parasitic images. The dependence of the perturbations upon the system parameters is studied in this paper and criteria are derived for limiting them.
点击下载:
PDF
(292KB)
返 回