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Proceedings Paper

Broadband Tomography System: Direct Time-Space Reconstruction Algorithm
Author(s): E. Biagi; L. Capineri; G. Castellini; L. Masotti; S. Rocchi
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Paper Abstract

In this paper a new ultrasound tomographic image algorithm is presented. A complete laboratory system is built up to test the algorithm in experimental conditions. The proposed system is based on a physical model consisting of a bidimensional distribution of single scattering elements. Multiple scattering is neglected, so Born approximation is assumed. This tomographic technique only requires two orthogonal scanning sections. For each rotational position of the object, data are collected by means of the complete data set method in transmission mode. After a numeric envelope detection, the received signals are back-projected in the space-domain through a scalar function. The reconstruction of each scattering element is accomplished by correlating the ultrasound time of flight and attenuation with the points' loci given by the possible positions of the scattering element. The points' locus is represented by an ellipse with the focuses located on the transmitter and receiver positions. In the image matrix the ellipses' contributions are coherently summed in the position of the scattering element. Computer simulations of cylindrical-shaped objects have pointed out the performances of the reconstruction algorithm. Preliminary experimental results show the laboratory system features. On the basis of these results an experimental procedure to test the confidence and repeatability of ultrasonic measurements on human carotid vessel is proposed.

Paper Details

Date Published: 18 October 1989
PDF: 6 pages
Proc. SPIE 1137, Science and Engineering of Medical Imaging, (18 October 1989); doi: 10.1117/12.961717
Show Author Affiliations
E. Biagi, Universita' degli Studi di Firenze (Italy)
L. Capineri, Universita' degli Studi di Firenze (Italy)
G. Castellini, Universita' degli Studi di Firenze (Italy)
L. Masotti, Universita' degli Studi di Firenze (Italy)
S. Rocchi, Universita' degli Studi di Firenze (Italy)


Published in SPIE Proceedings Vol. 1137:
Science and Engineering of Medical Imaging

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