Systematic Analysis Of The Grating Lobe Of Ultrasonographic Array Directivity

P.J.'t Hoen

doi:10.1117/12.934604

1 November 1982 Systematic Analysis Of The Grating Lobe Of Ultrasonographic Array Directivity

P.J.'t Hoen

Proceedings Volume 0375, Medical Imaging and Image Interpretation; (1982) https://doi.org/10.1117/12.934604
Event: 1st International Symposium on Medical Imaging and Image Interpretation, 1982, Berlin, Germany

Abstract

In ultrasonography, arrays of small elements are used to build up a real-time sonographic image of the human anatomy. The element spacing is the main factor governing the position and intensity of the grating lobes. A grating lobe is a spurious lobe of the directivity function of the array. Image resolution and image interpretation are negatively influenced by such grating lobes. For continuous wave excitation, extensive literature exists for the grating lobe phenomenon. We, however, shal investigate the practical situation, i.e., a short acoustical pulse is emitted. The influence of element-spacing, slit-width, focal-length, apodization, etc. will be analyzed. A special FORTRAN program has been written to calc-ulate the directivity function. The computed results are backed up by some experiments.

Citation Download Citation

P.J.'t Hoen "Systematic Analysis Of The Grating Lobe Of Ultrasonographic Array Directivity", Proc. SPIE 0375, Medical Imaging and Image Interpretation, (1 November 1982); https://doi.org/10.1117/12.934604

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