Simulation of circular array ultrasound transducers for intravascular applications

The beam shape of a circular array transducer that is commonly used in intravascular ultrasound catheters was investigated in linear mode of operation. For this use, a simulation program which can simulate the radio frequency (rf)-response of a number of scatterers has been developed. The program is...

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Bibliographic Details
Published in:The Journal of the Acoustical Society of America 2000-08, Vol.108 (2), p.827-835
Main Authors: Borsboom, J M, Céspedes, E I, van der Steen, A F, Lancée, C T, Deprettere, E F
Format: Article
Language:English
Subjects:
Coronary Vessels - physiology
Humans
Models, Biological
Transducers
Ultrasonics
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Summary:The beam shape of a circular array transducer that is commonly used in intravascular ultrasound catheters was investigated in linear mode of operation. For this use, a simulation program which can simulate the radio frequency (rf)-response of a number of scatterers has been developed. The program is based on the impulse response method, which is implemented in the frequency domain. Due to the unusual geometry of the transducer, the far field gets peculiarly shaped for large apertures. Instead of having a far field with its maximum intensity in a single lobe on the acoustical axis, the far field splits up into a dual-lobe far field with maximum intensity in two lobes off the acoustical axis. A formula is derived that predicts the occurrence of these beam shapes.
ISSN:0001-4966
1520-8524
DOI:10.1121/1.429616