Authors:
l. Castellanos
;
A. Ramos
and
H. Calás
Affiliation:
Instituto de Acústica - CSIC, Spain
Keyword(s):
Beam Collimation, Driving signals, X wave, Pressure field, Velocity potential.
Related
Ontology
Subjects/Areas/Topics:
Acoustic Signal Processing
;
Applications and Services
;
Biomedical Engineering
;
Biomedical Signal Processing
;
Computer Vision, Visualization and Computer Graphics
;
Education and Training
;
Medical Image Detection, Acquisition, Analysis and Processing
;
Simulation and Modeling
;
Simulation Tools and Platforms
Abstract:
An interesting approach for achieving high-resolution in ultrasonic imaging, is producing in real time limited diffraction waves with annular arrays; this potential option was presented by J.-Y. Lu in 1991 for collimating ultrasonic beams in medical imaging, approximating classical X waves with a finite aperture 10-annuli array, driven with 0-order X-wave excitation signal generated by solving the isotropic/homogeneous scalar wave equation. However, detailed solutions for a proper array electrical driving in order to form X-wave fields of both pressure and velocity potential have been not still reported. Paper objective is to show a tool to obtain approximated solutions for the inverse problems (aspect by-passed in classical approach) of synthesizing voltage excitations sets for producing both possible X wave field profiles, and comparatively investigate their distinct beam collimating capacities. All calculations, simulations and analyses were made for an ad-hoc developed 8-rings 2.
5 MHz array transducer. Results show field distributions in ultrasonic pressure, created for two driving approaches derived by our inverse processing from calculated pressure and velocity potential fields. The good performances resulting in both cases for beam collimation, confirm the tool applicability. Results suggest the viability of our procedure as a promising alternative to classical X-wave driving calculations.
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