Design of a High Frequency Equal Width Annular Array Transducer for Medical Imaging
نویسندگان
چکیده
This work investigates a strongly-focused annular array for high frequency ultrasonic applications, offering improved resolution without increasing the operating frequency, potentially reducing the complexity of manufacture. However, the conventional geometry, specifically the Equal Area array exhibits a problem with high sidelobes. A method based on geometric change is developed to control the lobe and leads to the design of an Equal Width annular array. This array successfully controls the sidelobe, and maintains the resolution improvement offered by stronglyfocused arrays.
منابع مشابه
Design of a Novel High Frequency Ultrasound Annular Array
The design of a novel 50MHz 7-elment annular array is described. Equal-width electrodes are deposited on the rear face of piezoelectric layer to form a kerfless array, instead of mechanical cutting. Compared with equal-area designs, much better performance is achieved by the novel design. The cross talk is down to -20dB, the -6dB bandwidth and insertion loss are 41% and 18dB, respectively. The ...
متن کاملApproximation of Bessel Beams with Annular Arrays
1 Abstract — It is shown that the limited-diffraction Bessel beam of order zero can be generated by a transducer with equal-area division of elements and with a fixed prefocus, i.e. conventional transducers used in medical imaging equipment. The element division implies that the scaling parameter must be chosen to contain the first lobe of the Bessel function in the first element. In addition t...
متن کاملHigh Frequency Piezo-Composite Transducer Array Designed For Ultrasound Scanning Applications
A 20 MHz high density linear array transducer is presented in this paper. This array has been developed using an optimized ceramicpolymer composite material. The electro-mechanical behaviour of this composite, especially designed for high frequency applications , is characterised and the results are compared to theoretical predictions . To support this project, a new method of transducer simula...
متن کاملFabrication and characterization of annular-array, high-frequency, ultrasonic transducers based on PZT thick film
In this work, low temperature deposition of ceramics, in combination with micromachining techniques have been used to fabricate a kerfed, annular–array, high–frequency, micro ultrasonic transducer (with seven elements). This transducer was based on PZT thick film and operated in thickness mode. The 27 μm thick PZT film was fabricated using a low temperature (720 oC) composite sol-gel ceramic (s...
متن کاملB-Mode Photoacoustic Imaging using Linear Array: Numerical Study for Forward-Backward Minimum Variance Beamformer Combined with Delay-Multiply-and-Sum
Photoacoustic imaging (PAI) is a promising medical imaging modality which provides the resolution of Ultrasound (US) and the contrast of Optical imaging modalities. One of the most important challenges in PAI is image formation, especially in the case that a linear-array US transducer is used for data acquisition. This is due to the fact that in the linear-array scenario, there is only 60 degre...
متن کامل