Design of efficient, broadband single-element (20-80 MHz) ultrasonic transducers for medical imaging applications

Cannata, J.M.; Ritter, Timothy; Chen, Wo‐Hsing; Silverman, Ronald H.; Shung, K. Kirk

doi:10.1109/tuffc.2003.1251138

Cited by 311 publications

(189 citation statements)

References 21 publications

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“…In these experiments, a mechanical sector scanner capable of scanning at the rate of up to 130 frames per second was used [8]. The scanner mechanically translates a 40-MHz light-weigh single element transducer of which the focal depth is 8 mm and the f-number is 2.5 [19].…”

Section: Resultsmentioning

confidence: 99%

High-speed digital scan converter for high-frequency ultrasound sector scanners

2008

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This paper presents a high-speed digital scan converter (DSC) capable of providing more than 400 images per second, which is necessary to examine the activities of the mouse heart whose rate is 5-10 beats per second. To achieve the desired high-speed performance in cost-effective manner, the DSC developed adopts a linear interpolation algorithm in which two nearest samples to each object pixel of a monitor are selected and only angular interpolation is performed. Through computer simulation with the Field II program, its accuracy was investigated by comparing it to that of bilinear interpolation known as the best algorithm in terms of accuracy and processing speed. The simulation results show that the linear interpolation algorithm is capable of providing an acceptable image quality, which means that the difference of the root mean square error (RMSE) values of the linear and bilinear interpolation algorithms is below 1 %, if the sample rate of the envelope samples is at least four times higher than the Nyquist rate for the baseband component of echo signals. The designed DSC was implemented with a single FPGA (Stratix EP1S60F1020C6, Altera Corporation, San Jose, CA) on a DSC board that is a part of a high-speed ultrasound imaging system developed. The temporal and spatial resolutions of the implemented DSC were evaluated by examining its maximum processing time with a time stamp indicating when an image is completely formed and wire phantom testing, respectively. The experimental results show that the implemented DSC is capable of providing images at the rate of 400 images per second with negligible processing error.

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Section: Resultsmentioning

confidence: 99%

High-speed digital scan converter for high-frequency ultrasound sector scanners

2008

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“…The GRIN lens' pitch and its distance to the optical fiber were determined based on a ZEMAX simulation to achieve the optical working distance (6.5 mm in water) that we desired. The transducer was fabricated by press-focusing [60], which enables acoustic focusing without the acoustic signal loss that typically occurs in lens-based acoustic focusing [38], and it has a lithium niobate-based piezo-electric element with an aperture of 2.6 mm and a central hole diameter of 0.9 mm. To minimize the area loss of the piezo-electric element caused by the placement of the large diameter (1.2 mm) optical fiber and GRIN lens unit, it was necessary to recess the optical illumination unit by 2.1 mm.…”

Section: Design and Construction Of The Or-paem Probe And Peripheralmentioning

confidence: 99%

Label-free optical-resolution photoacoustic endomicroscopy in vivo

Yang

Chen

et al. 2015

SPIE Proceedings

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Intravital microscopy techniques have become increasingly important in biomedical research because they can provide unique microscopic views of various biological or disease developmental processes in situ. Here we present an opticalresolution photoacoustic endomicroscopy (OR-PAEM) system that visualizes internal organs with a much finer resolution than conventional acoustic-resolution photoacoustic endoscopy systems. By combining gradient index (GRIN) lens-based optical focusing and ultrasonic ring transducer-based acoustic focusing, we achieved a transverse resolution as fine as ~10 μm at an optical working distance of 6.5 mm. The OR-PAEM system's high-resolution intravital imaging capability is demonstrated through animal experiments.

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“…makes it a promising alternative to electromagnetic wave communication. Therefore, ultrasound is commonly used in medical imaging and underwater communication [1]. Most of the available ultrasound transducers are based on a single element piezoelectric material producing a piston shaped actuation, although single crystal piezoelectric materials by means of array structure are utilized in medical imaging [2].…”

Section: Introductionmentioning

confidence: 99%

Single-Element Omnidirectional Piezoelectric Ultrasound Transducer for under Water Communication

Sadeghpour

Meyers

Kruth

et al. 2017

Proceedings of Eurosensors 2017, Paris, France, 3–6 September 2017

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This paper presents the design and fabrication procedure of a single-element omnidirectional piezoelectric ultrasound transducer, which can be utilized for under water communication. The transducer consists of a spherical silicon infiltrated silicon carbide (Si-SiC) body and is able to perform communication at 160 kHz with a Q factor of about 5.6 over a distance of more than one meter. The circumferential pressure amplitude of the beam pattern of the transducer varies less than 10 dB, which allows reliable communication between different transducers at an arbitrary orientation with respect to each other.

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Design of efficient, broadband single-element (20-80 MHz) ultrasonic transducers for medical imaging applications

Cited by 311 publications

References 21 publications

High-speed digital scan converter for high-frequency ultrasound sector scanners

High-speed digital scan converter for high-frequency ultrasound sector scanners

Label-free optical-resolution photoacoustic endomicroscopy in vivo

Single-Element Omnidirectional Piezoelectric Ultrasound Transducer for under Water Communication

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