NDLI: Dual-frequency ultrasound imaging and therapeutic bilaminar array using frequency selective isolation layer

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IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control - Front cover

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IEEE Ultrasonics, Ferroelectrics, and Frequency Control Society - Elected Administrative Committee

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Electromagnetic-acoustic high-Q silicon resonators for liquid phase sensing

2-D green's functions for semi-infinite orthotropic piezothermoelastic plane

Stability variances: a filter approach

Characterization of doped BST thin films deposited by sol-gel for tunable microwave devices

Cryogenic sapphire oscillator using a low- vibration design pulse-tube cryocooler: first results

Segmented motion compensation for complementary coded ultrasonic imaging

Three-dimensional synthetic aperture focusing using a rocking convex array transducer

A new method for blood velocity measurements using ultrasound FMCW signals

Demonstration of second-harmonic IVUS feasibility with focused broadband miniature transducers

Interstitial thermal ablation with a fast rotating dual-mode transducer

Eigen-based clutter filter design for ultrasound color flow imaging: a review

Intima-media thickness: setting a standard for a completely automated method of ultrasound measurement

Laser ultrasonic inspection of plates using zero-group velocity lamb modes

Ultrasonic viscosity measurement using the shear-wave reflection coefficient with a novel signal processing technique

Vibration characteristics of besocke-style scanning systems

Frequency spectra of AT-cut quartz plates with electrodes of unequal thickness

Noncontact ultrasonic transportation of small objects over long distances in air using a bending vibrator and a reflector

A new traveling wave ultrasonic motor using thick ring stator with nested PZT excitation

Measuring the photodetector frequency response for ultrasonic applications by a heterodyne system with difference- frequency servo control

Guided lamb wave electroacoustic devices on micromachined AlN/Al plates

A wideband multi-mode SAW filter employing pitch-modulated IDTs on cu-grating/15°YX-LiNbO₃-substrate structure

3-D numerical modeling for axisymmetrical piezoelectric structures: application to high-frequency ultrasonic transducers

A modified prandtl-ishlinskii model for modeling asymmetric hysteresis of piezoelectric actuators

Dual-frequency ultrasound imaging and therapeutic bilaminar array using frequency selective isolation layer

Megahertz-range guided pure torsional wave transduction and experiments using a magnetostrictive transducer

Torsional wave propagation in a circumferentially poled piezoelectric cylindrical transducer with unattached electrodes

Rayleigh and shear horizontal surface acoustic properties of (100) ZnO films on silicon

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Dual-frequency ultrasound imaging and therapeutic bilaminar array using frequency selective isolation layer

Content Provider	IEEE Xplore Digital Library
Author	Azuma, T. Ogihara, M. Kubota, J. Sasaki, A. Umemura, S.-i. Furuhata, H.
Copyright Year	1986
Abstract	A new ultrasound array transducer with two different optimal frequencies designed for diagnosis and therapy integration in Doppler imaging-based transcranial sonothrombolysis is described. Previous studies have shown that respective frequencies around 0.5 and 2 MHz are suitable for sonothrombolysis and Doppler imaging. Because of the small acoustic window available for transcranial ultrasound exposure, it is highly desirable that both therapeutic and diagnostic ultrasounds pass through the same aperture with high efficiency. To achieve such a dual-frequency array transducer, we propose a bilaminar array, having an array for imaging and another for therapy, with a frequency selective isolation layer between the two arrays. The function of this layer is to isolate the imaging array from the therapy array at 2 MHz without disturbing the 0.5-MHz ultrasound transmission. In this study, we first used a 1-D model including two lead zirconate titanate (PZT) layers separated by an isolation layer for intuitive understanding of the phenomena. After that, we optimized the acoustic impedance and thickness of the isolation layer by analyzing pulse propagation in a 2-D model by conducting a numerical simulation with commercially available software. The optimal acoustic impedance and thickness are 3 to 4 MRayl and ¿/10, respectively. On the basis of the optimization, a prototype array transducer was fabricated, and the spatial resolutions of the Doppler images it obtained were found to be practically the same as those obtained through conventional imaging array transducers.
File Size	1982287
File Format	PDF
ISSN	08853010
Volume Number	57
Issue Number	5
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-05-01
Publisher Place	U.S.A.
Access Restriction	One Nation One Subscription (ONOS)
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Ultrasonic imaging Frequency Ultrasonic transducer arrays Acoustic transducers Acoustic imaging Medical treatment Ultrasonic transducers Acoustic pulses Impedance Apertures
Content Type	Text
Resource Type	Article
Subject	Acoustics and Ultrasonics Instrumentation Electrical and Electronic Engineering

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