The Planar Transducer-a New Type of Transducer for Exciting Longitudinal Acoustic Waves

Pauw, L. J. van der

doi:10.1063/1.1754675

Cited by 19 publications

(2 citation statements)

References 2 publications

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“…In order to enhance AE signal, it is therefore desirable to use unipolar ultrasonic pulse for the ultrasound Joule heat tomography. On the other hand, researchers have shown that it is possible to generate unipolar pressure pulse in the transducer's focal zone using piezoelectric transducer (van der Pauw 1966, Brown and Weight 1974, Foster and Hunt 1978, Eisenmenger and Haardt 1982, Maeda et al 1991, Holé and Lewiner 1996, 1998). The merit of unipolar ultrasound pulse was also previously introduced by Lavandier et al (2000a) to quantitatively assess ultrasound induced resistance change in saline solution and will be used in the present 3D UJHT approach.…”

Section: Methodsmentioning

confidence: 99%

Three-dimensional noninvasive ultrasound Joule heat tomography based on the acousto-electric effect using unipolar pulses: a simulation study

Yang¹,

Xu²,

Song³

et al. 2012

Phys. Med. Biol.

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Electrical properties of biological tissues are highly sensitive to their physiological and pathological status. Thus it is of importance to image electrical properties of biological tissues. However, spatial resolution of conventional electrical impedance tomography (EIT) is generally poor. Recently, hybrid imaging modalities combining electric conductivity contrast and ultrasonic resolution based on acouto-electric effect has attracted considerable attention. In this study, we propose a novel three-dimensional (3D) noninvasive ultrasound Joule heat tomography (UJHT) approach based on acouto-electric effect using unipolar ultrasound pulses. As the Joule heat density distribution is highly dependent on the conductivity distribution, an accurate and high resolution mapping of the Joule heat density distribution is expected to give important information that is closely related to the conductivity contrast. The advantages of the proposed ultrasound Joule heat tomography using unipolar pulses include its simple inverse solution, better performance than UJHT using common bipolar pulses and its independence of any priori knowledge of the conductivity distribution of the imaging object. Computer simulation results show that using the proposed method, it is feasible to perform a high spatial resolution Joule heat imaging in an inhomogeneous conductive media. Application of this technique on tumor scanning is also investigated by a series of computer simulations.

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Section: Methodsmentioning

confidence: 99%

Three-dimensional noninvasive ultrasound Joule heat tomography based on the acousto-electric effect using unipolar pulses: a simulation study

Yang¹,

Xu²,

Song³

et al. 2012

Phys. Med. Biol.

View full text Add to dashboard Cite

show abstract

“…On the other hand, researches have shown that it is possible to generate unipolar pressure pulse using piezoelectric transducer in three different configurations (Brown and Weight 1974, Foster and Hunt 1978), i.e. a thick transducer electrically supplied by a uniform field (Eisenmenger and Haardt 1982, Maeda et al 1991), a thick transducer supplied by a divergent field (van der Pauw 1966), or a thin transducer with waveguide and backing medium coupled on both sides (Holé and Lewiner 1996, 1998). Holé and Lewiner (1996) presented a practical method to generate unipolar ultrasonic pulse using a single transducer with waveguide and backing medium coupled on both sides.…”

Section: Methodsmentioning

confidence: 99%

3D current source density imaging based on the acoustoelectric effect: a simulation study using unipolar pulses

Yang

et al. 2011

Phys. Med. Biol.

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It is of importance to image electrical activity and properties of biological tissues. Recently hybrid imaging modality combing ultrasound scanning and source imaging through the acousto-electric (AE) effect has generated considerable interest. Such modality has the potential to provide high spatial resolution current density imaging by utilizing the pressure induced AE resistivity change confined at the ultrasound focus. In this study, we investigate a novel 3-dimensional (3D) ultrasound current source density imaging (UCSDI) approach using unipolar ultrasound pulses. Utilizing specially designed unipolar ultrasound pulses and by combining AE signals associated to the local resistivity changes at the focusing point, we are able to reconstruct the 3D current density distribution with the boundary voltage measurements obtained while performing a 3D ultrasound scan. We have shown in computer simulation that using the present method, it is feasible to image with high spatial resolution an arbitrary 3D current density distribution in an inhomogeneous conductive media.

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Abstracted Bibliography

Fitting

Adler

1981

Ultrasonic Spectral Analysis for Nondestructive Evaluation

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The Planar Transducer-a New Type of Transducer for Exciting Longitudinal Acoustic Waves

Cited by 19 publications

References 2 publications

Three-dimensional noninvasive ultrasound Joule heat tomography based on the acousto-electric effect using unipolar pulses: a simulation study

Three-dimensional noninvasive ultrasound Joule heat tomography based on the acousto-electric effect using unipolar pulses: a simulation study

3D current source density imaging based on the acoustoelectric effect: a simulation study using unipolar pulses

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