Expression for noninvasive measurement of internal map of local Joule heat consumption using acousto-electric effect

Sumi, Chikayoshi

doi:10.1250/ast.30.310

Cited by 6 publications

(15 citation statements)

References 21 publications

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“…For noninvasive or nondestructive evaluation, the increased temperature is an error source in the mapping of the internal Joule heat distribution. However, for living tissues, a perfusion may mitigate such a problem (Sumi 2009). Besides, although the acoustic properties of soft tissues and liquid are similar and their influences to AE effect based imaging can be neglected, the impact of the reflecting and shielding effect at the interface between soft tissue and bone will be considerable (Cobbold 2006, Olafsson et al 2009a).…”

Section: Discussionmentioning

confidence: 99%

“…On the other hand its major limitations include low spatial resolution and degraded sensitivity in the center of imaging object (Wen 1999). Recently imaging techniques based on acousto-electric (AE) effect (Fox et al 1946, Jossinet et al 1998, 1999, Lavandier et al 2000a, 2000b) has attracted considerable interest (Zhang and Wang 2004, Witte et al 2007, Olafsson et al 2009a, Sumi 2009, Yang et al 2011) because of its potential to image tissue's electric property or electrophysiological functioning with high resolution. Such kind of high resolution impedance or current density imaging is made possible through the AE effect which describes the local electrical impedance changes in a conductive volume occupied by an ultrasonic wave packet.…”

Section: Introductionmentioning

confidence: 99%

“…Although in practice, such kind of knowledge may be obtained through another high resolution imaging modality such as MRI and known bench top impedance measurement of different tissue types, it poses uncertainty and possible imaging errors to the reconstructed current density using UCSDI approach. To avoid these errors, mapping the internal Joule heat consumption using acousto-electric effect was proposed (Sumi 2009). Such kind of ultrasound Joule heat imaging method does not need any priori knowledge of the conductivity distribution and the corresponding lead fields therefore is expected to be more reliable than UCSDI in practice.…”

Section: Introductionmentioning

confidence: 99%

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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: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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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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show abstract

“…All the sensor element outputs were first filtered to extract the AE signals, and then all the AE signals were amplified and summed up together using an additional circuit. (26)…”

Section: A Focused Spherical Sensor Array Designmentioning

confidence: 99%

A High-Density Beam-Forming Acoustic Sensor Array Design Based on Acoustoelectric Effect

2013

Sensors and Materials

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It is important to nondestructively detect the operating electrical equipment of a power grid. Acoustic detection is one of the most effective methods of electric equipment malfunction detection. A single sensor can only detect acoustic serials. A sensor array is needed for imaging acoustic field and acoustic source localization. Traditional acoustic measuring devices are available depending on the application. These devices, however, are limited by their specific physical properties, often leading to limited bandwidth, susceptibility to damage under high pressure and fragility to fabrication. Thus, it is difficult to integrate a high-intensity, large-scale acoustic sensor array. In this paper, a sensor array based on acoustoelectric effect is proposed for noninvasively imaging acoustic fields. This device can use material with excellent fabrication properties as an acoustic sensitivity element, so photolithography can be adopted to integrate a highintensity, large-scale acoustic sensor array. A focused spherical sensor array with a large focal length and a small focal spot is designed for imaging acoustic fields. The beam pattern calculation method is provided. Computer simulation results indicate that a beam with a large focal length of 180 cm and a small ellipse focal spot of 4.52 cm 2 can be formed using the proposed sensor array. Computer simulation of imaging a target acoustic field shows that a clear map of the target acoustic field can be obtained by noninvasively scanning the acoustic field with the proposed sensor array.

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“…Physically, this type of impedance change is caused by the mechanical compression and rarefaction induced by the ultrasound packet. Applications of AE effect to medicine and biology have recently been proposed (Zhang and Wang 2004, Olafsson et al 2009a, Sumi 2009). For example, acousto-electric tomography has been suggested for high resolution electrical impedance imaging of breast tissue (Zhang and Wang 2004).…”

Section: Introductionmentioning

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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Expression for noninvasive measurement of internal map of local Joule heat consumption using acousto-electric effect

Cited by 6 publications

References 21 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

A High-Density Beam-Forming Acoustic Sensor Array Design Based on Acoustoelectric Effect

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

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