The impact of piezoelectric PVDF on medical ultrasound exposure measurements, standards, and regulations

Harris, Gerald R.; Preston, R C; DeReggi, A.S.

doi:10.1109/58.883521

Cited by 53 publications

(33 citation statements)

References 132 publications

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“…A wide array of topics was discussed, but coverage was by no means complete. For example, the measurement of transient stress waves induced purposefully or not by medical laser radiation was omitted (but see [26] for a discussion). Also, noninvasive measurement of temperature rise in tissue via MRI or ultrasound was not discussed, nor were means to monitor cavitation activity (regarding the latter [209], [210] may be consulted).…”

Section: Discussionmentioning

confidence: 99%

“…4, a spot-poled membrane hydrophone is shown that has a spot size of 0.3 mm, which corresponds to approximately one wavelength at 5 MHz in water, and which is somewhat smaller than the actual effective hydrophone dimensions for spot-poled membrane hydrophones, due in part to fringe poling fields and angular variation of piezoelectric sensitivity [73], [74]. Also, depending on the electrode configuration, the dimensions can be asymmetric as well [26] and that issue's front cover image for other examples of PVDF hydrophones.) [74].…”

Section: A New Hydrophone Designsmentioning

confidence: 98%

“…Here the development of piezoelectric polymer hydrophones in the 1970s was a welcomed improvement. (Reference [26] contains a historical review of this subject. Also see Section III-A).…”

Section: A Effects Of Short Pulses and Nonlinear Propagation On Hydrmentioning

confidence: 99%

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Progress in medical ultrasound exposimetry

Harris

2005

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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Biomedical applications of ultrasound have experienced tremendous growth over the past 50 years. Early work in thermal therapy and surgery soon was followed by diagnostic imaging and Doppler. Because patient safety was an important issue from the beginning, the study of methods for measuring exposure levels, and their relationship to possible biological effects, paralleled the growth of the various therapeutic and diagnostic techniques. The diverse conditions of use have presented a range of exposure measurement challenges, and the sensors and techniques used to evaluate ultrasound fields have had to evolve as new or expanded clinical applications have emerged. In this paper some of the more notable of these developments are presented and discussed. Topics covered include devices and techniques, methods of calibration, progress in standardization, and current problem areas, including the effects of nonlinear propagation. Some early methods are described, but emphasis is given to more recent work applicable to present and future uses of ultrasound in medicine and biology.

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Section: Discussionmentioning

confidence: 99%

Section: A New Hydrophone Designsmentioning

confidence: 98%

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Progress in medical ultrasound exposimetry

Harris

2005

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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“…For this purpose, several devices are available for ultrasound beam characterization. The current gold standards are the piezoelectric transducers [1], which converts sound into electrical signal. However, these transducers can be damaged by high pressure field, especially if the phenomenon of cavitation is occurring.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic tomographic ultrasonic sensor

Grasland-Mongrain¹,

Gilles²,

Mari³

et al. 2013

Proceedings of Meetings on Acoustics

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In this article, the spatial resolution of the Lorentz force hydrophone is studied. This hydrophone is made of a metallic wire near a magnet. When the wire is moved by ultrasound while submitted to a magnetic field, the Lorentz force induces an electrical current proportional to the integral of pressure along the wire. 2D pressure field mapping is achieved by performing a tomography through wire translations and rotations in the imaging plane. The pressure field is compared with a computer simulation and a piezoelectric hydrophone taken in the same conditions. The electromagnetic hydrophone is potentially of great interest for High-Intensity Focused Ultrasound and shockwave transducers calibration. Published by the Acoustical Society of America through the American Institute of PhysicsGrasland-Mongrain et al.

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“…However, the most recommended technique remains the use of piezoelectric PVDF hydrophones as receivers. This is due to their advantageous acoustic properties and commercial availability [1]. Nevertheless, the electric signal delivered by these devices may be affected by their spatio-temporal transmission properties.…”

Section: Introductionmentioning

confidence: 99%

Spatio-temporal deconvolution of pulsed ultrasonic fields received by a transducer of linear aperture : a simulation study

Djerir¹,

Boutkedjirt²,

Si-Chaib³

et al.

IEEE Ultrasonics Symposium, 2005.

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In ultrasonic field measurements, the signal delivered by the receiving transducer is affected by the receiver spatiotemporal transmission properties. The pressure is spatially averaged over its finite-size aperture. Furthermore, frequency variations of its transfer function may distort the output signal. The efficiency of the deconvolution of these effects is shown by means of numerical simulations. The pulsed pressure field radiated by a wideband 10.3mm-radius planar transducer, with a central frequency f c = 2.25 MHz ( λ c : corresponding ultrasonic wavelength in water) is considered. The receiver is a linear aperture 25 µm-thick PVDF membrane hydrophone. The study shows that the quality of the reconstructed signal depends strongly upon the signal-to-noise ratio (SNR), the aperture dimensions and the distance from the source. For an aperture of length L = 2.6 mm ≈ 3.9λ c , placed on axis at z = 3 mm, correlation coefficients between the reconstructed pressure and the original one, p p rˆ, of 0.999, 0.988 and 0.655 have been obtained, for SNRs of 60, 40 and 20 dB respectively. For a greater aperture (L = 4.6 mm ≈ 6.9λ c ) and SNR = 40 dB, no satisfactory results could be obtained at this distance ( p p rˆ = 0.912). At a greater axial distance (z = 20 mm), better deconvolution results could be achieved ( p p rˆ = 0.928).

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The impact of piezoelectric PVDF on medical ultrasound exposure measurements, standards, and regulations

Cited by 53 publications

References 132 publications

Progress in medical ultrasound exposimetry

Progress in medical ultrasound exposimetry

Electromagnetic tomographic ultrasonic sensor

Spatio-temporal deconvolution of pulsed ultrasonic fields received by a transducer of linear aperture : a simulation study

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