Correction for Hydrophone Spatial Averaging Artifacts for Circular Sources

Wear, Keith A.; Shah, Anant; Baker, Christian

doi:10.1109/tuffc.2020.3007808

Cited by 12 publications

(3 citation statements)

References 98 publications

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“…Following pressure field data collection, the RF signal containing the peak pressure amplitude was extracted and further processed to compute the derated intensity and mechanical index. Spatial averaging effects caused by the large size of the needle hydrophone element compared with the focal spot size of the transducer were corrected to rescale the measured pressure amplitudes p ( t ) 54 . The pulse intensity integral of the pressure wave was then calculated, 55

PII goodbreak= \frac{1}{ρc} \int_{0}^{T} p^{2} ()(, t) normald t

where c and ρ are the speed of sound and mass density of water, respectively.…”

Section: Methodsmentioning

confidence: 99%

“…Spatial averaging effects caused by the large size of the needle hydrophone element compared with the focal spot size of the transducer were corrected to rescale the measured pressure amplitudes p(t). 54 The pulse intensity integral of the pressure wave was then calculated, 55 where c and ρ are the speed of sound and mass density of water, respectively. Derating of the pulse intensity integral was done by assuming tissue attenuation to be 0.3 dB/MHz/ cm and that the pulse travels 200 μm from the sclera surface to the focus of the transducer.…”

Section: Safety Measurementsmentioning

confidence: 99%

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High‐frequency ultrasound point‐of‐care device to quantify myopia‐induced microstructural changes in the anterior sclera

Hoerig

Hoang

Aichele³

et al. 2023

Ophthalmic Physiologic Optic

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High myopia, or extreme nearsightedness, is a leading cause of blindness worldwide, especially when it progresses to pathologic myopia. Currently, no method exists to assess myopia development and severity quantitatively in vivo. Myopia is typically evaluated with measurements of axial length and refractive error. While these measures are useful to provide guidance for vision correction and are correlated with increased risk of pathologic myopia, they provide no direct information about the progression of pathologic changes within the eye tissues. Nor can these measures alone predict the likelihood of vision-threatening staphyloma formation in the posterior region of the eye.In myopia, images are focused anterior to, rather than upon, the retina. 1 More than 95% of myopia cases result from excessive axial length in the eye. 2 Globally, myopia affects up to 2.3 billion people, 3 and the prevalence is rising

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PII goodbreak= \frac{1}{ρc} \int_{0}^{T} p^{2} ()(, t) normald t

where c and ρ are the speed of sound and mass density of water, respectively.…”

Section: Methodsmentioning

confidence: 99%

Section: Safety Measurementsmentioning

confidence: 99%

High‐frequency ultrasound point‐of‐care device to quantify myopia‐induced microstructural changes in the anterior sclera

Hoerig

Hoang

Aichele³

et al. 2023

Ophthalmic Physiologic Optic

View full text Add to dashboard Cite

show abstract

“…However, their advantage is a significantly smaller sensor area with fiber core having only a few micrometers diameter compared to tens of micrometers for a typical multimode fiber. A more point-like detector therefore helps to accurately measure the pressure at a specific point [32] as well as offers higher sensor bandwidth in realistic configurations. Especially localized measurement is of interest for study of sonoporation [33].…”

Section: Introductionmentioning

confidence: 99%

Localized Measurement of a Sub-Nanosecond Shockwave Pressure Rise Time

Petelin

Lokar

Horvat

et al. 2022

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

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In a growing number of applications fast and localized pressure measurement in aqueous media is desired. To perform such measurements a custom made single-mode fiber optic probe hydrophone (FOPH) was designed and used to measure the pressure pulse generated by laser induced breakdown in water. The sensor enabled sub-nanosecond pressure rise time measurement. Both the rise time and the duration of the shockwave were found to be shorter in the direction perpendicular to the breakdown generating laser beam, compared to the shockwave observed in the parallel direction. Simultaneous highframerate imaging was used to qualitatively validate the novel hydrophone data and to observe the shockwave evolution. The measurements were performed also on pressure pulses emitted during generation of miniature (150 µm diameter) laser-induced bubbles at very small distances (down to 40 µm), further demonstrating the capabilities of the small-size sensor and the ability to measure locally. The results improve understanding of laser induced breakdown shockwave characteristics dependence on laser pulse energy and duration.

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Measurement of HIFU Pressures, Intensities, and Beamwidths Using Spatiotemporal Deconvolution

Wear,

Howard

2023

2023 IEEE International Ultrasonics Symposium (IUS)

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Correction for Hydrophone Spatial Averaging Artifacts for Circular Sources

Cited by 12 publications

References 98 publications

High‐frequency ultrasound point‐of‐care device to quantify myopia‐induced microstructural changes in the anterior sclera

High‐frequency ultrasound point‐of‐care device to quantify myopia‐induced microstructural changes in the anterior sclera

Localized Measurement of a Sub-Nanosecond Shockwave Pressure Rise Time

Measurement of HIFU Pressures, Intensities, and Beamwidths Using Spatiotemporal Deconvolution

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