2007
DOI: 10.1088/0031-9155/52/24/008
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Treatment of near-skull brain tissue with a focused device using shear-mode conversion: a numerical study

Abstract: Shear mode transmission through the skull has been previously proposed as a new trans-skull propagation technique for noninvasive therapeutic ultrasound (Clement 2004 J. Acoust. Soc. Am. 115 1356-64). The main advantage of choosing shear over longitudinal mode resides on the fact that there is less wavefront distortion with the former. In the present study, the regions of the brain suitable for shear-mode transmission were established for a simple focused ultrasound device. The device consists of a spherically… Show more

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Cited by 44 publications
(47 citation statements)
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References 40 publications
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“…Similar effects to these were seen by Vignon et al where the improvement in corrective delays acquired from a single point became worse than the uncorrected case at steering angles greater than 30° [74]. However, these effects were attributed to a conversion to shear waves at incidence angles greater than 30°, which the correction did not account for [76]. Due to the hemispherical shape of the array used here, the max incidence angle was on the order of about 8° and shear wave conversion at larger steering angles was likely not a factor.…”
Section: Discussionsupporting
confidence: 62%
“…Similar effects to these were seen by Vignon et al where the improvement in corrective delays acquired from a single point became worse than the uncorrected case at steering angles greater than 30° [74]. However, these effects were attributed to a conversion to shear waves at incidence angles greater than 30°, which the correction did not account for [76]. Due to the hemispherical shape of the array used here, the max incidence angle was on the order of about 8° and shear wave conversion at larger steering angles was likely not a factor.…”
Section: Discussionsupporting
confidence: 62%
“…A previously reported 3-layered ray acoustic model that includes shear wave propagation within the skull bone (Pichardo & Hynynen 2007) was augmented by including corrections that take into account the skull’s spatially dependent material properties. This was achieved by calculating spatially averaged acoustical properties independently for each ray path traversing the skull.…”
Section: Methodsmentioning
confidence: 99%
“…The shear wave, which is often much slower than longitudinal waves but also much more attenuated (White et al 2006), is converted back into a longitudinal wave when it reaches the skull cavity. Because the average speed of sound of shear waves in the skull is close to the speed of sound in water or soft tissue (Clement et al 2004, White et al 2006), accounting for this shear-mode conversion is of interest for applications targeting the cortex and subcortex brain tissue (Pichardo & Hynynen 2007). Recent studies have proposed transcranial sound transmission models that consider shear-wave propagation (Pichardo & Hynynen 2007, Pulkkinen et al 2014) but the lack of precise correlation between the density and the shear speed of sound often limits the applicability of the models.…”
Section: Introductionmentioning
confidence: 99%