Intraluminal ultrasound intensity distribution and backscattered Doppler power

Thompson, R.S.; Bambi, G.; Steel, R.; Tortoli, Piero

doi:10.1016/j.ultrasmedbio.2004.09.001

Cited by 9 publications

(3 citation statements)

References 12 publications

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Section: Discussionmentioning

confidence: 91%

“…The relatively lower level of the signal detected for lower velocities can be explained by nonuniform insonation of the tube cross-section. This phenomenon was studied by Thompson et al 20 and Steel and Fish. 21,22 The value of maximum detected velocity measured by the fully functional phased array probe (v MAX = 17.48 cm/s) is approximately 30% higher than the true maximum velocity in the tube of the Doppler phantom (13.26 cm/s).…”

Section: Doppler Spectrummentioning

confidence: 91%

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The Effect of Dead Elements on the Accuracy of Doppler Ultrasound Measurements

et al. 2013

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The objective of this study is to investigate the effect of multiple dead elements in an ultrasound probe on the accuracy of Doppler ultrasound measurements. For this work, we used a specially designed ultrasound imaging system, the Ultrasonix Sonix RP, that provides the user with the ability to disable selected elements in the probe. Using fully functional convex, linear, and phased array probes, we established a performance baseline by measuring the parameters of a laminar parabolic flow profile. These same parameters were then measured using probes with 1 to 10 disabled elements. The acquired velocity spectra from the functional probes and the probes with disabled elements were then analyzed to determine the overall Doppler power, maximum flow velocity, and average flow velocity. Color Flow Doppler images were also evaluated in a similar manner. The analysis of the Doppler spectra indicates that the overall Doppler power as well as the detected maximum and average velocities decrease with the increasing number of disabled elements. With multiple disabled elements, decreases in the detected maximum and average velocities greater than 20% were recorded. Similar results were also observed with Color Flow Doppler measurements. Our results confirmed that the degradation of the ultrasound probe through the loss of viable elements will negatively affect the quality of the Doppler-derived diagnostic information. We conclude that the results of Doppler measurements cannot be considered accurate or reliable if there are four or more contiguous dead elements in any given probe.

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Section: Discussionmentioning

confidence: 91%

Section: Doppler Spectrummentioning

confidence: 91%

The Effect of Dead Elements on the Accuracy of Doppler Ultrasound Measurements

et al. 2013

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“…The scattering of acoustic waves by a cylindrical tube and the radiation pressure on the tube have been studied extensively for five decades (Borovikov and Veksler 1985;Doolittle and Uberall 1966;Guo 1993;Hasegawa et al 1993). Thompson et al have also studied intraluminal ultrasound intensity in millimeter-sized vessels (Thompson and Aldis 1996;Thompson et al 2004a;Thompson et al 2004b). Recently, theoretical and experimental analyses have indicated that microtube boundaries can substantially change bubble oscillation in small tubes (Caskey et al 2006;Ory et al 2000;Qin and Ferrara 2006;Sassaroli and Hynynen 2006;Yuan et al 1999).…”

Section: Introductionmentioning

confidence: 99%

Transmitted Ultrasound Pressure Variation in Micro Blood Vessel Phantoms

Qin

Kruse

Ferrara

2008

Ultrasound in Medicine & Biology

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Silica, cellulose and polymethylmethacrylate tubes with inner diameters of ten to a few hundred microns are commonly used as blood vessel phantoms in in vitro studies of microbubble or nanodroplet behavior during insonation. However, a detailed investigation of the ultrasonic fields within these micro-tubes has not yet been performed. This work provides a theoretical analysis of the ultrasonic fields within micro-tubes. Numerical results show that for the same tube material, the interaction between the micro-tube and megaHertz-frequency ultrasound may vary drastically with incident frequency, tube diameter and wall thickness. For 10 MHz ultrasonic insonation of a polymethylmethacrylate (PMMA) tube with an inner diameter of 195 microm and an outer diameter of 260 microm, the peak pressure within the tube can be up to 300% of incident pressure amplitude. However, using 1 MHz ultrasound and a silica tube with an inner diameter of 12 microm and an outer diameter of 50 microm, the peak pressure within the tube is only 12% of the incident pressure amplitude and correspondingly, the spatial-average-time-average intensity within the tube is only 1% of the incident intensity.

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Intraoperative ultrasound in brain tumor surgery: A review and implementation guide

et al. 2022

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Accurate and reliable intraoperative neuronavigation is crucial for achieving maximal safe resection of brain tumors. Intraoperative MRI (iMRI) has received significant attention as the next step in improving navigation. However, the immense cost and logistical challenge of iMRI precludes implementation in most centers worldwide. In comparison, intraoperative ultrasound (ioUS) is an affordable tool, easily incorporated into existing theatre infrastructure, and operative workflow. Historically, ultrasound has been perceived as difficult to learn and standardize, with poor, artifact-prone image quality. However, ioUS has dramatically evolved over the last decade, with vast improvements in image quality and well-integrated navigation tools. Advanced techniques, such as contrast-enhanced ultrasound (CEUS), have also matured and moved from the research field into actual clinical use. In this review, we provide a comprehensive and pragmatic guide to ioUS. A suggested protocol to facilitate learning ioUS and improve standardization is provided, and an outline of common artifacts and methods to minimize them given. The review also includes an update of advanced techniques and how they can be incorporated into clinical practice.

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Intraluminal ultrasound intensity distribution and backscattered Doppler power

Cited by 9 publications

References 12 publications

The Effect of Dead Elements on the Accuracy of Doppler Ultrasound Measurements

The Effect of Dead Elements on the Accuracy of Doppler Ultrasound Measurements

Transmitted Ultrasound Pressure Variation in Micro Blood Vessel Phantoms

Intraoperative ultrasound in brain tumor surgery: A review and implementation guide

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