Excitation of ultrasonic Lamb waves using a phased array system with two array probes: Phantom and in vitro bone studies

Nguyen, Khoa D.; Le, Lawrence H.; Tran, Tho N.H.T.; Sacchi, Mauricio D.; Lou, Edmond

doi:10.1016/j.ultras.2013.08.004

Cited by 44 publications

(24 citation statements)

References 24 publications

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“…B-mode ultrasound is mainly used to image soft tissues such as organs, muscles, vessels, mucosa, etc. Recently, ultrasound has been applied to study the properties of bone tissue [ 22 , 23 ], to estimate the cortical bone thickness [ 24 ], and to image spine in children with scoliosis [ 25 ].…”

Section: Introductionmentioning

confidence: 99%

Comparison of ultrasound imaging and cone-beam computed tomography for examination of the alveolar bone level: A systematic review

et al. 2018

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Background and objectiveThe current methods to image alveolar bone in humans include intraoral 2D radiography and cone-beam computed tomography (CBCT). However, these methods expose the subject to ionizing radiation. Therefore, ultrasound imaging has been investigated as an alternative technique, as it is both non-invasive and free from ionizing radiation. In order to assess the validity and reliability of ultrasonography in visualizing alveolar bone, a systematic review was conducted comparing ultrasound imaging to CBCT for examination of the alveolar bone level.Study designSeven databases were searched. Studies addressing examination of alveolar bone level via CBCT and ultrasound were selected. Risk of bias under Cochrane guidelines was used as a methodological quality assessment tool.ResultsAll the four included studies were ex vivo studies that used porcine or human cadaver samples. The alveolar bone level was measured by the distance from the alveolar bone crest to certain landmarks such as cemento-enamel junction or gingival margin. The risk of bias was found as low. The mean difference between ultrasound and CBCT measurements ranged from 0.07 mm to 0.68 mm, equivalent to 1.6% - 8.8%.ConclusionsThere is currently preliminary evidence to support the use of ultrasonography as compared to CBCT for the examination of alveolar bone level. Further studies comparing ultrasound to gold standard methods would be necessary to help validate the accuracy of ultrasonography as a diagnostic technique in periodontal imaging.

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Section: Introductionmentioning

confidence: 99%

Comparison of ultrasound imaging and cone-beam computed tomography for examination of the alveolar bone level: A systematic review

et al. 2018

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“…We hypothesize that this technique could improve not only the detectability of the FFGW mode, but also the clinical performance of related QUS methods. While phase-delayed excitation is common in ultrasound imaging (e.g., Li and Rose, 2001;Luo and Rose, 2007), only recently its application was proposed Nguyen et al, 2014) to skeletal axial transmission. a) Author to whom correspondence should be addressed.…”

Section: Introductionmentioning

confidence: 99%

“…The study of Nguyen et al (2014) focused on phantom and in vitro assessment of guided modes, mainly other than FFGW. The impact of soft coating was not considered.…”

Section: Introductionmentioning

confidence: 99%

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Tailoring the excitation of fundamental flexural guide waves in coated bone by phase-delayed array: Two-dimensional simulations

Kilappa

Moilanen

Salmi

et al. 2015

The Journal of the Acoustical Society of America

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The fundamental flexural guided wave (FFGW) enables ultrasonic assessment of cortical bone thickness. In vivo, it is challenging to detect this mode, as its power ratio with respect to disturbing ultrasound is reduced by soft tissue covering the bone. A phase-delayed ultrasound source is proposed to tailor the FFGW excitation in order to improve its power ratio. This situation is analyzed by 2D finite-element simulations. The soft tissue coating (7-mm thick) was simulated as a fluid covering an elastic plate (bone, 2-6 mm thick). A six-element array of emitters on top of the coating was excited by 50-kHz tone bursts so that each emitter was appropriately delayed from the previous one. Response was recorded by an array of receivers on top of the coating, 20-50 mm away from the closest emitter. Simulations predicted that such tailored/phase-delayed excitations should improve the power ratio of FFGW by 23 ± 5 dB, independent of the number of emitters (N). On the other hand, the FFGW magnitude should increase by 5.8 ± 0.5 dB for each doubling of N. This suggests that mode tailoring based on phase-delayed excitation may play a key role in the development of an in vivo FFGW assessment.

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“…2. For the relatively short propagation distances (a few cm) 8,12,18,44,57 , a complete dispersion extraction of the overlapping multimode is still challenging.…”

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Multichannel processing for dispersion curves extraction of ultrasonic axial-transmission signals: Comparisons and case studies

Cassereau

et al. 2016

The Journal of the Acoustical Society of America

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Some pioneering studies have shown the clinical feasibility of long bones evaluation using ultrasonic guided waves. Such a strategy is typically designed to determine the dispersion information of the guided modes to infer the elastic and structural characteristics of cortical bone. However, there are still some challenges to extract multimode dispersion curves due to many practical limitations, e.g., high spectral density of modes, limited spectral resolution and poor signal-to-noise ratio. Recently, two representative signal processing methods have been proposed to improve the dispersion curves extraction. The first method is based on singular value decomposition (SVD) with advantages of multi-emitter and multi-receiver configuration for enhanced mode extraction; the second one uses linear Radon transform (LRT) with high-resolution imaging of the dispersion curves. To clarify the pros and cons, a face to face comparison was performed between the two methods. The results suggest that the LRT method is suitable to separate the guided modes at low frequency-thickness-product ( fh) range; for multimode signals in broadband fh range, the SVD-based method shows more robust performances for weak mode enhancement and noise filtering. Different methods are valuable to cover the entire fh range for processing ultrasonic axial transmission signals measured in long cortical bones.

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Excitation of ultrasonic Lamb waves using a phased array system with two array probes: Phantom and in vitro bone studies

Cited by 44 publications

References 24 publications

Comparison of ultrasound imaging and cone-beam computed tomography for examination of the alveolar bone level: A systematic review

Comparison of ultrasound imaging and cone-beam computed tomography for examination of the alveolar bone level: A systematic review

Tailoring the excitation of fundamental flexural guide waves in coated bone by phase-delayed array: Two-dimensional simulations

Multichannel processing for dispersion curves extraction of ultrasonic axial-transmission signals: Comparisons and case studies

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