A digital technique for tracking moving interfaces

Groves, D.H.; Powałowski, T.; White, D. N.

doi:10.1016/0301-5629(82)90097-7

Cited by 24 publications

(2 citation statements)

References 7 publications

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“…The time-dependent position of the reflector can be tracked by considering the first positive detection [14]. Starting from within the lumen the first relevant echo reflects the lumen-intima boundary zero-crossing within a short observation window [16][17][18][19][20]. For motion towards the transducer the zero-while the second reflection originates from the mediaadventitia boundary [13].…”

Section: Diameter Assessmentmentioning

confidence: 99%

Non-invasive measurement of mechanical properties of arteries in health and disease

Hoeks

Brands

Willigers

et al. 1999

Proc Inst Mech Eng H

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Major conduit arteries should, by their elastic nature, be able to store blood volume temporarily during systole and release it during diastole. This reduces the systolic blood pressure required for the flow of a given volume quantity and gradually suppresses the pulsatile flow pattern. The haemodynamic characteristics of arteries have consequences for the load of the heart but also for the mechanical load of the arterial wall. The repetitive stretching of the wall (strains of up to 10 per cent) may cause fragmentation of the elastic fibres in the wall, modifying wall elasticity. To maintain wall stress the elastic arteries respond with a diameter increase in combination with an increase of arterial wall thickness. A larger diameter for a smaller distension (change in artery diameter from diastole to systole) will restrict the reduction in storage capacity. Alternatively, pulse pressure may go up increasing the mechanical load on the wall. In recent years various methods have been developed to assess and monitor the above interaction. Most of these methods are based on ultrasound techniques because of its wide availability and its non-invasive and non-traumatic nature. Presently these techniques enable the assessment of wall thickness, diastolic diameter, distension waveform, i.e., the tie-dependent change in diameter, the relative pulsatile increase in diameter, and pulse wave velocity, for elastic and muscular arteries in humans but also in small animals such as rats and mice. The present paper discusses the techniques in more detail.

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Section: Diameter Assessmentmentioning

confidence: 99%

Non-invasive measurement of mechanical properties of arteries in health and disease

Hoeks

Brands

Willigers

et al. 1999

Proc Inst Mech Eng H

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“…Recently, a deep learning method for artery motion tracking using ultrasound RF signals in B-mode was proposed in [62]. Using a Siamese neural network architecture of fully convolutional neural networks [63], adjacent scanlines of the ultrasound RF signals in a region of interest were matched using a similarity score of the cor- Methods of motion tracking using M-mode sequences of ultrasound RF signals that have been previously proposed include Doppler [65], thresholding [66], and phase locking techniques [67], [68]. Doppler techniques are prone to errors arising from mismatch in the demodulation frequency.…”

Section: B-mode Techniquesmentioning

confidence: 99%

Continuous Artery Monitoring Based on Decomposition of Ultrasound Radiofrequency Signals

Steinberg¹

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Ultrasound can noninvasively monitor the mechanical and dynamical properties of the artery. Scattering and overlap of adjacent tissue boundary echoes with those from the artery wall affect the estimation accuracy of the artery properties and impede continuous and automatic monitoring. Decomposition of the ultrasound radiofrequency (RF) signals using matching pursuit with particle swarm optimization is proposed to isolate the echoes arising from the tissue boundaries of the carotid artery wall for subsequent estimation of the wall thickness and diameter changes during the cardiac cycle. The proposed method exhibited less variance in the estimation of artery wall thickness when compared to manual estimation by a clinical method. Artery wall motion tracking by the proposed method was more robust compared to tracking achieved through the conventional cross-correlation technique when applied to the ultrasound RF signals from a wearable ultrasound sensor that contain a high volume of scattering echoes.

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Wall Motion Analysis

Hoskins

Bradbury

2011

Ultrasound and Carotid Bifurcation Atherosclerosis

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A digital technique for tracking moving interfaces

Cited by 24 publications

References 7 publications

Non-invasive measurement of mechanical properties of arteries in health and disease

Non-invasive measurement of mechanical properties of arteries in health and disease

Continuous Artery Monitoring Based on Decomposition of Ultrasound Radiofrequency Signals

Wall Motion Analysis

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