Phantom study evaluating detection of simulated upper airway occlusion using piezoelectric ultrasound transducers

Al-Abed, Mohammad A.; Antich, Peter P.; Watenpaugh, Donald E.; Behbehani, Khosrow

doi:10.1016/j.compbiomed.2017.08.019

Cited by 4 publications

(8 citation statements)

References 43 publications

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“…The main experimental setup used for this study was developed and used in the in vitro study described in [27]. The main components of the experimental setup were the (1) ultrasonic transmitter and receiver arrays, (2) pulse generator, (3) ultrasonic pre-amplifier, and (4) data acquisition station.…”

Section: Methodsmentioning

confidence: 99%

“…In designing and fabricating the sensors for detecting the presence of an occlusion in the upper airway during apneic episodes, the following design consideration needed to be addressed [30]:…”

Section: Transmitter and Receiver Arraysmentioning

confidence: 99%

“…In [27,28], the authors have presented a study of the feasibility of non-invasive detection of obstructive sleep apnea/hypopnea events during sleep using ultrasonic sensors. The hypothesis was that an ultrasonic signal transmitted through or reflected from an open airway would have different features than those associated with a completely or partially occluded airway.…”

Section: Introductionmentioning

confidence: 99%

“…We calculated the Q-value of the transmitted signal to be 18.4, given that the measured full-width halfmax (FWHM) bandwidth (−6 dB BW) is 0.17 MHz, and the actual central frequency of fc is 3.13 MHz. Hence, we can model the transmitted pulsed wave equation as follows (assuming the pulse is Gaussian-modulated) [31]:…”

mentioning

confidence: 99%

“…We propose the following stratified model of the neck tissues in an attempt to approximate the signal loss at multiple frequencies in the cases of an open airway and an occluded airway. Hence, we can model the transmitted pulsed wave equation as follows (assuming the pulse is Gaussian-modulated) [31]:…”

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confidence: 99%

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In Situ Investigation of Upper Airway Occlusion in Sleep Disordered Breathing Using Ultrasonic Transducer Arrays

2023

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This work presents a novel application of ultrasound for the real-time, non-invasive investigation of occlusion of the upper airway during events of obstructive sleep apnea/hypopnea syndrome. It is hypothesized that ultrasonic pulses applied to the neck during apneic events produce spectral and temporal features that can detect apnea occurrence. Theoretical models of ultrasound propagation and an in vitro test were conducted to test this hypothesis in both transmission and reflection modes. Complete specifications and technical details of the system design and fabrication, which is mounted on each subject’s neck, are presented, including the methodology. Nine patients (seven male and two female, mean age of 42 years, with a range of 25 to 56 years, and body mass index 37.6 ± 6.6 kg/m2) were recruited for a full night study, which included simultaneous nocturnal polysomnography for the validation of the results. Nine temporal features and four spectral features were extracted from the envelope of the received pulse waveform. These were used to compute 26 metrics to quantify the changes in the ultrasonic waveforms between normal breathing and apneic events. The statistical analysis of the collected ultrasonic data showed that at least two or more of the proposed features could detect apneic events in all subjects. The findings establish the feasibility of the proposed method as a cost-effective and non-invasive OSAHS screening tool.

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Section: Methodsmentioning

confidence: 99%

Section: Transmitter and Receiver Arraysmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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confidence: 99%

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confidence: 99%

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