Dynamics of the Vascular System

Li, John K.‐J.

doi:10.1142/4923

Cited by 87 publications

(62 citation statements)

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“…In contrast, [9] proposed that if the branching angle is considered, the optimum rate of energy is obtained when r 2 0 = r 2 1 cos θ 1 + r 2 2 cos θ 2 . The power laws can be reexpressed with respect to the asymmetry ratio to predict the area ratio:…”

Section: Previous Workmentioning

confidence: 99%

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Manual measurement of retinal bifurcation features

Al-Diri

Hunter

Steel³

et al. 2010

2010 Annual International Conference of the IEEE Engineering in Medicine and Biology

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Abstract-This paper introduces a new computerized tool for accurate manual measurement of features of retinal bifurcation geometry, designed for use in investigating correlations between measurement features and clinical conditions. The tool uses user-placed rectangles to measure the vessel width, and lines placed along vessel center lines to measure the angles. An analysis is presented of measurements taken from 435 bifurcations. These are compared with theoretical predictions based on optimality principles presented in the literature. The new tool shows better agreement with the theoretical predictions than a simpler manual method published in the literature, but there remains a significant discrepancy between current theory and measured geometry.

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Section: Previous Workmentioning

confidence: 99%

“…Some theoretical studies proposed that if the angle of branching is considered, the optimum rate of energy [9] is obtained when…”

Section: Markup Tool For Bifurcation Geometrymentioning

confidence: 99%

Manual measurement of retinal bifurcation features

Al-Diri

Hunter

Steel³

et al. 2010

2010 Annual International Conference of the IEEE Engineering in Medicine and Biology

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“…It has been demonstrated that a simple Fourier decomposition will allow the significant harmonics of the blood pressure pulse waveform to be observed [20]. Therefore, we evaluated the frequency and harmonic characteristics of the pulse waveform detected by the proposed pulse sensor.…”

Section: Analysis Of Pulse Pressure Waveformmentioning

confidence: 99%

Unconstrained pulse pressure monitoring for health management using hetero-core fiber optic sensor

Nishiyama¹,

Sonobe²,

Watanabe³

2016

Biomed. Opt. Express

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Abstract:In this paper, we present a pulse pressure waveform sensor that does not constrain a wearer's daily activity; the sensor uses hetero-core fiber optics. Hetero-core fiber sensors have been found to be sensitive to moderate bending. To detect minute pulse pressure changes from the radial artery at the wrist, we devised a fiber sensor arrangement using three-point bending supports. We analyzed and evaluated the measurement validity using wavelet transformation, which is well-suited for biological signal processing. It was confirmed that the detected pulse waveform had a fundamental mode frequency of around 1.25 Hz over the timevarying waveform. A band-pass filter with a range of frequencies from 0.85 to 1.7 Hz was used to pick up the fundamental mode. In addition, a high-pass filter with 0.85 Hz frequency eliminated arm motion artifacts; consequently, we achieved high signal-to-noise ratio. For unrestricted daily health management, it is desirable that pulse pressure monitoring can be achieved by simply placing a device on the hand without the sensor being noticed. Two types of arrangements were developed and demonstrated in which the pulse sensors were either embedded in a base, such as an armrest, or in a wearable device. A wearable device without cuff pressure using a sensitivity-enhanced fiber sensor was successfully achieved with a sensitivity of 0.07-0.3 dB with a noise floor lower than 0.01 dB or multiple subjects.

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“…For an aortic pressure waveform, 10 harmonics are sufficient to accurately reconstruct the waveform (Li, 2004). …”

Section: Haptics Renderingmentioning

confidence: 99%

ImaGiNe Seldinger: First simulator for Seldinger technique and angiography training

Luboz¹,

Zhang²,

Johnson³

et al. 2013

Computer Methods and Programs in Biomedicine

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Abstract.In vascular interventional radiology, procedures generally start with the Seldinger technique to access the vasculature, using a needle through which a guidewire is inserted, followed by navigation of catheters within the vessels. Visual and tactile skills are learnt in a patient apprenticeship which is expensive and risky for patients. We propose a training alternative through a new virtual simulator supporting the Seldinger technique: ImaGiNe (Imaging Guided interventional Needle) Seldinger. It is composed of two workstations: 1) a simulated pulse is palpated, in an immersive environment, to guide needle puncture, 2) two haptic devices provide a novel interface where a needle can direct a guidewire and catheter within the vessel lumen, using virtual fluoroscopy. Different complexities are provided by 28 real patient datasets. The feel of the simulation is enhanced by replicating, with the haptics, real force and flexibility measurements. A preliminary validation study has demonstrated training effectiveness for skills transfer.

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Dynamics of the Vascular System

Cited by 87 publications

References 0 publications

Manual measurement of retinal bifurcation features

Manual measurement of retinal bifurcation features

Unconstrained pulse pressure monitoring for health management using hetero-core fiber optic sensor

ImaGiNe Seldinger: First simulator for Seldinger technique and angiography training

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