Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 28 for “"motion artifact"”.
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Motion Artifact Reduction in Impedance Plethysmography Signal
… studies addressing the problem of removing motion artifact from the electrocardiogram (ECG) and photoplethysmography (PPG) signals in the past few years. However, no such study exists for the Impedance Plethysmography (IP) signal. The IP signal can be used to monitor respiration in mobile …
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Motion Artifact Processing Techniques for Physiological Signals
… performed in the hospital environment, artifacts continue to be a major issue for these systems. The magnitude and frequency of artifacts can vary signi�cantly depending on the recording environment with one of the major contributions due to the motion of the subject or the recording …
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Motion artifact cancellation for wearable photoplethysmographic sensor
… However, PPG signals are highly susceptible to motion artifacts, and in order for this technique to be useful for heart rate measurements around-the-clock, a motion artifact cancellation mechanism must be implemented to recover the blood volume pulse (BVP) from the corrupted signal. Various …
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Motion artifact reduction of electrocardiograms using multiple motion sensors
… ECG signal, the most problematic being that of motion artifacts. As an individual wearing a surface ECG moves, their movements will add noise to the signal. This noise is particularly difficult to remove, as it will change depending on the movements of the user and will often fall in the same …
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Use of Motion Artifact for the Detection of Respiratory Effort in Polysomnography
… respiratory effort by using the movement artifact found in the electromyographic (EMG) and electrocardiographic (ECG) recordings used in polysomnography was investigated. The resulting signals were compared to effort measured with respiratory inductance plethysmography (RIP). The EMG and …
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Signal Quality Analysis in Pulse Oximetry: Modelling and Detection of Motion Artifact
… applications, pulse oximetry is susceptible to motion artifact contamination. This thesis presents efforts to quantify and model the effects of motion artifact, and automatically detect periods of poor signal quality. First, the effects of motion artifact on SpO2 are analyzed using motion …
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Motion artifact reduction for wearable photoplethysmogram sensors using micro accelerometers and laguerre series adaptive filters
… becomes highly corrupted when the wearer is in motion, rendering the measured signal useless. This thesis develops an adaptive motion artifact reduction scheme to recover the underlying physiologic information from the corrupted signal using a collocated accelerometer as a motion reference and …
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Design and signal processing of finger photo plethysmograph ring sensors for reduced motion artifact and circulation interference
Thesis (S.M.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering; and, (S.M.)--Massachusetts Institute of Technology, Dept. of Electrical Engineering and Computer Science, 2002.
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The Removal Of Motion Artifacts From Non-invasive Blood Pressure Measurements
… These measurements are very sensitive to motion of the patient or the surroundings where the patient is. The slightest unexpected movements could offset the readings of the automatic Blood Pressure meter by a large amount or render the readings totally meaningless. Every effort must be …
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Stroboscopic Inline Coherent Imaging
… the system susceptible to an effect known as motion artifact. Motion artifact occurs when the interface moves over the detector exposure time, causing attenuation of the interfaces, or even a complete loss of signal when capturing high-speed motion. To address this challenge, I use …
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Design and analysis of artifact-resistive finger photoplethysmographic sensors for vital sign monitoring
… design issues are addressed: one is to minimize motion artifact and the other is to minimize the consumption of battery power. An efficient double ring design is developed to lower the influence of external force, acceleration, and ambient light, and to hold the sensor gently and securely on the …
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Ambulatory biopotential measurement
… under extreme conditions where there was more motion artifact, the number of missing R waves increased. The quality of raw ECU from the developed system was as good as the standard ECU during low motion artifact. It has been demonstrated that this newly developed biopotential system is less …
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Photoplethysmorgraph-derived respiration
… a strain gauge respiration band, mainly due to motion artifact. The field of monitoring heart rate and respiratory rate using the photoplethysmograph (PPG) signal is rapidly growing. The main objectives of the thesis is to design a PPG hardware an ear clip sensor and analog processing circuit -- …
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Ultrasonic Methods to Measure Shear Wave Velocity and Absorption for Tissue Viscoelasticity Characterization
… problems, such as undesired SW reflection, motion artifact and SW diffraction could occur in practical experimental configuration, which caused on SW measurements. Advanced ultrasound imaging system with high frame rate may be able to overcome these problems, yet the configuration of such …
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Computed tomography of cats without general anesthesia: feasibility, protocol development and assessment of cats with thoracic disease
… parameters including sharpness of liver margins, motion artifact, helical artifact and windmill artifact. The CT examinations were successfully completed in 90.9%of (20/22) normal cats. No artifacts directly related to the device were detected and 94% (75/80) of examinations were judged to have an …
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Modular High-DR Artifact-Resilient Wearable EEG Headset with Distributed Pulse-Based Feature Extraction and Multiplier-Less Neuromorphic Boosted Seizure Detection
… modular fully-flexible platform which achieves motion-artifact-resilient 80 dBDR EEG recording and highly-accurate, energy-efficient seizure detection. The innovation lies in a series of strategies that collectively result in a remarkable 72% reduction in overall power consumption: 1) performing …
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Dual wavelength polarimetry for monitoring glucose in the presence of varying birefringence
… glucose in a birefringent test cell subject to motion artifact. The results show that for a static, non-moving sample, glucose can be predicted to within 10 mg/dl for the entire physiologic range (0-600mg/dl) for either laser wavelength (523nm or 635nm). In the presence of moving birefringence, …
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Sensing the human alpha rhythm using a non-contact electroencephalographic (EEG) electrode
… recordings and issues related to hair and motion artifact are discussed. Areas critical to the development of this technology are suggested.</p>
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Motion-aircraft resistant design of photoplethysmograph ring sensor for driver monitoring
… specifically for countering the problem of motion artifact that almost all wearable PPG sensors are facing. Most importantly, the motion artifacts on PPG signals caused by motion in the direction of blood flow in the digital arteries along the finger flanks have been eliminated using a …
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