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 46 for “"Motion Artifacts"”.
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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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A Robust Algorithm for Identification of Motion Artifacts in Photoplethysmography Signals
… the sensor measurements using PPG. Presence of motion artifacts in the signal decreases the accuracy of estimating the parameters and therefore reduces the reliabilty of these sensor devices. Motion artifacts can be both periodic or aperiodic. Existing state-of-the-art methods for motion …
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Approaches for respiratory motion compensation in positron emission tomography imaging
Respiratory patient motion often causes image blur and inaccurate quantitation results in positron emission tomography (PET) imaging. Traditional gated acquisition approach corrects motion artifacts by generating a snapshot sequence. Each snapshot, however, is of poor image quality due to …
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An Integrated Compensation System Based on Empirical Mode Decomposition for Robust Noninvasive Blood Pressure Estimation
… number of patients diagnosed with hypertension. Motion artifacts are external sources of inaccuracy and can be due to sudden arm motion, muscle tremor, shivering, and transport vehicle vibration. Medium term drift, due to changing environmental factors, such as ambient temperature, can also …
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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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Evaluation of Artifacts In Experimental Cine 4D Ct Acquisition Methods
… for patients in whom the extent of target motion is large. 4D CT has become a standard of care for radiation treatment simulation, allowing decreased motion artifacts and increased spatiotemporal localization of anatomical structures that move. However, motion artifacts may still remain. …
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Algorithms for Tomographic Reconstruction: Fast Back Projection and Cardiac Computed Tomography
… a movie of the moving heart that is free of the motion artifacts of conventional methods.
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Wearable Pulse Oximetry in Construction Environments
… this study sought to understand the impact of motion artifacts caused by the worker's activities and to determine if those activities would prevent the blood gas sensor from detecting the onset of carbon monoxide poisoning. This feasibility study was conducted using a blood oxygen sensor rather …
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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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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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Non-Invasive Motion Detection and Classification in NICU Patients using Ballistographic Signals from a Pressure Sensitive Mat
Patient movements can cause motion artifacts on physiological signals and can result in false alarms in a continuous patient monitoring environment. This thesis explores the use of centre of pressure (COP) signals from a pressure sensitive mat to (a) detect patient movement in real-time, and (b) …
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Magnetic resonance diffusion imaging and spectral localization: New methods and their quantitative applications
… imaging, which is inherently insensitive to motion artifacts and can have higher signal-to-noise ratio compared with conventional Fourier transform imaging. Anisotropic diffusion of water in skeletal and smooth muscle has been investigated using this method. In addition, the water diffusion …
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Wavelength swept spectrally encoded confocal microscopy for biological and clinical applications
… the order of tens of frames per second to reduce motion artifacts from unavoidable patient movements. Rapid SECM imaging was achieved through the development of a novel wavelength swept laser which simultaneously provided high output power (> 10mrW), narrow linewidth (10GHz), broad wavelength …
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Acoustic Radiation Force Impulse Imaging of Myocardial Performance
… cycle. With the implementation of a quadratic motion filter, motion artifacts within the ARFI images were reduced to below 1.5 &mu m at all points of the cardiac cycle. The inclusion of pre-excitation displacement estimates in the quadratic motion filter further reduced physiological motion …
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Online, low-latency decision making for Fetal Magnetic Resonance Imaging with machine learning
… of HASTE images routinely suffer from fetal motion which leads to image artifacts, incomplete brain coverage as well as longer scan times. To address this problem, interleaved 3D Echo-planar Imaging (EPI) navigators are acquired along with HASTE images, which can provide pose information for …
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0.3V biopotential sensor interface for stress monitoring
… cancellation capability in order to reject the motion artifacts. The system, together with the ADC consumes 4.1nW power, and has an area of 0.2mm2 which makes the sensor interface suitable for wearable and implantable devices. The chip has been submitted for fabrication in a low power 65nm …
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A Pipeline for Zoomed Fetal MRI
… by unpredictable and substantial fetal motion that causes image artifacts and limits the set of viable diagnostic image contrasts. Fast, single-shot MRI of the fetal brain, such as HASTE, is a commonly applied acquisition method to mitigate artifacts from fetal motion by imaging over a …
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Application of bootstrap resampling in fMRI
… multiple repetitions. Fatigue, habituation, motion artifacts, and repositioning errors are few of the factors, which can affect the reproducibility of data. The conventional bootstrap resampling technique is based on the assumption that the dataset is independent and identically distributed …
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Ultrasound probe localization by tracking skin features
… and expensive equipment, and suffer from patient motion artifacts. This thesis presents a highly cost-effective and miniature-mobile system for ultrasound probe localization in six degrees of freedom that is robust to rigid patient motion. In this system, along with each acquisition of an …
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Multimodal Non-Contact Sensing of Neonatal Vital Signs Using Radar and Video
… in challenging real-life conditions, including motion artifacts and poor lighting. This work represents a step toward more robust, non-invasive monitoring solutions for neonatal care, with implications for broader applications in remote health monitoring.
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