Three-Dimensional Brain-Computer Interface Control through Simultaneous Overt Spatial Attentional and Motor Imagery Tasks
Ballistocardiogram-Based Approach to Cuff-Less Blood Pressure Monitoring: Proof-of-Concept and Potential Challenges
We propose an ultra-convenient cuffless blood pressure (BP) monitoring approach based on the ballistocardiogram (BCG). The approach monitors BP using two mechanistically derived features in the whole-body, head-to-foot BCG: the time interval between the first and second major waves for DP, and the amplitude between the second and third major waves for pulse BP (PP; which can be added to DP to yield SP). The proposed approach can complement the conventional pulse transit time technique in two ways.
Real-Time Blood Pressure Estimation From Force-Measured Ultrasound
An ultrasound-based blood pressure estimation algorithm was developed as an alternative to the traditional oscillometric cuff, arterial catheter, or an auscultatory cuff. The method utilizes ultrasound image data of the carotid artery coupled with force measurements to estimate the blood pressure of an individual using a novel algorithm. The algorithm implements a deformation model to output an estimate of systolic and diastolic blood pressure, arterial stiffness, and surrounding tissue stiffness. Systolic pressure and diastolic pressure can be estimated in real-time and by the subject.
Bi-Modal Arterial Compliance Probe for Calibration-Free Cuffless Blood Pressure Estimation
We have developed a novel method and technology for calibration-free, cuffless evaluation of arterial Blood Pressure (BP). This method is based on simultaneous measurement of local pulse wave velocity using a dual-element photoplethysmograph sensor and arterial wall dynamics through HTIC’s proprietary ARTSENS® technology, thus eliminating the need for any calibration procedure.
Cuffless Estimation of Blood Pressure: Importance of Variability in Blood Pressure Dependence of Arterial Stiffness Across Individuals and Measurement Sites
This study quantifying anatomical site variability and individual variability in the calibration term for blood pressure (BP) estimation from pulse transit time. Using and accurately calculating hydrostatic changes in BP within the individual may be one method to increase accuracy of the calibration term.
Information-Theoretic Approach and Fundamental Limits of Resolving Two Closely-Timed Neuronal Spikes in Mouse Brain Calcium Imaging
We perform theoretical performance limits analysis for the problem of resolving temporally overlapping fluorescence waveforms in calcium imaging. We quantify the resolution and the theoretical bound on the precision of estimating the inter-spike-interval (ISI) from the statistical and information-theoretic point-of-views, respectively. We numerically obtain the minimum detectable ISI and evaluate the performance of our estimators. Our results show that ….
Electromagnetic Brain Source Imaging by Means of a Robust Minimum Variance Beamformer
We propose a technique called robust minimum variance beamformer (RMVB) which enables adaptive beamformers to remain robust against model non-idealities in the lead-field matrix. RMVB yields robustness by quantifying different model uncertainties as hyper-dimensional ellipsoids. These uncertainty regions, which can be estimated empirically by building several forward models, are then directly incorporated in the equations to estimate the spatial-filter weights which will be subsequently used for imaging.