Identification of oxygen-19 during in vivo neutron activation analysis of water phantoms.

abstract：:Reliability of cerebral blood flow velocity (CBFV) and dynamic cerebral autoregulation estimates (expressed as autoregulation index: ARI) using spontaneous fluctuations in blood pressure (BP) has been demonstrated. However, reliability during co-administration of O2 and CO2 is unknown. Bilateral CBFV (using transcrani...

journal_title：Physiological measurement

authors： Minhas JS,Syed NF,Haunton VJ,Panerai RB,Robinson TG,Mistri AK

更新日期：2016-05-01 00:00:00

abstract：OBJECTIVE:To compare a novel cardiovascular magnetic resonance technique for the assessment of left ventricular (LV) mechanical discoordination by characterizing the endocardial center motion (ECM) in short-axis cine MRI in healthy volunteers and heart failure patients with left bundle branch block (HF-LBBB). APPROACH...

journal_title：Physiological measurement

authors： Saporito S,Houthuizen P,Aben JMM,Westenberg JJM,van Den Bosch HCM,van Assen HC,Mischi M

更新日期：2018-02-28 00:00:00

abstract：:Electrical impedance tomography (EIT) could be significantly advantageous to continuous monitoring of lung development in newborn and, in particular, preterm infants as it is non-invasive and safe to use within the intensive care unit. It has been demonstrated that accurate boundary form of the forward model is import...

journal_title：Physiological measurement

authors： Khor JM,Tizzard A,Demosthenous A,Bayford R

更新日期：2014-06-01 00:00:00

abstract：:Electrical impedance endotomography (EIE) is a modality of impedance imaging where the electrodes are located on an insulating core placed at the centre of the region of interest. The absence of a physical limit to the medium surrounding the probe enables the use of remote electrodes. The present study compares the fe...

journal_title：Physiological measurement

authors： Fournier-Desseux A,Jossinet J

更新日期：2005-08-01 00:00:00

abstract：OBJECTIVE:Brain-computer interfaces (BCIs) are aimed at providing a new way of communication between the human brain and external devices. One of the major tasks associated with the BCI system is to improve classification performance of the motor imagery (MI) signal. Electroencephalogram (EEG) signals are widely used f...

journal_title：Physiological measurement

authors： Su J,Yang Z,Yan W,Sun W

更新日期：2020-08-11 00:00:00

abstract：:There is considerable interest in unobtrusive and portable methods of monitoring sleepiness outside the laboratory setting. This study evaluates the usefulness of combined electrocardiogram (ECG) and photoplethysmogram (PPG) measurements for estimating psychomotor vigilance. The psychomotor vigilance test (PVT) was pe...

journal_title：Physiological measurement

authors： Chua CP,McDarby G,Heneghan C

更新日期：2008-08-01 00:00:00

abstract：:Obesity is associated with abnormal cardiac regulation by the autonomic nervous system (ANS), this being reversed by weight loss. Bariatric (weight-reduction) surgery can induce substantial long-term weight reductions. This study compares the acute influence on ANS control of two different types of bariatric surgery i...

journal_title：Physiological measurement

authors： Alam I,Lewis MJ,Morgan J,Baxter J

更新日期：2009-07-01 00:00:00

abstract：:Vascular and clinical assessments of arterio-venous fistula (AVF) function and access are important in patients undergoing or preparing to undergo renal dialysis. Objective assessment techniques include colour duplex ultrasound and more recently medical infrared thermography. Ideally, these should help assess problems...

journal_title：Physiological measurement

authors： Allen J,Oates CP,Chishti AD,Ahmed IA,Talbot D,Murray A

更新日期：2006-01-01 00:00:00

abstract：:The back-projected independent components (BICs) of single-trial, auditory P300 and contingent negative variation (CNV) evoked potentials (EPs) were derived using independent component analysis (ICA) and cluster analysis. The method was tested in simulation including a study of the electric dipole equivalents of the s...

journal_title：Physiological measurement

authors： Jervis B,Belal S,Camilleri K,Cassar T,Bigan C,Linden DE,Michalopoulos K,Zervakis M,Besleaga M,Fabri S,Muscat J

更新日期：2007-08-01 00:00:00

abstract：:External defibrillation requires the application of high voltage electrical impulses via large external electrodes, placed on selected locations on the thorax surface. The position of the electrodes is one of the major determinants of the transthoracic impedance (TTI) which influences the intracardiac current flow dur...

journal_title：Physiological measurement

authors： Krasteva V,Matveev M,Mudrov N,Prokopova R

更新日期：2006-10-01 00:00:00

abstract：OBJECTIVE:The Actiwatch 2 (AW2) is a wrist-worn accelerometer typically used to measure sleep. Although it can measure physical activity, there is limited evidence supporting its validity. We assessed the validity and reliability of the AW2 to measure sedentary behavior and physical activity (light, moderate, vigorous ...

journal_title：Physiological measurement

authors： Kemp C,Pienaar PR,Henst RHP,Roden LC,Kolbe-Alexander TL,Rae DE

更新日期：2020-09-04 00:00:00

abstract：:We have developed an eight-channel telemetry system for studying experimental models of chronic cardiovascular disease. The system is an extension of a previous device that has been miniaturized, reduced in power consumption and provided with increased functionality. We added sensors for ventricular dimension, and cor...

journal_title：Physiological measurement

authors： Kong W,Huang J,Rollins DL,Ideker RE,Smith WM

更新日期：2007-03-01 00:00:00

abstract：:The aim of the study was to investigate whether body mass index (BMI) influences the estimation of extracellular volume (ECV) in hemodialysis (HD) patients when using segmental bioimpedance analysis (SBIA) compared to wrist-to-ankle bioimpedance analysis (WBIA) during HD with ultrafiltration (UF). Twenty five HD patie...

journal_title：Physiological measurement

authors： Carter M,Morris AT,Zhu F,Zaluska W,Levin NW

更新日期：2005-04-01 00:00:00

abstract：:Capillary refill time (CRT) is a simple means of cardiovascular assessment which is widely used in clinical care. Currently, CRT is measured through manual assessment of the time taken for skin tone to return to normal colour following blanching of the skin surface. There is evidence to suggest that manually assessed ...

journal_title：Physiological measurement

authors： Blaxter LL,Morris DE,Crowe JA,Henry C,Hill S,Sharkey D,Vyas H,Hayes-Gill BR

更新日期：2016-01-01 00:00:00

abstract：:The non-invasive measurement of free field snoring sounds to estimate the site of snoring is an important development in the diagnosis, treatment and management of sleep-related breathing disorders. We investigated characteristics of the probability density function by testing the sensitivity of the statistical moment...

journal_title：Physiological measurement

authors： Beeton RJ,Wells I,Ebden P,Whittet HB,Clarke J

更新日期：2007-10-01 00:00:00

abstract：:The paper presents a method for adaptive decomposition of an electrical bio-impedance (BI) signal into two components: cardiac and respiratory. The decomposition of a BI signal is not a trivial process because of the non-stationarity of the signal components and overlapping of their harmonic spectra. An application sp...

journal_title：Physiological measurement

authors： Krivoshei A,Kukk V,Min M

更新日期：2008-06-01 00:00:00

abstract：:Impedance cardiography (ICG) has been proposed to estimate the stroke volume (SV) and cardiac output (CO) in various medical indications. The aim of this study was to explore the reliability of ICG during pregnancy with respect to SV and CO measurements. Blood pressure, heart rate and thoracic impedance were monitored...

journal_title：Physiological measurement

authors： Moertl MG,Schlembach D,Papousek I,Hinghofer-Szalkay H,Weiss EM,Lang U,Lackner HK

更新日期：2012-06-01 00:00:00

abstract：UNLABELLED:The study created an 'ex vivo' model to test different algorithms for measurements of mucosal haemoglobin saturation with visible light spectrophotometry (VLS). The model allowed comparison between algorithms, but it also allowed comparison with co-oximetry using a 'gold standard' method. This has not been d...

journal_title：Physiological measurement

authors： Gade J,Greisen G

更新日期：2016-09-01 00:00:00

abstract：:The holy grail of neuroimaging would be to have an imaging system, which could image neuronal electrical activity over milliseconds. One way to do this would be by imaging the impedance changes associated with ion channels opening in neuronal membranes in the brain during activity. In principle, we could measure this ...

journal_title：Physiological measurement

authors： Ahadzi GM,Liston AD,Bayford RH,Holder DS

更新日期：2004-02-01 00:00:00

abstract：:This paper represents a reconstruction algorithm using a direct sensitivity matrix (DSM) approach for fast 3D image reconstruction in electrical impedance imaging. The boundary element method (BEM) is used in the construction of this matrix. The first images of a conductivity perturbation inside a sphere are reconstru...

journal_title：Physiological measurement

authors： Morucci JP,Granié M,Lei M,Chabert M,Marsili PM

更新日期：1995-08-01 00:00:00

abstract：:In magnetic resonance electrical impedance tomography (MREIT) we inject currents through electrodes placed on the surface of a subject and try to reconstruct cross-sectional resistivity (or conductivity) images using internal magnetic flux density as well as boundary voltage measurements. In this paper we present a st...

journal_title：Physiological measurement

authors： Lee BI,Oh SH,Woo EJ,Lee SY,Cho MH,Kwon O,Seo JK,Baek WS

更新日期：2003-05-01 00:00:00

abstract：:Using a primary coil that induces eddy currents in a volume conductor, and a pair of secondary coils configured to form a differential transformer, it is possible to measure the conductivity of a volume conductor by the magnetic fields of the induced eddy currents. This method is especially favourable for measuring im...

journal_title：Physiological measurement

authors： Netz J,Forner E,Haagemann S

更新日期：1993-11-01 00:00:00

abstract：:Infant multiple breath washout (MBW) testing serves as a primary outcome in clinical studies. However, it is still unknown whether current software algorithms allow between-centre comparisons. In this study of healthy infants, we quantified MBW measurement errors and tried to improve data quality by simply changing so...

journal_title：Physiological measurement

authors： Anagnostopoulou P,Egger B,Lurà M,Usemann J,Schmidt A,Gorlanova O,Korten I,Roos M,Frey U,Latzin P

更新日期：2016-03-01 00:00:00

abstract：OBJECTIVE:To investigate the feasibility of the detection of brief orofacial pain sensations from easily recordable physiological signals by means of machine learning techniques. APPROACH:A total of 47 subjects underwent periodontal probing and indicated each instance of pain perception by means of a push button. Simu...

journal_title：Physiological measurement

authors： Teichmann D,Klopp J,Hallmann A,Schuett K,Wolfart S,Teichmann M

更新日期：2018-09-27 00:00:00

abstract：:One unfortunate occurrence in experimental measurements with electrical impedance tomography is electrodes which become detached or poorly connected, such that the measured data cannot be used. This paper presents an automatic approach to detect such erroneous electrodes. It is based on the assumption that all valid m...

journal_title：Physiological measurement

authors： Asfaw Y,Adler A

更新日期：2005-04-01 00:00:00

abstract：:In this study, we developed a novel technique for estimating non-constrained and cuffless blood pressure (BP) that was based on electrocardiogram (ECG) and ballistocardiogram (BCG). The BCG was non-invasively measured using a common electronic weighing scale when a subject was standing on it. The ECG was measured usin...

journal_title：Physiological measurement

authors： Shin JH,Lee KM,Park KS

更新日期：2009-07-01 00:00:00

abstract：OBJECTIVE:Though the mutual influence of cardiovascular and respiratory rhythms in healthy newborns has been documented, its full characterization is still pending. In general, the activity of many physiological subsystems has a well-expressed rhythmic character, and often an interdependency between physiological rhyth...

journal_title：Physiological measurement

authors： Lucchini M,Pini N,Fifer WP,Burtchen N,Signorini MG

更新日期：2018-06-19 00:00:00

abstract：:In the clinical environment the reliable interpretation of EIT images depends on the quality of the data. In the electrically noisy hospital environment the system performance needs to be assessed for each clinical investigation. From the model of noise presented, a figure of merit for comparisons of system performanc...

journal_title：Physiological measurement

authors： Meeson S,Blott BH,Killingback AL

更新日期：1996-11-01 00:00:00

abstract：:Electrical impedance tomography (EIT) estimates an image of change in electrical properties within a body from stimulations and measurements at surface electrodes. There is significant interest in EIT as a tool to monitor and guide ventilation therapy in mechanically ventilated patients. In lung EIT, the EIT inverse p...

journal_title：Physiological measurement

authors： Grychtol B,Adler A

更新日期：2014-06-01 00:00:00

abstract：OBJECTIVE:To investigate if modern seismocardiography (SCG) and ballistocardiography (BCG) are useful in the detection of hemodynamic changes occurring during simulated obstructive apneic events. METHODS:Forty-seven healthy volunteers performed a voluntary maximum Mueller maneuver (MM) for 10 s, and SCG and BCG signal...

journal_title：Physiological measurement

authors： Morra S,Hossein A,Gorlier D,Rabineau J,Chaumont M,Migeotte PF,Van De Borne P

更新日期：2020-07-09 00:00:00