Performance measurements of an infrared digital scanning laser ophthalmoscope.


:Direct digital acquisition of images using a scanning laser ophthalmoscope (SLO) offers several advantages over the conventional fundus camera; in particular, the ability to produce tomographic images using a confocal aperture. This note describes measurements of the performance of an SLO. Spatial resolution, measured by the modulation transfer function, MTF, was shown to be worse along the direction of scan. As expected, image uniformity was good, with a coefficient of variation of 1.9%. While the effect of using a 100 microns diameter confocal aperture instead of one with a 400 microns diameter was to reduce slice thickness from 2600 microns to 975 microns, image intensity was reduced by a factor of 30.


Physiol Meas


Manivannan A,Sharp PF,Forrester JV




Has Abstract


1994-08-01 00:00:00












  • Hemodynamic evaluation in pregnancy: limitations of impedance cardiography.

    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

    pub_type: 杂志文章


    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

  • Tracking boundary movement and exterior shape modelling in lung EIT imaging.

    abstract::Electrical impedance tomography (EIT) has shown significant promise for lung imaging. One key challenge for EIT in this application is the movement of electrodes during breathing, which introduces artefacts in reconstructed images. Various approaches have been proposed to compensate for electrode movement, but no comp...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Biguri A,Grychtol B,Adler A,Soleimani M

    更新日期:2015-06-01 00:00:00

  • Auditory magnetic fields in cochlear-implant patients.

    abstract::Neuromagnetic recordings were used to check if electrical stimulation of the auditory nerve in cochlear-implant patients activates cortical auditory areas in a similar manner as acoustic stimulation in normal hearing subjects or whether the excitation processes are different. The waveform of the evoked magnetic field ...

    journal_title:Physiological measurement

    pub_type: 杂志文章,评审


    authors: Pelizzone M

    更新日期:1993-11-01 00:00:00

  • Measurement of ventricular volume from blood conductance using two-dimensional finite element analysis.

    abstract::We used finite element analysis to study the relationship between the intraventricular blood conductance and the right ventricular volume. Previous studies reported a quasi-linear dependence between these two quantities. We quantified the effects of the resistivities of the surrounding tissues (e.g. heart wall, lungs)...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Panescu D,Webster JG,Stratbucker RA

    更新日期:1994-02-01 00:00:00

  • Quantitative description of the 3D regional mechanics of the left atrium using cardiac magnetic resonance imaging.

    abstract::The left atrium (LA) plays an important role in the maintenance of hemodynamic and electrical stability of the heart. One of the conditions altering the atrial mechanical function is atrial fibrillation (AF), leading to an increased thromboembolic risk due to impaired mechanical function. Preserving the regions of the...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Kuklik P,Molaee P,Podziemski P,Ganesan AN,Brooks AG,Worthley SG,Sanders P

    更新日期:2014-05-01 00:00:00

  • Static conductivity imaging using variational gradient Bz algorithm in magnetic resonance electrical impedance tomography.

    abstract::A new image reconstruction algorithm is proposed to visualize static conductivity images of a subject in magnetic resonance electrical impedance tomography (MREIT). Injecting electrical current into the subject through surface electrodes, we can measure the induced internal magnetic flux density B = (Bx, By, Bz) using...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Park C,Park EJ,Woo EJ,Kwon O,Seo JK

    更新日期:2004-02-01 00:00:00

  • False alarms during patient monitoring in clinical intensive care units are highly related to poor quality of the monitored electrocardiogram signals.

    abstract::Electrocardiograms (ECGs) recorded from patients in intensive care were investigated to quantify any relationship between ECG signal quality and false monitoring alarms. False alarms are a considerable problem for nursing and medical staff as they distract from clinical care, and are also a problem for patients as the...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Tsimenidis C,Murray A

    更新日期:2016-08-01 00:00:00

  • Recognition of elementary arm movements using orientation of a tri-axial accelerometer located near the wrist.

    abstract::In this paper we present a method for recognising three fundamental movements of the human arm (reach and retrieve, lift cup to mouth, rotation of the arm) by determining the orientation of a tri-axial accelerometer located near the wrist. Our objective is to detect the occurrence of such movements performed with the ...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Biswas D,Corda D,Baldus G,Cranny A,Maharatna K,Achner J,Klemke J,Jöbges M,Ortmann S

    更新日期:2014-09-01 00:00:00

  • Specific heat capacity of freshly excised prostate specimens.

    abstract::The specific heat capacity of tissue is a critical parameter for thermal therapies that act over a long period of time. It is also critical for thermoacoustic signal generation. We present ex vivo measurements of specific heat capacity performed by a dual-pin probe with tight temperature control of the specimen. One 3...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Patch SK,Rao N,Kelly H,Jacobsohn K,See WA

    更新日期:2011-11-01 00:00:00

  • Monitoring nasal conductance by bilateral nasal cannula pressure transducers.

    abstract::Nasal obstruction is common and may disturb well-being during daytime and sleep. Its objective assessment by standard methods requires patient cooperation and inconvenient instrumentation. Therefore, the purpose of this study was to develop a novel, unobtrusive technique for continuous monitoring of changes in nasal c...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Thurnheer R,Bloch KE

    更新日期:2004-04-01 00:00:00

  • Classification of cognitive reserve in healthy older adults based on brain activity using support vector machine.

    abstract:OBJECTIVE:Cognitive reserve (CR) refers to the capacity of the brain to actively cope with damage via the implementation of remedial cognitive processes. Traditional CR measurements focus on static proxies, which may not be able to appropriately estimate dynamic changes in CR. This study therefore investigated the cogn...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Yang CY,Lin CP

    更新日期:2020-07-07 00:00:00

  • Obstructive sleep apnea-hypopnea results in significant variations in cerebral hemodynamics detected by diffuse optical spectroscopies.

    abstract::The objective of this study was to adapt a novel near-infrared diffuse correlation spectroscopy (DCS) flow-oximeter for simultaneous and continuous monitoring of relative changes in cerebral blood flow (rCBF) and cerebral oxygenation (i.e. oxygenated/deoxygenated/total hemoglobin concentration: Δ[HbO2]/Δ[Hb]/ΔTHC) dur...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Hou Y,Shang Y,Cheng R,Zhao Y,Qin Y,Kryscio R,Rayapati A,Hayes D,Yu G

    更新日期:2014-10-01 00:00:00

  • Effects of whole-body mechanical stimulation at double the heart rate on the blood pressure waveform in rats.

    abstract::The effects of mechanical stimulation on hemodynamics, such as due to mechanotransduction in vascular endothelial cells, have been widely discussed recently. We previously proposed a resonance model in which the arterial system is treated as a pressure-transmitting system, and suggested that the application of externa...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Hsiu H,Jan MY,Wang WK,Wang YY

    更新日期:2006-02-01 00:00:00

  • A measurement of pulmonary blood volume increase during systole in humans.

    abstract::Pulmonary blood volume increase during systole was measured in patients by analysing chest images obtained during ECG gated radionuclide angiography examination. The difference in the total radiation counts between systole and diastole in regions of interest, which included the lungs and the left ventricle, was measur...

    journal_title:Physiological measurement

    pub_type: 临床试验,杂志文章


    authors: Nitzan M,Mahler Y,Schechter D,Yaffe S,Bocher M,Chisin R

    更新日期:1994-11-01 00:00:00

  • Detection of acute periodontal pain from physiological signals.

    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

    pub_type: 杂志文章


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

    更新日期:2018-09-27 00:00:00

  • Video rate electrical impedance tomography of vascular changes: preclinical development.

    abstract::Peripheral vasculature disease is strongly correlated with cardiovascular-associated mortality. Monitoring circulation health, especially in the peripheral limbs, is vital to detecting clinically significant disease at a stage when it can still be addressed through medical intervention. Electrical impedance tomography...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Halter R,Hartov A,Paulsen K

    更新日期:2008-03-01 00:00:00

  • Network proteomics of human dermal wound healing.

    abstract:OBJECTIVE:The healing of wounds is critical in protecting the human body against environmental factors. The mechanisms involving protein expression during this complex physiological process have not been fully elucidated. APPROACH:Here, we use reverse-phase protein microarrays (RPPA) involving 94 phosphoproteins to st...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Gao X,Petricoin EF 3rd,Ward KR,Goldberg SR,Duane TM,Bonchev D,Arodz T,Diegelmann RF

    更新日期:2018-12-07 00:00:00

  • Inductive plethysmography components analysis and improved non-invasive postoperative apnoea monitoring.

    abstract::Twenty-nine patients were monitored overnight for breathing distress patterns during postoperative analgesia. Nasal flow apnoea monitoring and pulse oximetry data were recorded at 50 Hz. Respiratory inductive plethysmography (RIP) tracked tidal volume (TV) thoracoabdominal motion, and supplemented the flow monitoring ...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Millard RK

    更新日期:1999-05-01 00:00:00

  • Empirically derived cut-points for sedentary behaviour: are we sitting differently?

    abstract::Sedentary behaviour (SB) is associated with a number of adverse health outcomes. Studies that have used ActiGraph monitors to define sedentary time tend to use a threshold of  <100 counts per minute (cpm) for classifying SB; however, this cut-point was not empirically derived for adults. It is not known whether ActiGr...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Clarke-Cornwell AM,Farragher TM,Cook PA,Granat MH

    更新日期:2016-10-01 00:00:00

  • Estimation of sleep stages in a healthy adult population from optical plethysmography and accelerometer signals.

    abstract:OBJECTIVE:This paper aims to report on the accuracy of estimating sleep stages using a wrist-worn device that measures movement using a 3D accelerometer and an optical pulse photoplethysmograph (PPG). APPROACH:Overnight recordings were obtained from 60 adult participants wearing these devices on their left and right w...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Beattie Z,Oyang Y,Statan A,Ghoreyshi A,Pantelopoulos A,Russell A,Heneghan C

    更新日期:2017-10-31 00:00:00

  • Magnetographic assessment of fetal hiccups and their effect on fetal heart rhythm.

    abstract::Fetal hiccups emerge as early as nine weeks post-conception, being the predominant diaphragmatic movement before 26 weeks of gestation. They are considered as a programmed isometric inspiratory muscle exercise of the fetus in preparation for the post-natal respiratory function, or a manifestation of a reflex circuitry...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Popescu EA,Popescu M,Bennett TL,Lewine JD,Drake WB,Gustafson KM

    更新日期:2007-06-01 00:00:00

  • Electroencephalography as a predictor of self-report fatigue/sleepiness during monotonous driving in train drivers.

    abstract:OBJECTIVE:In this study, electroencephalography activity recorded during monotonous driving was investigated to examine the predictive capability of monopolar EEG analysis for fatigue/sleepiness in a cohort of train drivers. APPROACH:Sixty-three train drivers participated in the study, where 32- lead monopolar EEG dat...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Lees T,Chalmers T,Burton D,Zilberg E,Penzel T,Lal S,Lal S

    更新日期:2018-10-30 00:00:00

  • Direct EIT Jacobian calculations for conductivity change and electrode movement.

    abstract::Electrical impedance tomography (EIT) is very sensitive to deformations of the medium boundary shape. For lung imaging, breathing and changes in posture move the electrodes and change the chest shape, resulting in image artefacts. Several approaches have been proposed to improve the reconstructed images; most methods ...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Gómez-Laberge C,Adler A

    更新日期:2008-06-01 00:00:00

  • Noise sensitivity of three surface ECG fibrillation detection algorithms.

    abstract::The widening application of automatic external defibrillators (AEDs) presents very strong requirements for external electrocardiogram (ECG) signal analysis. Highly accurate detection of shockable rhythms is required, aimed to approach the maximum of 100% sensitivity and specificity. In a previous study the performance...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Jekova I,Cansell A,Dotsinsky I

    更新日期:2001-05-01 00:00:00

  • Validity of an activity monitor in young people with cerebral palsy gross motor function classification system level I.

    abstract::The activPAL™ activity monitor has potential for use in youth with Cerebral Palsy (CP) as it has demonstrated acceptable validity for the assessment of sedentary and physical activity in other populations. This study determined the validity of the activPAL™ activity monitor for the measurement of sitting, standing, wa...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: O' Donoghue D,Kennedy N

    更新日期:2014-11-01 00:00:00

  • Assessment of 1-lead and 2-lead electrode patterns in electrical impedance endotomography.

    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

    pub_type: 杂志文章


    authors: Fournier-Desseux A,Jossinet J

    更新日期:2005-08-01 00:00:00

  • Effects of muscle injury severity on localized bioimpedance measurements.

    abstract::Muscle injuries in the lower limb are common among professional football players. Classification is made according to severity and is diagnosed with radiological assessment as: grade I (minor strain or minor injury), grade II (partial rupture, moderate injury) and grade III (complete rupture, severe injury). Tetrapola...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Nescolarde L,Yanguas J,Lukaski H,Alomar X,Rosell-Ferrer J,Rodas G

    更新日期:2015-01-01 00:00:00

  • In vivo neutron activation analysis of bone manganese in workers.

    abstract:OBJECTIVE:Manganese (Mn) is a neurotoxin. However, the impact of elevated, chronic Mn exposure is not well understood, partially due to the lack of a cumulative exposure biomarker. To address this gap, our group developed a compact in vivo neutron activation analysis (IVNAA) system to quantify Mn concentration in bone ...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Liu Y,Rolle-McFarland D,Mostafaei F,Zhou Y,Li Y,Zheng W,Wells E,Nie LH

    更新日期:2018-03-23 00:00:00

  • Validation of a finite-element solution for electrical impedance tomography in an anisotropic medium.

    abstract::Electrical impedance tomography is an imaging method, with which volumetric images of conductivity are produced by injecting electrical current and measuring boundary voltages. It has the potential to become a portable non-invasive medical imaging technique. Until now, implementations have neglected anisotropy even th...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Abascal JF,Arridge SR,Lionheart WR,Bayford RH,Holder DS

    更新日期:2007-07-01 00:00:00

  • Are ejection fractions from gated SPECT perfusion studies clinically useful? A comparison with radionuclide ventriculography.

    abstract::Gated SPECT (GSPECT) was evaluated for the measurement of left ventricular ejection fraction (LVEF) by comparing with equilibrium gated radionuclide ventriculography (RNVG). A total of 99 subjects underwent GSPECT and RNVG imaging. All studies were acquired in list mode with GSPECT studies processed to give 16- and 8-...

    journal_title:Physiological measurement

    pub_type: 临床试验,杂志文章


    authors: Wright GA,McDade M,Keeble W,Martin W,Hutton I

    更新日期:2001-05-01 00:00:00