Measurement of pupil reactivity using fast pupillometry.


:Analysis of human eye pupil reactivity is a very valuable diagnostic method used mainly for evaluation of the condition of the autonomic nervous system and the visual system. The paper presents an experimental pupillometer built in the Institute of Physics of the Wroclaw University of Technology. The apparatus makes it possible to record and analyze pupillary light reflex and spontaneous changes in the pupil diameter during a session in the dark. The detector system used in the pupillometer allows us to record the pupil diameter at a rate of 90 Hz with a linear accuracy of 0.008 mm. In this paper, the proposed detection method, the principle of operation and calibration of the apparatus and the possibilities of the measurement system are presented.


Physiol Meas


Hachol A,Szczepanowska-Nowak W,Kasprzak H,Zawojska I,Dudzinski A,Kinasz R,Wygledowska-Promienska D




Has Abstract


2007-01-01 00:00:00














  • Automatic detection of detached and erroneous electrodes in electrical impedance tomography.

    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

    pub_type: 杂志文章


    authors: Asfaw Y,Adler A

    更新日期:2005-04-01 00:00:00

  • PaCO2 measurement in cerebral haemodynamics: face mask or nasal cannulae?

    abstract:OBJECTIVE:PaCO2 affects cerebral blood flow (CBF) and its regulatory mechanisms, but the effects of CO2 measurement technique on cerebrovascular parameters are unknown. In order to determine if the two most commonly used approaches, face mask (FM) or nasal cannulae (NC), are interchangeable or not, we tested the hypoth...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Minhas JS,Robinson T,Panerai R

    更新日期:2017-06-22 00:00:00

  • An optimized lead system for long-term esophageal electrocardiography.

    abstract::Long-term electrocardiography (ECG) featuring adequate atrial and ventricular signal quality is highly desirable. Routinely used surface leads are limited in atrial signal sensitivity and recording capability impeding complete ECG delineation, i.e. in the presence of supraventricular arrhythmias. Long-term esophageal ...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Niederhauser T,Haeberlin A,Marisa T,Mattle D,Abächerli R,Goette J,Jacomet M,Vogel R

    更新日期:2014-04-01 00:00:00

  • Electrical biopsy of irradiated intestinal tissue with a simple electrical impedance spectroscopy system for radiation enteropathy in rats--a pilot study.

    abstract::Electrical impedance is one of the most often used parameters for characterizing material properties, especially in biomedical applications. Electrical impedance spectroscopy (EIS), used for revealing both resistive and capacitive characteristics, is good for use in tissue characterization. In this study, a portable a...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Huang YJ,Huang EY,Lu YY,Chen CY,Cheng KS

    更新日期:2011-09-01 00:00:00

  • Trabecular thickness measurement in cancellous bones: postmortem rat studies with the zoom-in micro-tomography technique.

    abstract::Using the cross-sectional images taken with the zoom-in micro-tomography technique, we measured trabecular thicknesses of femur bones in postmortem rats. Since the zoom-in micro-tomography technique is capable of high resolution imaging of a small local region inside a large subject, we were able to measure the trabec...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Cho MH,Chun IK,Lee SC,Cho MH,Lee SY

    更新日期:2005-10-01 00:00:00

  • Topographic distribution of idiopathic pulmonary fibrosis: a hybrid physics- and agent-based model.

    abstract:OBJECTIVE:Idiopathic pulmonary fibrosis (IPF) is a progressive and fatal disease characterized by excessive deposition of collagen and associated stiffening of lung tissue. While it is known that inflammation and dysfunction of fibroblasts are involved in disease development, it remains poorly understood how cells and ...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Wellman TJ,Mondoñedo JR,Davis GS,Bates JHT,Suki B

    更新日期:2018-06-28 00:00:00

  • Compressive sensing in electrical impedance tomography for breathing monitoring.

    abstract:OBJECTIVE:Electrical impedance tomography (EIT) is a functional imaging technique in which cross-sectional images of structures are reconstructed based on boundary trans-impedance measurements. Continuous functional thorax monitoring using EIT has been extensively researched. Increasing the number of electrodes, number...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Shiraz A,Khodadad D,Nordebo S,Yerworth R,Frerichs I,van Kaam A,Kallio M,Papadouri T,Bayford R,Demosthenous A

    更新日期:2019-04-03 00:00:00

  • A phantom for evaluating bone mineral density of the hand by dual-energy x-ray absorptiometry.

    abstract::Dual-energy x-ray absorptiometry (DXA) is a precise, widely used method for measuring bone mineral density (BMD), usually of the lumbar spine and femoral neck. Recent developments, such as a lower x-ray tube current and pixel by pixel analysis, enable smaller bones and thinner tissues volumes, as in the hand, to be me...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Steel SA,Swann P,Langley G,Langton CM

    更新日期:1997-08-01 00:00:00

  • A method for modelling and optimizing an electrical impedance tomography system.

    abstract::Electrical impedance tomography (EIT) image reconstruction is an ill-posed problem requiring maximum measurement precision. Recent EIT systems claim 60 to 80 dB precision. Achieving higher values is hard in practice since measurements must be performed at relatively high frequency, on a living subject, while using com...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Hartinger AE,Gagnon H,Guardo R

    更新日期:2006-05-01 00:00:00

  • Performance limits of ICA-based heart rate identification techniques in imaging photoplethysmography.

    abstract::Imaging photoplethysmography is a relatively new technique for extracting biometric information from video images of faces. This is useful in non-invasive monitoring of patients including neonates or the aged, with respect to sudden infant death syndrome, sleep apnoea, pulmonary disease, physical or mental stress and ...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Mannapperuma K,Holton BD,Lesniewski PJ,Thomas JC

    更新日期:2015-01-01 00:00:00

  • Within-breath measurement of respiratory impedance.

    abstract::The measurement of the complex respiratory impedance at a high temporal resolution is described. The measurement of impedance is correlated with the breathing cycle using electrical transthoracic impedance. This allows the determination of the complex impedance at any fixed point in the respiratory cycle, which result...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: van der Putten WJ,MacLeod D,Prichard JS

    更新日期:1993-08-01 00:00:00

  • The influence of dilution on the offline measurement of exhaled nitric oxide.

    abstract:OBJECTIVE:Measurement of fractional exhaled nitric oxide (FeNO) is used to determine the presence and severity of eosinophilic airway inflammation in asthma and other wheezing illnesses. The gold standard of online measurement during a single prolonged exhalation is not suitable for use in young children. The internati...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: MacBean V,Pooranampillai D,Howard C,Lunt A,Greenough A

    更新日期:2018-02-26 00:00:00

  • The effect of fracture and fracture fixation on ultrasonic velocity and attenuation.

    abstract::Measurement of the velocity of propagation and attenuation of ultrasound (200 kHz) is believed to be a useful non-invasive technique for assessing the mechanical properties of bone. A new method for the determination of ultrasound velocity and attenuation of longitudinal waves in cortical bone was used in vivo and in ...

    journal_title:Physiological measurement

    pub_type: 临床试验,杂志文章


    authors: Saulgozis J,Pontaga I,Lowet G,Van der Perre G

    更新日期:1996-08-01 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

  • The feasibility of in vivo quantification of bone-fluorine in humans by delayed neutron activation analysis: a pilot study.

    abstract::Fluorine (F) plays an important role in dental health and bone formation. Many studies have shown that excess fluoride (F(-)) can result in dental or skeletal fluorosis, while other studies have indicated that a proper dosage of fluoride may have a protective effect on bone fracture incidence. Fluorine is stored almos...

    journal_title:Physiological measurement

    pub_type: 临床试验,杂志文章


    authors: Chamberlain M,Gräfe JL,Byun SH,Chettle DR,Egden LM,Orchard GM,Webber CE,McNeill FE

    更新日期:2012-02-01 00:00:00

  • Contactless impedance measurement by magnetic induction--a possible method for investigation of brain impedance.

    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

    pub_type: 杂志文章


    authors: Netz J,Forner E,Haagemann S

    更新日期:1993-11-01 00:00:00

  • In vivo quantification of accumulating abdominal fluid using an electrical impedance tomography hemiarray.

    abstract::A new method to image and quantify intra-abdominal haemorrhage using electrical impedance tomography (EIT) was tested in vivo. Supine peritoneal dialysis patients were monitored using an 8-electrode hemiarray placed on the anterior abdomen. EIT measurements were recorded using the EPack II data acquisition system befo...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Tucker AS,Ross EA,Paugh-Miller J,Sadleir RJ

    更新日期:2011-02-01 00:00:00

  • Multimodal heart beat detection using signal quality indices.

    abstract::The electrocardiogram (ECG) is a well studied signal from which many clinically relevant parameters can be derived, such as heart rate. A key component in the estimation of these parameters is the accurate detection of the R peak in the QRS complex. While corruption of the ECG by movement artefact or sensor failure ca...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Johnson AE,Behar J,Andreotti F,Clifford GD,Oster J

    更新日期:2015-08-01 00:00:00

  • A method for comparative evaluation of EIT algorithms using a standard data set.

    abstract::The point spread function (PSF) is the most widely used tool for quantifying the spatial resolution of imaging systems. However, prerequisites for the proper use of this tool are linearity and space invariance. Because EIT is non-linear it is only possible to compare different reconstruction algorithms using a standar...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Ider YZ,Eyüboğlu BM,Kuzuoğlu M,Leblebïcïoğlu K,Baysal U,Cağlar BK,Bïrgül O

    更新日期:1995-08-01 00:00:00

  • An analytic solution to the homogeneous EIT problem on the 2D disk and its application to estimation of electrode contact impedances.

    abstract::An analytic solution of the potential distribution on a 2D homogeneous disk for electrical impedance tomography under the complete electrode model is expressed via an infinite system of linear equations. For the shunt electrode model with two electrodes, our solution coincides with the previously derived solution expr...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Demidenko E

    更新日期:2011-09-01 00:00:00

  • Short-term studies of heart rate variability: comparison of two methods for recording.

    abstract::Heart rate variability (HRV) is often analysed using short-term studies. Our objective was to compare two of them in a group of diabetic patients (reduced HRV) and in a control group. From the same 10 min surface electrocardiogram (ECG) two recordings were obtained. In one of them the whole signal was acquired through...

    journal_title:Physiological measurement

    pub_type: 临床试验,杂志文章


    authors: Migliaro ER,Canetti R,Contreras P,Hakas M,Eirea G,Machado A

    更新日期:2004-12-01 00:00:00

  • Thermography and colour duplex ultrasound assessments of arterio-venous fistula function in renal patients.

    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

    pub_type: 杂志文章


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

    更新日期:2006-01-01 00:00:00

  • Combined electrocardiogram and photoplethysmogram measurements as an indicator of objective sleepiness.

    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

    pub_type: 杂志文章


    authors: Chua CP,McDarby G,Heneghan C

    更新日期:2008-08-01 00:00:00

  • Coordinated FA-MS and SIFT-MS analyses of breath following ingestion of D2O and ethanol: total body water, dispersal kinetics and ethanol metabolism.

    abstract::A coordinated study of the dispersal of water between the various body compartments (stomach and gut, blood stream and tissue) and the similar dispersal kinetics of ethanol and its metabolism has been carried out involving two healthy volunteers using flowing afterglow mass spectrometry, FA-MS, and selected ion flow t...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Spanel P,Wang T,Smith D

    更新日期:2005-08-01 00:00:00

  • Video and audio processing in paediatrics: a review.

    abstract:OBJECTIVE:Video and sound acquisition and processing technologies have seen great improvements in recent decades, with many applications in the biomedical area. The aim of this paper is to review the overall state of the art of advances within these topics in paediatrics and to evaluate their potential application for ...

    journal_title:Physiological measurement

    pub_type: 杂志文章,评审


    authors: Cabon S,Porée F,Simon A,Rosec O,Pladys P,Carrault G

    更新日期:2019-02-26 00:00:00

  • Influence of tidal volume and positive end-expiratory pressure on ventilation distribution and oxygenation during one-lung ventilation.

    abstract:OBJECTIVE:The aim of the study was to explore the feasibility of titrating tidal volume (V T) and positive end-expiratory pressure (PEEP) during one-lung ventilation (OLV) based on ventilation distribution and oxygenation. APPROACH:Twenty-four consecutive patients requiring intubation with a double-lumen tube and subs...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Zhao Z,Wang W,Zhang Z,Xu M,Frerichs I,Wu J,Moeller K

    更新日期:2018-03-29 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

  • Variability in estimating shunt from single pulse oximetry measurements.

    abstract::Virtual shunt describes the overall loss of O2 content between the alveolar gas and arterial blood. Clinicians indirectly estimate the magnitude of the virtual shunt by monitoring peripheral blood oxygen saturation (SpO2) using non-invasive pulse oximetry. An inherent limitation of this method is the variable precisio...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Karlen W,Petersen CL,Dumont GA,Ansermino JM

    更新日期:2015-05-01 00:00:00

  • Imaging pathologic pulmonary air and fluid accumulation by functional and absolute EIT.

    abstract::The increasing use of EIT in clinical research on severely ill lung patients requires a clarification of the influence of pathologic impedance distributions on the validity of the resulting tomograms. Significant accumulation of low-conducting air (e.g. pneumothorax or emphysema) or well-conducting liquid (e.g. haemat...

    journal_title:Physiological measurement

    pub_type: 杂志文章


    authors: Hahn G,Just A,Dudykevych T,Frerichs I,Hinz J,Quintel M,Hellige G

    更新日期:2006-05-01 00:00:00

  • Empirical mode decomposition analysis of HRV data from patients undergoing local anaesthesia (brachial plexus block).

    abstract::Spectral analysis of heart rate variability (HRV) is used for the assessment of cardiovascular autonomic control. In this study, a data-driven adaptive technique called empirical mode decomposition (EMD) and the associated Hilbert spectrum has been used to evaluate the effect of local anaesthesia on HRV parameters in ...

    journal_title:Physiological measurement

    pub_type: 临床试验,杂志文章


    authors: Shafqat K,Pal SK,Kumari S,Kyriacou PA

    更新日期:2011-04-01 00:00:00