Abstract:
: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.
journal_name
Physiol Measjournal_title
Physiological measurementauthors
Hachol A,Szczepanowska-Nowak W,Kasprzak H,Zawojska I,Dudzinski A,Kinasz R,Wygledowska-Promienska Ddoi
10.1088/0967-3334/28/1/006subject
Has Abstractpub_date
2007-01-01 00:00:00pages
61-72issue
1eissn
0967-3334issn
1361-6579pii
S0967-3334(07)27182-5journal_volume
28pub_type
杂志文章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
doi:10.1088/0967-3334/29/3/006
更新日期:2008-03-01 00:00:00
abstract::This paper investigates the main characteristics of the magneto-hemodynamic (MHD) response for application as a biomarker of vascular blood flow. The induced surface potential changes of a volunteer exposed to a 3 T static B0 field of a magnetic resonance imaging (MRI) magnet were measured over time at multiple locati...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/33/2/117
更新日期:2012-02-01 00:00:00
abstract:OBJECTIVE:Bioimpedance has been used to investigate changes in electrical parameters during ischemia in various tissues. The small intestine is a multi-layered structure, with several distinct tissue types, and ischemia related changes occur at different times in the different intestinal layers. When investigating how ...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/1361-6579/aa67b7
更新日期:2017-05-01 00:00:00
abstract::The relation between the right-side (RS) electrical impedance phase angle (PA) and segmental PA in five configurations at 50 kHz was analyzed in 23 peritoneal dialysis male patients before complete drainage of the abdominal cavity. The impedance vector (Z/H) components were standardized by the height H of the subjects...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/29/9/N01
更新日期:2008-09-01 00:00:00
abstract::The electrocardiogram is a representative signal containing information about the condition of the heart. The shape and size of the P-QRS-T wave, the time intervals between its various peaks, etc may contain useful information about the nature of disease affecting the heart. However, the human observer cannot directly...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/25/5/005
更新日期:2004-10-01 00:00:00
abstract::Gastro-oesophageal pH measurements are routinely carried out to quantify and determine if levels of acid reflux are responsible for symptoms. Although considered the 'gold standard', evidence suggests that pH measurements do not correlate well with the degree of oesophagitis seen during endoscopy. In this study the cu...
journal_title:Physiological measurement
pub_type: 临床试验,杂志文章
doi:10.1088/0967-3334/24/4/006
更新日期:2003-11-01 00:00:00
abstract::Current methods for analysing foetal heart rate (FHR) patterns have yet to meet their full potential in the recognition of hypoxia in the foetus. Following the recent suggestion that fractal analysis can be applied to FHR recordings, the current paper describes a method for distinguishing two simultaneous fractal dime...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/14/3/009
更新日期:1993-08-01 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
pub_type: 杂志文章
doi:10.1088/1361-6579/ab924b
更新日期:2020-07-09 00:00:00
abstract:OBJECTIVE:It is accepted that changes in the peripheral pulse waveform characteristics occur with ageing. Pulse risetime is one important feature which has clinical value. However, it is unclear how it varies across the full age spectrum from child to senior and for different peripheral measurement sites. The objective...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/1361-6579/ab9b67
更新日期:2020-08-11 00:00:00
abstract::A simple wearable device for sit-to-stand timing detection was designed and constructed with rate gyroscopes and accelerometers and a dedicated adaptive algorithm. The method was validated by comparison with optoelectronic equipment. Results from the comparison showed a maximal error always lower than 2.5 x 10(-2) s f...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/27/8/006
更新日期:2006-08-01 00:00:00
abstract::A nonlinear model predictive controller has been developed to maintain normoglycemia in subjects with type 1 diabetes during fasting conditions such as during overnight fast. The controller employs a compartment model, which represents the glucoregulatory system and includes submodels representing absorption of subcut...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/25/4/010
更新日期:2004-08-01 00:00:00
abstract::We investigated the utility of ICA for evaluation of fetal rhythm in five uncomplicated twin pregnancies and in five twin pregnancies complicated by fetal arrhythmia. Using objective and subjective criteria, we sought to determine how the signal-to-noise ratio, signal fidelity and interference rejection are affected w...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/32/1/004
更新日期:2011-01-01 00:00:00
abstract::The purpose of this study was to determine the validity and reliability of a timed 5 km cycle ergometer ride to predict maximum oxygen uptake (VO2max). Fifty-two healthy volunteers had their VO2max determined during a maximal treadmill run. They also performed a timed 5 km cycle ergometer ride. The resistance setting ...
journal_title:Physiological measurement
pub_type: 临床试验,杂志文章,随机对照试验
doi:10.1088/0967-3334/17/4/009
更新日期:1996-11-01 00:00:00
abstract::Cooperative sensors is a novel measurement architecture that allows the acquiring of biopotential signals on patients in a comfortable and easy-to-integrate manner. The novel sensors are defined as cooperative in the sense that at least two of them work in concert to measure a target physiological signal, such as a mu...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/36/4/767
更新日期:2015-04-01 00:00:00
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
doi:10.1088/0967-3334/36/5/967
更新日期:2015-05-01 00:00:00
abstract::Wearables such as accelerometers are emerging as powerful tools for quantifying gait in various environments. Flexibility in wearable location may improve ease of use and data acquisition during instrumented testing. However, change of location may impact algorithm functionality when evaluating associated gait charact...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/37/10/1785
更新日期:2016-10-01 00:00:00
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
doi:10.1088/0967-3334/37/10/1669
更新日期:2016-10-01 00:00:00
abstract::There has been a surge of interest in using electrical impedance tomography (EIT) for monitoring regional lung ventilation, however, EIT is an ill-conditioned problem, and errors/noise in the boundary voltages can have an undesirable effect on the quality of the final image. Most EIT systems in clinical usage use seri...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/34/6/659
更新日期:2013-06-01 00:00:00
abstract:BACKGROUND:Uterine activity monitoring is an essential part of managing the progress of pregnancy and labor. Although intrauterine pressure (IUP) is the only reliable method of estimating uterine mechanical activity, it is highly invasive. Since there is a direct relationship between the electrical and mechanical activ...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/1361-6579/ab37db
更新日期:2019-09-03 00:00:00
abstract:OBJECTIVE:Evoked tympanic membrane displacement (TMD) is a non-invasive technique for assessing intracranial pressure (ICP). The aim of this study was to define reference intervals (RIs) in the healthy population. APPROACH:Measurements were made in 154 healthy adults. Results were quantified by V m, which is the most ...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/1361-6579/aaa1d3
更新日期:2018-01-31 00:00:00
abstract::Two studies concerning multi-frequency impedance measurements are presented. The first uses tetrapolar measurements made on the thorax and the second electrical impedance tomography images, also made from the thorax. The way in which the impedance and the changes in impedance with ventilation depend upon frequency are...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/15/2a/001
更新日期:1994-05-01 00:00:00
abstract::High-frequency percussive ventilation (HFPV) may be defined as flow-regulated time-cycled ventilation that creates controlled pressure and delivers a series of high-frequency subtidal volumes in combination with low-frequency breathing cycles. In recent years, the usefulness of HFPV has been clinically assessed as an ...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/32/6/002
更新日期:2011-06-01 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
pub_type: 杂志文章
doi:10.1088/0967-3334/37/9/1624
更新日期:2016-09-01 00:00:00
abstract:OBJECTIVE:Tensiomyography (TMG) and myotonometry (MMT) are two novel technologies that measure neuromuscular properties. These two devices measure the stiffness of the soft tissue as well as other variables. The aim of this study is to analyze if there is any correlation between maximal radial displacement (Dm) and Sti...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/1361-6579/abcdf4
更新日期:2020-12-31 00:00:00
abstract::In this phenomenological study we focus on dynamic measurements of volatile organic compounds (VOCs) in exhaled breath under exercise conditions. An experimental setup efficiently combining breath-by-breath analyses using proton transfer reaction mass spectrometry (PTR-MS) with data reflecting the behaviour of major h...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/31/9/008
更新日期:2010-09-01 00:00:00
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
doi:10.1088/0967-3334/32/9/008
更新日期:2011-09-01 00:00:00
abstract::When used in large, national surveillance programmes, objective measurement tools provide prevalence estimates of low physical activity guideline compliance and high amounts of sedentary time. There are undoubtedly a plethora of reasons for this but one possible contributing factor is the current lack of behavioural c...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/37/10/1834
更新日期:2016-10-01 00:00:00
abstract::Part I of this series showed that the five-element circuit model accurately mimics impedances measured using multi-frequency electrical impedance myography (MFEIM), focusing on changes brought on by disease. This paper addresses two requirements which must be met if the method is to qualify for clinical use. First, th...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/34/2/223
更新日期:2013-02-01 00:00:00
abstract::The purpose of this study was to examine the validity and reliability of estimated parameters of the work-time relationship during cross-country ski ergometry using the traditional multi-trial critical power (CP) test and a 3 min 'all-out' test (3MT). Fourteen recreationally active male participants (mean ± SD; age: 2...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/35/1/31
更新日期:2014-01-01 00:00:00
abstract::Balance is the ability to maintain equilibrium while sitting or standing. There are a number of different methods which are used to assess balance: technical methods such as sway magnetometry, ataxia meter and force platforms, and clinical methods such as the functional reach test, Berg balance test and fall risk inde...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/21/4/309
更新日期:2000-11-01 00:00:00