The Institute of Physics ( IOP ) по журналам "Physiological Measurement"
Отображаемые элементы 1-20 из 414
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(1996-08-01)Electrical impedance tomography (EIT) is designed essentially for two-dimensional imaging, but current flow in the third dimension causes images to be formed for objects in 3D. The present work has shown that the image of ...
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(1995-08-01)This paper presents 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 ...
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(2000-02-01)A preliminary analysis is presented concerning the use of EIT for detecting impedance inhomogeneities within the human brain. The work to date is centred around the monitoring of two distinct impedance variations: those ...
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(1993-08-01)Surface insulation, together with laser Doppler flowmetry, was used to assess the skin microcirculation of paraplegic patients. Two control groups of five male and five female subjects were used to establish the response ...
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(1994-02-01)Measurement of total-body calcium (TBCa) is important in the study of several medical conditions. Neutron activation analysis (NAA) is sufficiently precise for serial measurements, but in order to provide single, absolute ...
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(1998-08-01)The availability of a Nanoform 600, a machine used in the contouring of optical components, with movement capabilities of 12.5 Å, made it possible to determine the sensitivity, accuracy and movement tracking ability of a ...
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(1995-08-01)A phantom was designed for testing and comparing multifrequency EIT data collection systems. The phantom simulates a cylinder of homogeneous conductor with 16 drive and 16 receive electrodes interleaved. Combinations of ...
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(1994-08-01)A combination of microendoscopy (which is a modification of endoscopy with fine rigid endoscopes) and spectrophotometry (which analyses on line the remission spectra from the endoscopic picture) is presented. This setup ...
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(1994-05-01)In this study, the selection of coil configuration parameters (coil radius and coil centre shift) for induced current electric impedance tomography (EIT) using circular coils is investigated. An alternative coil configuration ...
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(1993-11-01)In view of the complexity of the conductivity and the geometry of the human head, a numerical method would appear to be necessary for the adequate calculation of the electric potential and the magnetic induction generated ...
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(1994-11-01)The authors measured the signal-to-motion-artifact ratio for 10 paediatric/infant electrodes for infant apnoea monitoring. Electrodes that have good stability, strong adhesion, low face-to-face impedance, low transthorac ...
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(1993-11-01)Four commercial whole-body impedance measuring systems (Holtain, RJL, Bodystat and EZcomp) were compared on two separate occasions for a group of normal subjects. The first set of readings in 21 subjects demonstrated a ...
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(1993-02-01)An accurate reproducible measurement of left ventricular volume is important in the evaluation of cardiac disease. Four methods of left ventricular volume measurement by radionuclide ventriculography have been compared and ...
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(2000-02-01)Multi-frequency electrical impedance tomography (EIT) systems require stable voltage controlled current generators that will work over a wide frequency range and with a large variation in load impedance. In this paper we ...
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(1999-11-01)An objective method of extracting respiratory data from lung images is presented, together with a technique for automatically generating regions of interest delineating the anterior and posterior regions of the lungs. The ...
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(1994-05-01)Electric impedance tomography (EIT) images have been recorded from the upper thorax of 10 normal subjects and from two patients with pulmonary emboli. The Sheffield Mk2 system was used to obtain the EIT images during quiet ...
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(1993-05-01)A new technique for morphometric measurement of vertebral bodies has been described, in which a computerized image analysis system was used to digitize and measure standardized lateral radiographs of the thoracic and lumbar ...
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(1997-02-01)The measurement of patient activity over prolonged periods has been attempted with accelerometer-based devices, but these summate total acceleration and deceleration over time periods, are difficult to relate to recognizable ...
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(1993-05-01)A practical implementation of acoustic reflectometry for determining airway areas in routine clinical use is described. Advances over previous systems include portability, free breathing during measurements, no need to ...
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(1994-05-01)The characterization of tissue by means of electrical impedance tomography requires accurate impedance measurements at relatively high frequencies. The authors describe the design and fabrication of broad-band, active, ...
Отображаемые элементы 1-20 из 414