Looking for online definition of impedance plethysmography in the Medical Dictionary? impedance plethysmography explanation free. What is impedance plethysmography? Meaning of impedance plethysmography medical term. What does impedance plethysmography mean?
TY - JOUR. T1 - Human chest wall function during epidural anesthesia. AU - Warner, David Oman. AU - Warner, Mark A.. AU - Ritman, Erik L.. PY - 1996. Y1 - 1996. N2 - Background: Although epidural anesthesia (EA) can significantly disrupt the function of the respiratory system, data concerning its effects on respiratory muscle activity and the resulting motion of the chest wall are scarce. This study aimed to determine the effects of lumbar EA on human chest wall function during quiet breathing. Methods: Six persons were studied while awake and during mid-thoracic (approximately a T6 sensory level) and high (approximately a T1 sensory level) lumbar EA produced by either 2% lidocaine (two persons) or 1.5% etidocaine (four persons) with 1:200,000 epinephrine. Respiratory muscle activity was measured using fine-wire electromyography electrodes. Chest wall configuration during high EA was determined using images of the thorax obtained by three-dimensional, fast computed tomography. The functional ...
Anderson and colleagues [1] retrospective analysis differs fundamentally from previous prospective analyses [2]. In the methods section, Anderson and colleagues report that deep-vein thrombosis was diagnosed by non-filling of a vein or venous segment despite repeated injections with contrast material. There is international agreement [2] that non-filling is not a criterion for DVT. Previous prospective analyses have shown that non-filling is inadequate for interpretation [2] but that IPG is sensitive to obstructive DVT. Non-filling as described by Anderson and colleagues may have been caused by technical problems [2] rather than an established venous thrombosis ...
TY - GEN. T1 - Noise analysis of MREIT at 3T and 11T field strength. AU - Sadleir, R. J.. AU - Grant, S. C.. AU - Zhang, S. U.. AU - Oh, S. H.. AU - Lee, B. I.. AU - Pyo, H. C.. AU - Park, C. J.. AU - Woo, E. J.. AU - Lee, S. Y.. AU - Seo, J. K.. AU - Kwon, O.. PY - 2005. Y1 - 2005. N2 - In Magnetic Resonance Electrical Impedance Tomography (MREIT), we measure the induced magnetic flux density inside an imaging object subject to an external injection current. The magnetic flux density is contaminated with noise and this ultimately limits the quality of reconstructed conductivity and current density images. By using two methods to analyze amounts of noise in 3T and 11T MREIT systems, we found that a carefully designed MREIT study will be able to reduce the noise level below 0.1 nT.. AB - In Magnetic Resonance Electrical Impedance Tomography (MREIT), we measure the induced magnetic flux density inside an imaging object subject to an external injection current. The magnetic flux density is ...
Impedance phlebography, or impedance plethysmography (IPG), is a non-invasive medical test that measures small changes in electrical resistance of the chest, calf or other regions of the body. These measurements reflect blood volume changes, and can indirectly indicate the presence or absence of venous thrombosis. This procedure provides an alternative to venography, which is invasive and requires a great deal of skill to execute adequately and interpret accurately. For the chest, the technique was developed by NASA to measure the split second impedance changes within the chest, as the heart beats, to calculate both cardiac output and lung water content. This technique has progressed clinically (often now called BioZ, i.e. biologic impedance, as promoted by the leading manufacturer in the US) and allows low cost, non-invasive estimations of cardiac output and total peripheral resistance, using only 4 skin electrodes, oscillometric blood pressure measurement and lung water volumes with minimal ...
quantium Medical Cardiac Output (qCO) uses impedance cardiography in a simple, continuous, and non-invasive way to estimate the Cardiac output (CO) and other hemodynamic parameters such as the Stroke Volume (SV) and Cardiac index (CI). The CO estimated by the qCO monitor is referred to as the qCO. The impedance plethysmography allows determining changes in volume of the body tissues based on the measurement of the electric impedance at the body surface. The assessment of Cardiac Output (CO) is important because it reveals the main cardiac function: the supply of blood to tissues. CO reflects the hemodynamic flow and hence the transport of oxygen; its clinical applications by non-invasive continuous hemodynamic monitoring are especially useful for some medical specialties like anaesthesiology, emergency care and cardiology, for example to prevent hypoperfusion and to guide fluid administration. Several authors advocate the high reliability and good correlation of cardiography impedance compared ...
A rate adaptive cardiac pacer is described in which the impedance versus time information derived using impedance plethysmography or the pressure versus time information derived from a pressure transducer in a ventricular chamber is signal processed to recover a modulating envelope due to volume or pressure changes occasioned by respiratory activity. Either or both of the respiratory interval or respiratory depth may be combined in an appropriate rate control algorithm with other parameters also derived from the impedance versus time signal to develop a rate control signal for an implanted pacer.
Rudolph J. Liedtke began his career an electronics technician with Dr. Jan Nyboer, a leading cardiovascular researcher at Wayne State University. Liedtke directly worked with Nyboer, pioneering bioelectrical impedance plethysmography in a variety of medical applications. Liedtke immersed himself in scientific texts and lectures in medicine, technology, chemistry, physics and electronics, eventually heading east to New York.. In the 1960s, Liedtke directed automated machine projects and nuclear technology for the US Navy for Century Detroit, a division of global technology giant Babcock & Wilcox (originally famous for its steam boiler designs hailed by Thomas Edison and used in the first public power generator stations in the 1880s.). Liedtke left Babcock & Wilcox in 1971 to start Controls Associates, Inc., with business partner Jim Slack, to design and manufacture electronic systems for automotive and machine tool industries. In the mid-70s, Liedtke designed the computer technology used to ...
Rudolph J. Liedtke began his career an electronics technician with Dr. Jan Nyboer, a leading cardiovascular researcher at Wayne State University. Liedtke directly worked with Nyboer, pioneering bioelectrical impedance plethysmography in a variety of medical applications. Liedtke immersed himself in scientific texts and lectures in medicine, technology, chemistry, physics and electronics, eventually heading east to New York.. In the 1960s, Liedtke directed automated machine projects and nuclear technology for the US Navy for Century Detroit, a division of global technology giant Babcock & Wilcox (originally famous for its steam boiler designs hailed by Thomas Edison and used in the first public power generator stations in the 1880s.). Liedtke left Babcock & Wilcox in 1971 to start Controls Associates, Inc., with business partner Jim Slack, to design and manufacture electronic systems for automotive and machine tool industries. In the mid-70s, Liedtke designed the computer technology used to ...
IP and International Patents. Skanray is active in creating and protecting its intellectual property with over 80 filed patents spanning Radiology, Monitoring and Critical care products. Skanray also ensures that intellectual property of our collaborators is respected and protected in all forms of interaction.. Skanray specializes in high-frequency high-voltage power supply for medical x-ray applications. Our unique patented x-ray shielding mechanisms and image processing algorithms, reduce the radiation dose and produce clinically excellent images. We have developed technologies for measurement of Non Invasive Blood pressure, SpO2 (Pulse Oximetry) and Cardiac Output (non invasive method based on Impedance plethysmography ...
Method to determine the arterial stiffness of an individual user (U) standing on a personal electronic scale having a top surface with at least three conductive pads on one of the left or right side of the scale, /a/-acquiring weight variations, and extracting therefrom a ballistocardiogram of the users heart beat, /b/-acquiring impedance plethysmography signals across one of the foot of the user, and extracting therefrom a blood pulse signal at the foot, /c/-calculating a time delay (DT) between the heart beat and the blood pulse signal arriving at the foot, /d/-deducing therefrom a value of the arterial stiffness of the user
Magnetic resonance electrical impedance tomography (MREIT) is a technique that produces images of conductivity in tissues and phantoms. In this technique, electrical currents are applied to an object and the resulting magnetic flux density is measured using magnetic resonance imaging (MRI) and the conductivity distribution is reconstructed using these MRI data. Currently, the technique is used in research environments, primarily studying phantoms and animals. In order to translate MREIT to clinical applications, strict safety standards need to be established, especially for safe current limits. However, there are currently no standards for safe current limits specific to MREIT. Until such standards are established, human MREIT applications need to conform to existing electrical safety standards in medical instrumentation, such as IEC601. This protocol limits patient auxiliary currents to 100 µA for low frequencies. However, published MREIT studies have utilized currents 10-400 times larger than ...
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A software toolbox for low-frequency conductivity and current density imaging using MRI is now available from http://iirc.khu.ac.kr/software.html. This MR-based conductivity imaging (MRCI) toolbox includes Matlab functions for image reconstructions in magnetic resonance electrical impedance tomography (MREIT), diffusion tensor MREIT (DTMREIT), conductivity... Read more ...
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Stroke is amongthe leading causes of death worldwide and requires immediate care to prevent death or permanent disability. Unfortunately, the current stateof stroke diagnosis is limited to fixed neuroimaging facilities that do not allow rapid stroke diagnosis. Hence, a portable stroke-diagnosis device could assist in the pre-hospital triage of patients. Moreover, such a portable device could also be useful for bedside stroke monitoring of patients in the Neuro Intensive Care Unit (Neuro-ICU) to avoid unnecessary neuroimaging. Recent animal studies and numerical simulations have supported the idea of implementing Electrical Bioimpedance (EBI) in a portable device, allowing non-invasive assessment as a useful tool for the pre-hospital triage of stroke and Traumatic Brain Injury (TBI) patients. Unfortunately, these studies have not reported any results from human subjects in the acute phase of the stroke. The numerical simulations are also based on simple models that sometimes lack necessary ...
Stroke is amongthe leading causes of death worldwide and requires immediate care to prevent death or permanent disability. Unfortunately, the current stateof stroke diagnosis is limited to fixed neuroimaging facilities that do not allow rapid stroke diagnosis. Hence, a portable stroke-diagnosis device could assist in the pre-hospital triage of patients. Moreover, such a portable device could also be useful for bedside stroke monitoring of patients in the Neuro Intensive Care Unit (Neuro-ICU) to avoid unnecessary neuroimaging. Recent animal studies and numerical simulations have supported the idea of implementing Electrical Bioimpedance (EBI) in a portable device, allowing non-invasive assessment as a useful tool for the pre-hospital triage of stroke and Traumatic Brain Injury (TBI) patients. Unfortunately, these studies have not reported any results from human subjects in the acute phase of the stroke. The numerical simulations are also based on simple models that sometimes lack necessary ...
Take the waterproof first aid tape and carefully wrap one side. Be sure to cover the entire ridged part of the transmitter and enough to the outer edge to protect the sticky electrode from water or drying out from air. But dont completely cover the hole at the edge of the transmitter. And make sure the end of the pig-tail wire is sticking out. Tear the tape or use the scissors ...
インピーダンス咽頭図(Impedance Pharyngography, 以下IPG)は嚥下活動中の頸部電気インピーダンスを測定するもので,嚥下機能評価を簡便かつ無侵襲に行うことができる手法である。IPG波形は嚥下機能を反映するものであるが嚥下機能の減退による波形への影響はその原因により様々である。すなわち嚥下機能の状態が異なる被験者のIPG波形を直接比較・診断することは測定者の主観に依存することになり客観性に欠ける。本研究では,まず青年健常者のNormal ...
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This will block the execution of the current function while waiting for the Promise to be fulfilled, *if* the implementation and this Promise support this operation. If supported, the function will return the result of the resolved Promise when it is fulfilled. If the Promise is resolved with an error, than this function will throw the provided error object. If the concurrency model of the implementation or the Promise object does not support blocking, the wait property should be a null or undefined. This API is not intended to imply that implementations that provide a wait function are superior ...
We analyzed five individual brands - across a variety of verticals - to see how they compared with IPG Media Labs industry benchmarks. We found that individual brand TV viewability had a broad range - from as low as 58.7% for a leading finance brand to 78.6% for a healthcare brand.
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The International Steering Committee of Electrical Impedance Tomography is pleased to announce that the 12th International Conference in Electrical Impedance Tomography (EIT 2011) will take place at the Department of electronic & Electrical Engineering, University of Bath, on 4-6 May 2011. The conference venue is the University of Bath, which is 15 minutes bus journey from the world heritage city of Bath. To find and book your accomodation please visit City of Bath accomodation Website. As usual, the conference will focus on medical applications of Electrical Impedance Tomography, Magnetic Induction Tomography, and Magnetic Resonance Electrical Impedance Tomography. ...
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Introduction. The American Heart Association Resuscitation Guidelines advocate four pad positions to achieve defibrillation success following cardiac arrest. Transthoracic impedance (TTI) reflects the electrode-skin interface and patient impedance and affects current amplitude, energy delivered and defibrillation efficacy. Modern defibrillators utilise an impedance compensated waveform to account for changes in TTI to improve defibrillation success. However the effect of electrode pad position and patient characteristics on TTI remains unclear.. Objective. To evaluate the effect of patient characteristics and pad position on Transthoracic impedance (TTI).. Methods. Patients undergoing diagnostic cardiac catheterisation were recruited for the study following regional ethical approval. Standard self-adhesive defibrillator electrodes were applied to patients in both the anterolateral and anteroposterior positions and connected to Heartsine Samaritan defibrillators. TTI was measured by applying a ...
Work has been intensified around the integration of textile and measurement technology for physiological measurements in the last years. As a result nowadays it is possible to find available commercial products for cardiovascular personal healthcare monitoring. Most of the efforts have been focused in the acquisition of EKG for cardiovascular monitoring where textile electrodes have shown satisfactory performance. Electrical Bioimpedance is another type of physiological measurement that can be used for personal healthcare monitoring where the integration and the performance of the textile electrodes has not been investigated that thoroughly. In this work, the influence of the textile electrodes on the measurements and on the estimation of the Cole (R0 , R?, fC and a) and body composition (TBW, ICW, ECW and FFM) parameters has been especially addressed. Complex Spectroscopy 4-electrode wrist-to-ankle electrical bioimpedance measurements taken with conventional Ag/AgCl and textile-electrodes on customized
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TY - JOUR. T1 - Identification of the human electrical impedance indifferent point. T2 - A surrogate for the volume indifferent point?. AU - Jarvis, Sara S.. AU - Pawelczyk, James A.. PY - 2009/8/12. Y1 - 2009/8/12. N2 - Head-up tilt (HUT) redistributes ∼700 mL of blood to the dependent regions. In a gravitational field, hydrostatic pressure is balanced against vascular compliance, resulting in a hydrostatic indifferent point (HIP) whose location should be coincident with an indifferent point for volume (VIP). Cardiac filling is determined by the hydrostatic gradient between the HIP/VIP and right atrium. We employed segmental impedance to examine blood volume redistribution during HUT and estimate the location of the VIP. During HUT, impedance increased in the chest and decreased in the lower abdomen, presumably due to blood volume shifts. Using a non-linear model to relate blood volume shifts to the hydrostatic gradient, we estimated the location of the electrical impedance indifferent point ...
Objective pulmonary function (PF) evaluation is essential for the diagnosis, monitoring, and management of many pediatric respiratory diseases as seen in the emergency room, intensive care, and outpatient settings. In this paper, the development and testing of a new noninvasive PF instrument, pneuRIPTM, which utilizes respiratory inductance plethysmography (RIP) are discussed. The pneuRIPTM hardware includes a small circuit board that connects to the RIP bands and measures and wirelessly transmits the band inductance data to any designated wirelessly connected tablet. The software provides indices of respiratory work presented instantaneously in a user-friendly graphical user interface on the tablet. The system was tested with ten normal children and compared with an existing system, Respitrace (Sensormedics, Yorba Linda, CA), under normal and loaded breathing conditions. Under normal breathing, the percentage differences between the two systems were 2.9% for labored breathing index (LBI), 31.8% ...
Experimental setup. (a) Interface impedance measurement (schematic of impedance measurement (left), fabricated MEA on PCB (right)); (b) Charge injection limit m
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A medical device having an impedance measurement circuit connected to at least two intracorporeal measurement electrodes arranged to measure the impedance of tissue inside the body of a patient. The i
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In this paper we demonstrate the use of the capillary pressure equilibrium theory (CPET) model to address the effects of partial saturation in order to estimate hydrocarbon saturation in a reservoir volume using acoustic impedances derived by seismic inversion. The data set used here has been donated by BHP Billiton, and is from an offshore oilfield called the Stybarrow field. The set comprises of a well with a 20-foot sandstone oil saturated pay section and 3D pre- and post-stack seismic volumes. Using the provided angle stacks and well log data, a statistical wavelet, and low impedance model, the final impedance model is computed. There are two final impedance models, derived from post-stack, and pre-stack data. The final impedance models are in agreement with one another at each of the well locations, with low impedance at the oil saturated well, and high impedance at the water saturated well. The corresponding CPET model is built based on the empirical porosity from the well log. The rock ...
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Looking for impedance meter? Find out information about impedance meter. electrical impedance meter Explanation of impedance meter
A method and apparatus are provided for estimating an impedance through a node at an intersection between roads in a roadway network. The impedance may be measured in time or distance, for example. Characteristic information describes at least one feature of the intersecting roads. One or more pieces of characteristic information may impact the impedance of traffic through an intersection and are used to estimate the impedance through the node. Examples of characteristic information are speed information, road-type, network routing level, intersection angle information, one-way, and cross traffic turn information. An impedance factor, or a cost, is assigned to each piece of characteristic information. The cost may be positive if the characteristic information adds impedance to the node, or negative if the characteristic information subtracts impedance from the node.
Ropar: Researchers at the Indian Institute of Technology Ropar are working on a new, personalized and cost-effective method for detection of early stage skin cancer. Led by Dr. Ramjee Repaka, Department of Mechanical Engineering, IIT Ropar, the team has successfully managed to perform early stage cancer detection using Dynamic Thermal Imaging (DTI) in a simple clinical setting. The main concept behind this research is the fact that the thermal properties of cancer and blood are different due to which few features appear at the skin surface quickly than the other under the DTI setting.. In this method, the surface of the skin is cooled with the help of cold gel pack for a short period of time post which the skin surface is allowed to recover from cold stress under a stabilized room condition. During this period, the changes in the temperature distribution is recorded as images and videos using a thermal camera. These recorded images and videos are then analyzed to identify the differential ...
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Early detection of decompensated heart failure enables clinicians to tailor medical therapy to individual patient needs. The utility of transthoracic impedance assessment in the early diagnosis of volume overload has been documented in the literature
Definition : Automated cytometers that measure the change in electrical impedance introduced by a suspension of cells in a conductive liquid when passing through an orifice. These cytometers include one electrode submerged in the cell suspension and one submerged in the aperture tube. The change in the impedance of the electrical path as the cells pass generates electrical pulses, which can be electronically counted and sized according to the number and volume of the cells.. Entry Terms : Impedance Cytometers , Electrical Impedance Cytometers , Coulter Cytometers , Coulter Cell Counters. UMDC code : 18632 ...
This report results from a contract tasking Harwell Laboratory as follows: The effects of radiation on electrical conductivity in ceramic insulators are briefly reviewed with emphasis on the radiation induced electrical degradation (RIED) effect in which large increases in the intrinsic electrical conductivity have been observed following irradiation within a restricted temperature range whiles subject to electric fields >600 V/cm. The aim of the present work was to extend the studies of the RIED effect to plasma-sprayed forms of alumina and spinel.*ELECTRICAL CONDUCTIVITY
1. Electrical impedance mammography is a simple, affordable and inexpensive method; it is radiation-free and non-invasive. In addition to visual assessment the method enables the examiner to carry out a quantitative evaluation of the mammograms, which is extremely important in differential diagnostics of various breasts states and their pathologies.. 2. The method has no contraindications and can be used as often as requited which is very important for case monitoring of women with breast pathologies as well as for case management, assigning of combined oral contraceptives or hormone replacements therapy.. 3. It allows to examine pregnant women and puerpera.. 4. The electrical impedance mammograph can be used in inpatient and outpatient departments of hospitals, maternity welfare centres, doctors offices and other institutions of public health. Thanks to its portability and compactness the device can be used for breast examination in remote areas, which lack stationary equipment.. 5. The method ...
Information on Middlesex University's Research Repository: a online collection of Middlesex University's research outputs
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Techniques to efficiently deliver interactive program guide (IPG) to a number of terminals. Each IPG page can be decomposed into a guide portion that is specific to each IPG page and a background portion that is common for all IPG pages. The background portion can be further decomposed into a time-varying video portion and other static portions. One method includes receiving a viewer selection for imagery, where the imagery includes at least one intracoded slice and at least one predictively coded slice, and each of the intracoded and predictively codes slices are associated with respective bitstreams. Packets from the at least one bitstream corresponding to the at least one intracoded slice of the selected imagery are extracted, and packets from the at least one bitstream corresponding to the at least one predictively coded slice of the selected imagery are also extracted. The payload portions of the extracted packets are then arranged to form the selected imagery.
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A system method that tracks one or more points on the surface of a cardiac tissue throughout a cardiac cycle and collect various types of data points which are then subsequently used to generate a corresponding model of the tissue and display the model as a 3D color coded image is described. In one embodiment, the system determines the position and orientation of a distal tip of a catheter, manipulates the catheter tip so as to maintain constant contact between the tip and a region of cardiac tissue using the impedance method, acquires positional and electrical data of the tip-tissue configuration through an entire heartbeat cycle, repeats the measurements as many times as needed in different tissue regions, and forms a 3D color coded map displaying various mechanical and electrical properties of the heart using the acquired data.
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As I feared, N8ZM isnt subscribed to the vna at tapr.org list, so his very informative reply to my message bounced. Its attached below. John -------- Original Message -------- Thanks, John...I think? First, lets assume that the instrument has been calibrated to the point where the bottom end of the coax connects. This will give us a very good measurement of the coax/antenna combination impedance, and this can be swept over whatever frequency range you desire, even well out of the band. The analyzer doesnt care about SWR, it just measures it, with one caveat: A VNA is a 50 ohm centric instrument, which means that it is very accurate when the impedance it sees is near 50 ohms. Just as on a Smith chart, the farther you are away from the center, the more difficult it becomes to resolve the measured value accurately. Determining the antenna impedance at the far end of an unknown T-line can be done, keeping in mind that the accuracy is not going to be as good as if the coax was not included. ...
How is Xilinx Controlled Impedance Technology abbreviated? XCITE stands for Xilinx Controlled Impedance Technology. XCITE is defined as Xilinx Controlled Impedance Technology rarely.
High-frequency digital sign processors suffer from electro-magnetic disturbance, because of its ever-increasing integration procedure and level acceleration. can be proportional to range can be inversely proportional to range and C inversely. Therefore, simplified equivalence, as well as the impedance can be depicted in Fig.?3. Fig.?3 Comparative circuit magic size As is demonstrated in Fig.?4, to be able to determine guidelines from the circuit, means the exterior impedance from the source, for the same internal current way to obtain the LSI/IC under measurement, as well as for the same internal impedance of these devices under measured. These devices internal impedance could be assessed by an impedance analyser, as can be proven in Fig.?5. The resonance frequency could be observed through the impedance diagram then. The resulting guidelines (and with an impedance analyser The exterior circuit current could KW-2449 be assessed by a range analyser as well as the particular sketch can be ...
The calculator calculates the inductance of the coil without core on the basis of the given coil length, diameter and number of turns.
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Temperature and melt anomalies of hotspot inferred from electrical conductivityTemperature and melt anomalies of hotspot inferred from electrical conductivity ...