Abstract:
:This paper introduces a new clinical distortion index able to measure the decrease in diagnostic content in compressed echocardiograms. It is calculated using cardiologists' answers to a clinical testbed composed of two types of tests: one blind and the other semi-blind. This index may be used to compare clinical performance among video codecs from a clinical perspective. It can also be used to classify compression rates into useful and useless ranges, thus providing recommendations for echocardiogram compression. A study carried out in order to illustrate its use with Xvid video codec is also presented. The results obtained showed that, for 2D and M modes, the transmission rate should be at least 768 kbit s(-1) and for color Doppler mode and pulsed/continuous Doppler, 256 kbit s(-1).
journal_name
Physiol Measjournal_title
Physiological measurementauthors
Alesanco A,Hernández C,Portolés A,Ramos L,Aured C,García M,Serrano P,García Jdoi
10.1088/0967-3334/30/5/001subject
Has Abstractpub_date
2009-05-01 00:00:00pages
429-40issue
5eissn
0967-3334issn
1361-6579pii
S0967-3334(09)92782-4journal_volume
30pub_type
杂志文章abstract::It has previously been shown that extreme changes in ambient air temperature can affect whole-body bioelectrical impedance. The purpose of this study was to determine if more moderate changes in ambient air temperature, such as those experienced in most laboratory settings, would also affect bioelectric impedance anal...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/25/1/011
更新日期:2004-02-01 00:00:00
abstract::Non-invasive in vivo neutron activation analysis (NAA) was used to measure the fluorine concentration in 35 people in Hamilton, Ontario, Canada. Measurement and precision data of this second generation NAA system were determined in 2013, and the results were compared with the performance of a first generation system u...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/36/3/465
更新日期:2015-03-01 00:00:00
abstract::Non-contact heart and lung activity monitoring would be a desirable supplement to conventional monitoring techniques. Based on the potential of non-contact magnetic induction measurements, requirements for an adequate monitoring system were estimated. This formed the basis for the development of the presented extendab...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/29/6/S25
更新日期:2008-06-01 00:00:00
abstract::In this study, the selection of coil configuration parameters (coil radius and coil centre shift) for induced current EIT using circular coils is investigated. An alternative coil configuration is suggested, which produces approximately linear (spatially) magnetic fields in order to strengthen the currents in the cent...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/15/2a/007
更新日期:1994-05-01 00:00:00
abstract:OBJECTIVE:Using raw, sub-second-level accelerometry data, we propose and validate a method for identifying and characterizing walking in the free-living environment. We focus on sustained harmonic walking (SHW), which we define as walking for at least 10 s with low variability of step frequency. APPROACH:We utilize th...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/1361-6579/aaa74d
更新日期:2018-02-28 00:00:00
abstract::A finite difference model of the human thorax with 113,400 control volumes (nodes) based on ECG gated MRI images was used to evaluate the Sheffield DAS-01P EIT system. Sixteen simulated electrode positions equally spaced around the thorax model at approximately the fourth intercostals space level were selected. Pairs ...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/24/2/357
更新日期:2003-05-01 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:OBJECTIVE:This paper aims to present how physiological signals can be processed based on wavelet decomposition to calculate multiple physiological parameters in real-time on an embedded platform. APPROACH:An ECG and PPG are decomposed to the appropriate scale based on a quadratic spline wavelet base in order to obtain...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/1361-6579/ab6f52
更新日期:2020-03-06 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::The outside of the skin of the forearm is typically 15 mV more negative than the inside. Stretching the skin causes a reduction in the magnitude of this skin potential V, which we observe as a motion artifact delta V. We seek to determine the origin of this motion artifact by successively stripping 12 layers of the sk...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/17/2/003
更新日期:1996-05-01 00:00:00
abstract::The ability to predict if an atrial fibrillation (AF) episode terminates spontaneously or not through non-invasive techniques is a challenging problem of great clinical interest. This fact could avoid useless therapeutic interventions and minimize the risks for the patient. The present work introduces a robust AF pred...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/29/1/005
更新日期:2008-01-01 00:00:00
abstract::The paper presents a method for adaptive decomposition of an electrical bio-impedance (BI) signal into two components: cardiac and respiratory. The decomposition of a BI signal is not a trivial process because of the non-stationarity of the signal components and overlapping of their harmonic spectra. An application sp...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/29/6/S02
更新日期:2008-06-01 00:00:00
abstract::Generalizability theory was used to investigate the score consistency of observed extracellular fluid/intracellular fluid (ECF/ICF) ratio measurements for both the global and leg-segmental bio-impedance spectroscopy methods. The test instrument used was a Xitron Hydra ECF/ICF Bio-Impedance Analyzer System, model 4200 ...
journal_title:Physiological measurement
pub_type: 杂志文章,随机对照试验
doi:10.1088/0967-3334/27/4/005
更新日期:2006-04-01 00:00:00
abstract::Myoelectrical pattern classification is a crucial part in multi-functional prosthesis control. This paper investigates a discriminant Fourier-derived cepstrum (DFC) and feature-level post-processing (FLPP) to discriminate hand and wrist motions using the surface electromyographic signal. The Fourier-derived cepstrum t...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/30/12/008
更新日期:2009-12-01 00:00:00
abstract:OBJECTIVE:Increased penetration of pulsatile power to the brain has been implicated in the pathogenesis of age-related cognitive dysfunction and dementia, a common comorbidity in patients with heart failure and preserved ejection fraction (HFpEF). However, there is a lack of knowledge on the effects of organic and inor...
journal_title:Physiological measurement
pub_type: 杂志文章,随机对照试验
doi:10.1088/1361-6579/aab2ef
更新日期:2018-04-20 00:00:00
abstract::Linear methods of reconstruction play an important role in medical electrical impedance tomography (EIT) and there is a wide variety of algorithms based on several assumptions. With the Graz consensus reconstruction algorithm for EIT (GREIT), a novel linear reconstruction algorithm as well as a standardized framework ...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/36/6/1161
更新日期:2015-06-01 00:00:00
abstract::This paper presents the design, construction and testing of a device to measure pressure-volume loops in the left ventricle of conscious, ambulatory rats. Pressure is measured with a standard sensor, but volume is derived from data collected from a tetrapolar electrode catheter using a novel admittance technique. Ther...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/32/6/007
更新日期:2011-06-01 00:00:00
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
doi:10.1088/0967-3334/32/11/N02
更新日期:2011-11-01 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::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
doi:10.1088/0967-3334/20/2/307
更新日期:1999-05-01 00:00:00
abstract::In order to detect minute amounts of glucose in diluted urine, we applied the Raman spectroscopy method. To simulate abnormal diluted urine in a toilet bowl, we diluted normal urine ten-fold with water and added glucose up to 8 mg dl(-1). Data were collected using a low-resolution Raman spectrometer that was preproces...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/28/5/011
更新日期:2007-05-01 00:00:00
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
doi:10.1088/0967-3334/27/1/005
更新日期:2006-01-01 00:00:00
abstract::Electrical impedance tomography (EIT) could be used as a portable non-invasive means to image the development of ischaemic stroke or haemorrhage. The purpose of this study was to examine if this was possible using time difference imaging, in the anesthetised rat using 40 spring-loaded scalp electrodes with applied con...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/37/6/765
更新日期:2016-06-01 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::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
doi:10.1088/0967-3334/14/4/007
更新日期:1993-11-01 00:00:00
abstract::A photoplethysmographic (PPG) signal can provide very useful information about a subject's cardiovascular status. Motion artifacts (MAs), which usually deteriorate the waveform of a PPG signal, severely obstruct its applications in the clinical diagnosis and healthcare area. To reduce the MAs from a PPG signal, in the...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/36/10/2159
更新日期:2015-10-01 00:00:00
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
doi:10.1088/1361-6579/ab0daa
更新日期:2019-04-03 00:00:00
abstract:OBJECTIVE:Metal exposures have been linked with many adverse health outcomes affecting nearly every system in the body. Exposure to metals has been tracked primarily using blood. Blood metal concentrations have drawbacks as biomarkers stemming from the metals' short biologic half-lives, shipping and storage requirement...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/1361-6579/aad947
更新日期:2018-08-31 00:00:00
abstract::An external electroenterogram (EEnG) is the recording of the small bowel myoelectrical signal using contact electrodes placed on the abdominal surface. It is a weak signal affected by possible movements and by the interferences of respiration and, principally, of the cardiac signal. In this paper an adaptive filtering...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/27/6/005
更新日期:2006-06-01 00:00:00
abstract::The pre-ejection period (PEP) has recently been described as a potential parameter for monitoring cardiac preload. This study further investigated the influence of changes in intravascular volume status and the application of positive end-expiratory pressure (PEEP) on the pre-ejection period. In ten pigs, ECG, arteria...
journal_title:Physiological measurement
pub_type: 杂志文章
doi:10.1088/0967-3334/26/6/012
更新日期:2005-12-01 00:00:00