Abstract:
:It is acknowledged that the first heart sound S1 consists of two major, high-frequency components M1 and T1, corresponding, respectively, to the vibrations of the mitral and tricuspid valves and their surrounding tissues following valve closure in early systole. In this study, the matching pursuit (MP) method was used to decompose S1 into a series of time-frequency atoms. M1 and T1 were separated from the parameterised atoms of S1. The first two dominant frequencies of M1 were identified and used as features of a linear classifier to diagnose mitral valve abnormality. This method was applied to two sets of S1 data recorded from 15 patients with normal, and 15 patients with abnormal, bioprosthetic mitral valves, respectively. It was found that the two features exhibit significant differences between the normal and abnormal sets (p< 0.001). Using these two features, a correct classification of 93% was obtained. In addition, when the Wigner distribution of S1 was calculated from the decomposed atoms and compared with a spectrogram, the MP method provided better results. The study demonstrates that the MP method may be a promising technique for heart sound analysis.
journal_name
Med Biol Eng Computjournal_title
Medical & biological engineering & computingauthors
Wang W,Guo Z,Yang J,Zhang Y,Durand LG,Loew Mdoi
10.1007/BF02345436keywords:
subject
Has Abstractpub_date
2001-11-01 00:00:00pages
644-8issue
6eissn
0140-0118issn
1741-0444journal_volume
39pub_type
杂志文章abstract::The present paper compares the performance of two Hilbert spectral analyses when applied to a synthetic RR series from a nonstationary integral pulse frequency modulation model and to real RR series from a dataset of normal sinus arrhythmia. The Hilbert-Huang transformation based on empirical mode decomposition is com...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-009-0500-x
更新日期:2009-10-01 00:00:00
abstract::The management of postprandial glucose excursions in type 1 diabetes has a major impact on overall glycaemic control. In this work, we propose and evaluate various mechanistic models to characterize the disposal of meal-attributable glucose. Sixteen young volunteers with type 1 diabetes were subject to a variable-targ...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-016-1509-6
更新日期:2017-02-01 00:00:00
abstract::The use of piezo-resistive uni-axial accelerometer signals in gait analysis is complicated by the fact that the measured signal is composed of different types of acceleration. The aim of the study is to obtain insight into the signal from a tangential accelerometer attached to the thigh during walking. Six subjects wa...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02344868
更新日期:2000-11-01 00:00:00
abstract::There is a lack of information regarding the forces required for suturing human wounds. The knowledge of suturing forces serves as complementary information for setting up the limiting geometry when using tissue adhesives and it might also be used in robot-assisted surgery. The main purpose of this paper was to evalua...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-011-0857-5
更新日期:2012-02-01 00:00:00
abstract::Electrical and mechanical stimulation of the oesophagus has been recently proposed to examine the physiological effects of autonomic stimulation in humans. Cortical evoked potentials (EPs) to oesophageal stimulation provide an assessment of afferent fibres and central processing. However, habituation takes place durin...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02534088
更新日期:1997-07-01 00:00:00
abstract::Respiratory rate (RR) is an important vital sign which can be difficult to measure accurately and unobtrusively in routine clinical practice. Pulse transit time (PTT), on the other hand, is unobtrusive to collect from electrocardiogram (ECG) and photoplethysmogram (PPG) signals. Using PTT is a novel method to estimate...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-019-02088-6
更新日期:2020-02-01 00:00:00
abstract::Osteoporosis is one of the most common diseases that leads to bone fractures. Dual-energy X-ray absorptiometry is currently employed to measure the bone mineral density and to diagnose osteoporosis. Alternatively, the dielectric properties of bones are found to be influenced by bone mineral density; hence, dielectric ...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章,评审
doi:10.1007/s11517-018-1887-z
更新日期:2019-01-01 00:00:00
abstract::This study introduced the Kalman filter procedure for tracking urinary bladder filling from intermittent bladder volume measurements taken by an ultrasonic bladder volume monitor. The Kalman filter was based on a double integrator as a model for the bladder filling process between micturitions and included a procedure...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02345809
更新日期:2005-05-01 00:00:00
abstract::Two ways of rate control for diaphragm pacing are proposed. One is rate control using only the patients' body temperature (method I). The other is rate control by both the patients' heart rate and body temperature (method II). To test the effectiveness of these methods, a diaphragm pacemaker which can be controlled by...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02446125
更新日期:1992-03-01 00:00:00
abstract::Hepatic echinococcosis (HE) is a life-threatening liver disease caused by parasites that requires a precise diagnosis and proper treatments. To assess HE lesions accurately, we propose a novel automatic HE lesion segmentation and classification network that contains lesion region positioning (LRP) and lesion region se...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-020-02126-8
更新日期:2020-03-01 00:00:00
abstract::This work addresses the problem of estimating the conduction velocity (CV) of single motor unit (MU) action potentials from surface EMG signals detected with linear electrode arrays during voluntary muscle contractions. In ideal conditions, that is without shape or scale changes of the propagating signals and with add...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02344807
更新日期:2001-03-01 00:00:00
abstract::The effectiveness of electrochemotherapy, a local treatment using electric pulses to increase the uptake of chemotherapeutic drug, includes several antitumor mechanisms. In addition to the cytotoxic action of chemotherapeutic drug, treatment outcome also depends on antitumor immune response. In order to assess the con...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-016-1562-1
更新日期:2017-07-01 00:00:00
abstract::The paper explains the application of a genetic algorithm (GA) to the problem of estimating parameters for a kinetic model of a biologically reacting system. It is demonstrated that the GA is a powerful tool for quantifying the kinetic parameters using kinetic data. As the operation of the GA does not depend on the fo...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02510391
更新日期:1997-01-01 00:00:00
abstract::Architectural distortion is a subtle abnormality in mammograms, and a source of overlooking errors by radiologists. Computer-aided diagnosis (CAD) techniques can improve the performance of radiologists in detecting masses and calcifications; however, most CAD systems have not been designed to detect architectural dist...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-006-0088-3
更新日期:2006-10-01 00:00:00
abstract::A building block-based software framework was developed to simulate electrophysiological networks. The synaptic potentials generated during neurotransmission were simulated in an existing discrete bidomain model of smooth muscle, using cubic, three-dimensional grids of varying sizes. The model is automatically derived...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02345322
更新日期:2003-09-01 00:00:00
abstract::Computer-based simulations of human hip joints generally include investigating contacts happening among soft or hard tissues during hip movement. In many cases, hip movement is approximated as rotation about an estimated hip center. In this paper, we investigate the effect of different methods used for estimating hip ...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-012-0873-0
更新日期:2012-06-01 00:00:00
abstract::The aim of this study was the analysis of the mechanical behaviour of a partially porous lumbar custom-made cage by means of a subject-specific finite element analysis (FEA). The cage, made of Ti6Al4V ELI alloy, was produced via electron beam melting (EBM) process and surgically implanted in a female subject, 50 years...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-019-02078-8
更新日期:2019-12-01 00:00:00
abstract::A generic framework for the automated classification of human movements using an accelerometry monitoring system is introduced. The framework was structured around a binary decision tree in which movements were divided into classes and subclasses at different hierarchical levels. General distinctions between movements...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02347551
更新日期:2004-09-01 00:00:00
abstract::From adult data, it is known that numerous factors, such as age, state of the autonomic nervous system, diurnal rhythms or mean R-R interval mRR, influence heart rate variability (HRV). The aim of this study was the examination of the influence of gestational age, mRR, gender and time of day on fetal HRV. The analysis...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02344729
更新日期:2005-07-01 00:00:00
abstract::Segmentation and classification of low-quality and noisy ultrasound images is challenging task. In this paper, a new approach is proposed for robust segmentation and classification of carotid artery ultrasound images and consequently, detecting cerebrovascular disease. The proposed technique consists of two phases, in...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-016-1481-1
更新日期:2016-12-01 00:00:00
abstract::Long periods of bed rest negatively affect the human body organs, notably the cardiovascular system. To avert these negative effects and promote functional recovery in patients dealing with prolonged bed rest, the goal is to mobilize them as early as possible while controlling and stabilizing their cardiovascular syst...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-017-1628-8
更新日期:2017-09-01 00:00:00
abstract::Divided attention is defined as focusing on different tasks at once, and this is described as one of the biggest problems of today's society. Default examinations for understanding attention are questionnaires or physiological signals, like evoked potentials and electroencephalography. Physiological records were obtai...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-019-02013-x
更新日期:2019-09-01 00:00:00
abstract::Fluctuation analysis has great potential to contribute to pulmonary clinical science and practice. We evaluated the relationship between asthma and the respiratory impedance recurrence period density entropy (RPDEnZrs) and the variability (SDZrs). A non-invasive and simple protocol for assessing respiratory mechanics ...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-012-0957-x
更新日期:2012-12-01 00:00:00
abstract::Steady-state visual evoked potentials (SSVEPs) are widely employed in brain-computer interface (BCI) applications, especially to control machines. However, the use of SSVEPs leads to eye fatigue and causes lower accuracy over the long term, particularly when multi-commands are required. Therefore, this paper proposes ...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-016-1560-3
更新日期:2017-06-01 00:00:00
abstract::Remote patient monitoring should reduce mortality rates, improve care, and reduce costs. We present an overview of the available technologies for the remote monitoring of chronic obstructive pulmonary disease (COPD) patients, together with the most important medical information regarding COPD in a language that is ada...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章,评审
doi:10.1007/s11517-018-1798-z
更新日期:2018-04-01 00:00:00
abstract::Bone mass and microarchitecture are the main determinants of bone strength. Three-dimensional micro-computed tomography has the potential to examine complete bones of small laboratory animals with very high resolution in a non-invasive way. In the presented work, the proximal part of the tibiae of hindlimb unloaded an...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02347054
更新日期:2000-05-01 00:00:00
abstract::Reactive hyperaemia is the term given to the temporary increase in blood flow that follows release of an occlusion of the arterial supply. Measurement of reactive hyperaemia in the leg below the knee is useful in assessment of the vascular system, as resting flows remain unaffected even in the presence of quite severe...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02515312
更新日期:1994-09-01 00:00:00
abstract::A multichannel biopotential amplifier for simultaneous use with biomagnetic measurements in a magnetically shielded room is designed and evaluated. Particular care is taken to make the amplifier electromagnetically compatible with the biomagnetic instruments over the whole frequency spectrum, from DC to RF. The electr...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02534098
更新日期:1997-07-01 00:00:00
abstract::Gait disturbances are common in the rat model of Parkinson's disease (PD) by administrating 6-hydroxydopamine. However, few studies have simultaneously assessed spatiotemporal gait indices and the kinematic information of PD rats during overground locomotion. This study utilized a simple, accurate, and reproducible me...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/s11517-012-0933-5
更新日期:2012-09-01 00:00:00
abstract::A method for the estimation of medium rate transitions of non-stationary electroencephalograms (EEG) is proposed. The method is applicable to such EEG dynamics that are between (a) fast transitions for which segmentation procedures are used and (b) slow transitions for which adaptive filters work properly. The estimat...
journal_title:Medical & biological engineering & computing
pub_type: 杂志文章
doi:10.1007/BF02513305
更新日期:1999-05-01 00:00:00