Abstract：
:The alpha angle is a parameter extensively used to assess for cam-type femoroacetabular impingement (FAI) in a 2D image of the hip. As this angle requires estimation of the axis of the femoral neck, the drawing of this axis often results in measurement errors due to subjective judgment, influencing inter-rater and intra-rater agreements. In the present study, sampling points were captured from the edges of a femoral neck and head in the 2D image, and the best curves of the two were fitted respectively by using the curve fitting method. The morphology of the femoral neck was outlined by two polynomials, and the femoral head was represented by an equation of a circle. By means of the proposed method, the results reveal that the inter-rater ICCs in X-ray and MRI were respectively 0.905 and 0.969, and the intra-rater ICCs in X-ray and MRI were respectively 0.892 and 0.840. The Bland-Altman plot shows that the values obtained by the proposed method and the conventional method were not consistent; nevertheless, the linear regression analysis indicated the two measurement results had a significant association (p < 0.001). This study provides a repeatable and agreed α angle measuring method, which contributes to identifying normal and abnormal femoral head-neck morphologies. The proposed numerical method would contribute to diagnose early FAI.
journal_name
Med Biol Eng Computjournal_title
Medical & biological engineering & computingauthors
Lai CL,Chi WM,Ho YJ,Lin CC,Lin HC,Kuo CL,Chen JHdoi
10.1007/s11517-019-01973-4subject
Has Abstractpub_date
2019-07-01 00:00:00pages
1525-1535issue
7eissn
0140-0118issn
1741-0444pii
10.1007/s11517-019-01973-4journal_volume
57pub_type
杂志文章abstract：:Parkinson's disease (PD) is a neurodegenerative disease of the central nervous system that results from the degeneration of dopaminergic neurons in the substantia nigra. Abnormal gait begins in the early stage and becomes severe as the disease progresses; therefore, the assessment of gait becomes an important issue in...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/s11517-015-1335-2
更新日期：2016-03-01 00:00:00
abstract：:Left ventricular assist device (LVAD) support unloads left ventricular (LV) pressure and volume and decreases wall stress. This study investigated the effect of systematic LVAD unloading on the 3-dimensional myocardial wall stress by employing finite element models containing layered fiber structure, active contractil...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/s11517-014-1205-3
更新日期：2014-12-01 00:00:00
abstract：:A biphasic continuum model for the flow of intraocular fluid, the aqueous humour, in the trabecular meshwork is proposed in the paper. The model considers the meshwork as a circular ring with uniform thickness of homogeneous, isotropic, viscoelastic material swollen with continuously percolating aqueous humour. The mo...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/BF02446710
更新日期：1991-05-01 00:00:00
abstract：:The purpose of this study is to investigate the change in biomechanical milieu following removal of pedicle screws in instrumented single level lumbar arthrodesis. Using a validated finite element (FE) model of the intact lumbar spine (L2-5), two scenarios of L3-4 lumbar fusion were simulated: posterolateral fusion (P...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/s11517-010-0621-2
更新日期：2010-07-01 00:00:00
abstract：:Quantitative analysis and detection of electroencephalogram (EEG) recordings during evoked activities is essential for clinical diagnosis on neurological disorders. However, the process of interpreting EEG is time consuming for electroencephalographers (EEGers). In this study, an automatic EEG interpretation system co...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/s11517-010-0688-9
更新日期：2011-02-01 00:00:00
abstract：:A personal computer system for electrocardiogram (ECG) ST-segment recognition is developed based on neural networks. The system consists of a preprocessor, neural networks and a recogniser. The adaptive resonance theory (ART) is employed to implement the neural networks in the system, which self-organise in response t...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/BF02446186
更新日期：1992-01-01 00:00:00
abstract：:Even though the World Health Organization criteria's for classifying the dengue infection have been used for long time, recent studies declare that several difficulties have been faced by the clinicians to apply these criteria. Accordingly, many studies have proposed modified criteria to identify the risk in dengue pa...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/s11517-009-0561-x
更新日期：2010-03-01 00:00:00
abstract：:A new method of quantifying dermal perfusion on a regional basis using a dynamic thermographic technique is investigated. The technique is based on the relationship between dermal perfusion and the rate of skin surface reheating following the application of a transient cold challenge predicted by a theoretical model. ...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/BF02441468
更新日期：1989-09-01 00:00:00
abstract：:Over a period of some years, the components of a system for discerning erosion on children's teeth have been progressively developed, for use in an extensive project seeking correlations between erosion and various perceived risk factors. The aim was the detection of minute levels of erosion, based on mappings of the ...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/BF02348090
更新日期：2003-07-01 00:00:00
abstract：:Vertebral fractures are common in children with osteogenesis imperfecta (OI). Current imaging methods for fracture detection (X-ray and DXA) use ionising radiation. This pilot study explored whether the alteration in blood flow in vertebral fractures results in skin temperature changes that may be detected using high ...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/s11517-018-1806-3
更新日期：2018-09-01 00:00:00
abstract：:OKAS-3D is a further development of the single floating circle target tracker. This tracker consists of a cathode ray tube display, a lens in front of the display and a circular light-sensitive photocell placed in the image field of the lens. A small circular trace generated on the screen is focused around the photoce...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/BF02510786
更新日期：1995-09-01 00:00:00
abstract：:Respiratory sinus arrhythmia (RSA) is the variation of heart rate (or RR interval) in phase with respiration and has been extensively studied. However, the effect of respiration on atrioventricular conduction delay (and hence PR interval length) has not yet received much attention. This work reports on measurements of...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/BF02345298
更新日期：2002-11-01 00:00:00
abstract：:A new algorithm to resolve superimposed motor unit action potentials (MUAPs) is described, which uses a reduced search space and is based on the peel off approach. Knowledge specific to the problem domain, such as temporal relationships between and within motor unit action potential trains and MUAP energy information,...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/BF02637020
更新日期：1996-01-01 00:00:00
abstract：:The regulation of cerebral blood flow (CBF) following changes in arterial blood pressure (ABP) and end-tidal pCO2 (EtCO2) are of clinical interest in assessing cerebrovascular reserve capacity. Linear finite-impulse-response modelling is applied to ABP, EtCO2 and CBF velocity (CBFV, from transcranial Doppler measureme...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/BF02345749
更新日期：2000-09-01 00:00:00
abstract：:While matrix remodeling plays a key role in vascular physiology and pathology, the underlying mechanisms have remained incompletely understood. We studied the remodeling of collagen matrices by individual vascular smooth muscle cells (SMCs), clusters and monolayers. In addition, we focused on the contribution of trans...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/s11517-012-0916-6
更新日期：2012-07-01 00:00:00
abstract：:The paper describes a method of quantifying Duchenne muscular dystrophy which is examiner independent and uses surface electromyographic signals (EMG). A standardised protocol is proposed. Spectral parameters are first computed from digitised EMG, then a polynomial model is deduced from the evolution of each parameter...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/BF02446966
更新日期：1992-05-01 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：:Pre-operative diagnosis of chest-wall deformity is important for successful surgical correction and post-operative evaluation of funnel chest patients. However, conventional indices that define the severity of deformity have several limitations; manually calculated and cannot supply information about asymmetry. We dev...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/s11517-008-0367-2
更新日期：2008-08-01 00:00:00
abstract：:Several 3D reconstruction techniques deriving from stereoradiographic DLT have been presented during the last 15 years, but these techniques have usually been limited in accuracy because of the small number of corresponding anatomical landmarks identified on both radiographs. A new technique has recently been proposed...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/BF02344797
更新日期：2001-03-01 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 system, to collect, analyse and display biological data, is developed using IBM PC AT compatibles (PCs) or CED1401/1609 devices networked to a VAX environment. It can be operated in three separate modes: using the CED/IEEE/VAX network; using the PC/Ethernet/VAX network; as a standalone PC. The original system compri...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/BF02446881
更新日期：1993-01-01 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：:Pain control in conscious patients was investigated using a push-button, demand-driven supply of drugs. A fuzzy logic patient-controlled analgesia (PCA) algorithm was compared with a conventional algorithm, for alfentanil administration in extracorporeal shock-wave lithotripsy. The conventional PCA algorithm used an i...
journal_title：Medical & biological engineering & computing
pub_type： 临床试验,杂志文章
doi：10.1007/BF02347706
更新日期：2002-01-01 00:00:00
abstract：:In this paper, we proposed to utilize a novel spatio-spectral filter, common spatio-spectral pattern (CSSP), to improve the classification accuracy in identifying intended motions based on low-density surface electromyography (EMG). Five able-bodied subjects and a transradial amputee participated in an experiment of e...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/s11517-012-1024-3
更新日期：2013-05-01 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：:Detailed finite element (FE) models are used as promising tools to investigate traumatic brain injuries, although their accuracy is strongly dependent on the characterization of the mechanical behaviors of the different anatomic structures in the brain. In some cases, when the FE models require finer spatial resolutio...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/s11517-018-1891-3
更新日期：2019-03-01 00:00:00
abstract：:The Delft Shoulder and Elbow Model (DSEM), a musculoskeletal model of the shoulder and elbow has been extensively developed since its introduction in 1994. Extensions cover both model structures and anatomical data focusing on the addition of an elbow part and muscle architecture parameters. The model was also extende...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/s11517-011-0839-7
更新日期：2011-12-01 00:00:00
abstract：:The role of alveolar macrophages in the process of the human lung clearance is summarised. Three patterns of alveolar macrophage (AM) displacement on the surface of alveolus are distinguished depending on the loading of the surface with insoluble deposits, i.e. directional, directional with small stochastic noise and ...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/BF02522517
更新日期：1995-07-01 00:00:00
abstract：:Magnetic nanoparticles for therapy and diagnosis are at the leading edge of the rapidly developing field of bionanotechnology. In this study, we have theoretically studied motion of magnetic nano- as well as micro-particles in the field of cylindrical Halbach array of permanent magnets. Magnetic flux density was model...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/s11517-010-0636-8
更新日期：2010-08-01 00:00:00
abstract：:In the present study, well known scale-space filtering (SSF) algorithm is used in combination with a linear mapping approach (LMA) to obtain clear auditory evoked potential (EP) waveform. The proposed combination involves two sequential steps: At first, the EEG noise level is reduced from -5 to 0 dB owing to the LMA b...
journal_title：Medical & biological engineering & computing
pub_type： 杂志文章
doi：10.1007/s11517-009-0450-3
更新日期：2009-04-01 00:00:00
