Abstract:
BACKGROUND:Shape of the dental root canal is highly patient specific. Automated identification methods of the medial line of dental root canals and the reproduction of their 3D shape can be beneficial for planning endodontic interventions as severely curved root canals or multi-rooted teeth may pose treatment challenges. Accurate shape information of the root canals may also be used by manufacturers of endodontic instruments in order to make more efficient clinical tools. METHOD:Novel image processing procedures dedicated to the automated detection of the medial axis of the root canal from dental micro-CT and cone-beam CT records are developed. For micro-CT, the 3D model of the root canal is built up from several hundred parallel cross sections, using image enhancement, histogram based fuzzy c-means clustering, center point detection in the segmented slice, three dimensional inner surface reconstruction, and potential field driven curve skeleton extraction in three dimensions. Cone-beam CT records are processed with image enhancement filters and fuzzy chain based regional segmentation, followed by the reconstruction of the root canal surface and detecting its skeleton via a mesh contraction algorithm. RESULTS:The proposed medial line identification and root canal detection algorithms are validated on clinical data sets. 25 micro-CT and 36 cone-beam-CT records are used in the validation procedure. The overall success rate of the automatic dental root canal identification was about 92% in both procedures. The algorithms proved to be accurate enough for endodontic therapy planning. CONCLUSIONS:Accurate medial line identification and shape detection algorithms of dental root canal have been developed. Different procedures are defined for micro-CT and cone-beam CT records. The automated execution of the subsequent processing steps allows easy application of the algorithms in the dental care. The output data of the image processing procedures is suitable for mathematical modeling of the central line. The proposed methods can help automate the preparation and design of several kinds of endodontic interventions.
journal_name
Biomed Eng Onlinejournal_title
Biomedical engineering onlineauthors
Benyó Bdoi
10.1186/1475-925X-11-81subject
Has Abstractpub_date
2012-10-29 00:00:00pages
81issn
1475-925Xpii
1475-925X-11-81journal_volume
11pub_type
杂志文章abstract:BACKGROUND:In literature, the effect of the inflow boundary condition was investigated by examining the impact of the waveform and the shape of the spatial profile of the inlet velocity on the cardiac hemodynamics. However, not much work has been reported on comparing the effect of the different combinations of the inl...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/1475-925X-14-S1-S6
更新日期:2015-01-01 00:00:00
abstract:BACKGROUND:Image quality assessment method of photoacoustic tomography has not been completely standardized yet. Due to the combined nature of photonic signal generation and ultrasonic signal transmission in biological tissue, neither optical nor ultrasonic traditional methods can be used without modification. An optic...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/1475-925X-11-37
更新日期:2012-07-13 00:00:00
abstract:BACKGROUND:Although use of a dynamic hip screw (DHS) for stable intertrochanteric hip fracture fixation has been successfully applied in fracture healing for more than 20 years, DHS fixation on unstable intertrochanteric fractures still has a high failure rate, especially in patients with osteoporosis. Although the wir...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/s12938-019-0663-0
更新日期:2019-04-24 00:00:00
abstract:BACKGROUND:Since the first well-known electrocardiogram (ECG) delineator based on Wavelet Transform (WT) presented by Li et al. in 1995, a significant research effort has been devoted to the exploitation of this promising method. Its ability to reliably delineate the major waveform components (mono- or bi-phasic P wave...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/1475-925X-10-23
更新日期:2011-04-03 00:00:00
abstract:BACKGROUND:The subjects in EEG-Brain computer interface (BCI) system experience difficulties when attempting to obtain the consistent performance of the actual movement by motor imagery alone. It is necessary to find the optimal conditions and stimuli combinations that affect the performance factors of the EEG-BCI syst...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/1475-925X-10-91
更新日期:2011-10-12 00:00:00
abstract:BACKGROUND:This paper proposes a methodology for helping bridge the gap between the complex waveform information frequently available in an intensive care unit and the simple, lumped values favoured for rapid clinical diagnosis and management. This methodology employs a simple waveform contour analysis approach to comp...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/s12938-018-0603-4
更新日期:2018-11-20 00:00:00
abstract::A large number of incommensurable metrics are currently used to report the performance of brain-computer interfaces (BCI) used for augmentative and alterative communication (AAC). The lack of standard metrics precludes the comparison of different BCI-based AAC systems, hindering rapid growth and development of this te...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/1475-925X-12-43
更新日期:2013-05-16 00:00:00
abstract:BACKGROUND:Parkinson's disease (PD) and essential tremor (ET) are the two most common movement disorders but the rate of misdiagnosis rate in these disorders is high due to similar characteristics of tremor. The purpose of the study is to present: (a) a solution to identify PD and ET patients by using the novel measure...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/s12938-015-0098-1
更新日期:2015-11-04 00:00:00
abstract:BACKGROUND:Endovascular intervention using a stent is a mainstream treatment for cerebral aneurysms. To assess the effect of intervention strategies on aneurysm hemodynamics, we have developed a fast virtual stenting (FVS) technique to simulate stent deployment in patient-specific aneurysms. However, quantitative valid...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/s12938-016-0250-6
更新日期:2016-12-28 00:00:00
abstract:BACKGROUND:The myocardium exhibits heterogeneous nature due to scarring after Myocardial Infarction (MI). In Cardiac Magnetic Resonance (CMR) imaging, Late Gadolinium (LG) contrast agent enhances the intensity of scarred area in the myocardium. METHODS:In this paper, we propose a probability mapping technique using Te...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/1475-925X-12-91
更新日期:2013-09-22 00:00:00
abstract:BACKGROUND:Voice disorders affect patients profoundly, and acoustic tools can potentially measure voice function objectively. Disordered sustained vowels exhibit wide-ranging phenomena, from nearly periodic to highly complex, aperiodic vibrations, and increased "breathiness". Modelling and surrogate data studies have s...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/1475-925X-6-23
更新日期:2007-06-26 00:00:00
abstract:BACKGROUND:Computational modeling of cardiovascular flow is a growing and useful field, but such simulations usually require the researcher to guess the flow's inlet and outlet conditions since they are difficult and expensive to measure. It is critical to determine the amount of uncertainty introduced by these assumpt...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/s12938-018-0497-1
更新日期:2018-05-30 00:00:00
abstract:PURPOSE:We propose a collaborative and secure transmission scheme in order to safely and efficiently transmit medical data and provide telemedicine services, lighten the load on wireless access networks, and improve the quality of medical treatment such as surgery. METHODS:First, the transmission technology based on o...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/s12938-019-0674-x
更新日期:2019-05-20 00:00:00
abstract:BACKGROUND:Neural stimulation is an important method used to activate or inhibit action potentials of the neuronal anatomical targets found in the brain, central nerve and peripheral nerve. The neural stimulator system produces biphasic pulses that deliver balanced charge into tissue from single or multichannel electro...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/s12938-017-0385-0
更新日期:2017-08-14 00:00:00
abstract:BACKGROUND:It is generally accepted that cartilage adaptation and degeneration are mechanically mediated. Investigating the swelling behaviour of cartilage is important because the stress and strain state of cartilage is associated with the swelling and deformation behaviour. It is well accepted that the swelling of so...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/1475-925x-1-8
更新日期:2002-12-19 00:00:00
abstract:BACKGROUND:The electroencephalography (EEG) signals are known to involve the firings of neurons in the brain. The P300 wave is a high potential caused by an event-related stimulus. The detection of P300s included in the measured EEG signals is widely investigated. The difficulties in detecting them are that they are mi...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/1475-925X-10-83
更新日期:2011-09-23 00:00:00
abstract:BACKGROUND:Electrical impedance tomography (EIT) has been used for functional lung imaging of regional air distributions during mechanical ventilation in intensive care units (ICU). From numerous clinical and animal studies focusing on specific lung functions, a consensus about how to use the EIT technique has been for...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/s12938-019-0701-y
更新日期:2019-07-25 00:00:00
abstract:BACKGROUND:Increasing evidence suggests that mechanisms governing advanced plaque progression may be different from those for early progression and require further investigation. Serial MRI data and 3D fluid-structure interaction (FSI) models were employed to identify possible correlations between mechanical stresses a...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/1475-925X-12-105
更新日期:2013-10-14 00:00:00
abstract:BACKGROUND:The evaluation, verification and comparison of different numerical heart models are difficult without a commonly available database that could be utilized as a reference. Our aim was to compile an exemplary dataset. METHODS:The following methods were employed: Magnetic Resonance Imaging (MRI) of heart and t...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/1475-925X-10-11
更新日期:2011-01-27 00:00:00
abstract:BACKGROUND:In order to characterize the intracranial pressure-volume reserve capacity, the correlation coefficient (R) between the ICP wave amplitude (A) and the mean ICP level (P), the RAP index, has been used to improve the diagnostic value of ICP monitoring. Baseline pressure errors (BPEs), caused by spontaneous shi...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/1475-925X-13-99
更新日期:2014-07-23 00:00:00
abstract:BACKGROUND:We and others have previously demonstrated that adipose-derived stem cells (ASCs) transplantation improve cardiac dysfunction post-myocardium infarction (MI) under hemodynamic stress in rats. The beneficial effects appear to be associated with pleiotropic factors due to a complex interplay between the transp...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/1475-925X-13-54
更新日期:2014-05-01 00:00:00
abstract:BACKGROUND:Human embryonic stem cells (hESCs) are a potential source of cells for use in regenerative medicine. Automation of culturing, monitoring and analysis is crucial for fast and reliable optimization of hESC culturing methods. Continuous monitoring of living cell cultures can reveal more information and is faste...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/1475-925X-6-11
更新日期:2007-04-12 00:00:00
abstract:BACKGROUND:The challenges of glycaemic control in critically ill patients have been debated for 20 years. While glycaemic control shows benefits inter- and intra-patient metabolic variability results in increased hypoglycaemia and glycaemic variability, both increasing morbidity and mortality. Hence, current recommenda...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/s12938-019-0720-8
更新日期:2019-10-22 00:00:00
abstract:BACKGROUND:The QRS complex is the most noticeable feature in the electrocardiogram (ECG) signal, therefore, its detection is critical for ECG signal analysis. The existing detection methods largely depend on hand-crafted manual features and parameters, which may introduce significant computational complexity, especiall...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/s12938-018-0441-4
更新日期:2018-01-29 00:00:00
abstract:OBJECTIVE:The purpose of this study was to show the effects of the tracheal gas insufflation (TGI) technique on gas exchange using helium-oxygen mixtures during high-frequency oscillatory ventilation (HFOV). We hypothesized that a helium-oxygen mixture delivered into the trachea using the TGI technique (0.3 L/min) woul...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/1475-925X-12-29
更新日期:2013-04-08 00:00:00
abstract:BACKGROUND:In stent design optimization, the functional relationship between design parameters and design goals is nonlinear, complex, and implicit and the multi-objective design of stents involves a number of potentially conflicting performance criteria. Therefore it is hard and time-consuming to find the optimal desi...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/s12938-016-0268-9
更新日期:2016-12-28 00:00:00
abstract:BACKGROUND:It is a known fact that blood flow pattern and more specifically the pulsatile time variation of shear stress on the vascular wall play a key role in atherogenesis. The paper presents the conception, the building and the control of a new in vitro test bench that mimics the pulsatile flows behavior based on i...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/s12938-015-0065-x
更新日期:2015-08-07 00:00:00
abstract:BACKGROUND:Reach-grasp movements are motor components commonly affected after stroke and directly related to the independence of these individuals. Evaluations of these activities can be performed using clinical instruments and assessed by detailed and costly kinematic analyses. The aim of this study was to develop an ...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/s12938-020-0758-7
更新日期:2020-03-04 00:00:00
abstract:BACKGROUND:The structure of the anatomical surfaces, e.g., CSF and gray and white matter, could severely influence the flow of volume currents in a head model. This, in turn, will also influence the scalp potentials and the inverse source localizations. This was examined in detail with four different human head models....
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/1475-925X-5-10
更新日期:2006-02-08 00:00:00
abstract:BACKGROUND:Analysis of heart rate variation (HRV) has become a popular noninvasive tool for assessing the activities of the autonomic nervous system (ANS). HRV analysis is based on the concept that fast fluctuations may specifically reflect changes of sympathetic and vagal activity. It shows that the structure generati...
journal_title:Biomedical engineering online
pub_type: 杂志文章
doi:10.1186/1475-925X-3-24
更新日期:2004-07-20 00:00:00