Medicine RSS Search Engine

Biomedical Engineering

This page shows you the most recent publications within this specialty of the MedWorm directory. This is page number 13.

Abnormal Dynamics of EEG Oscillations in Schizophrenia Patients on Multiple Time Scales
This study aims to reveal the abnormal amplitude dynamics of electroencephalogram (EEG) oscillations in schizophrenia patients on multiple time scales. EEGs were recorded from schizophrenia patients ($n$ = 19) and healthy controls ($n$ = 16) while they were at resting state with eyes closed, at resting state with eyes open, and at watching video. Detrended fluctuation analysis and measures of life-time and waiting-time were used to characterize the abnormal dynamics of EEG oscillations on both long (1–20 s) and short (≤1 s) time scales. Abnormal dynamics of EEG oscillations in alph...
Source: IEEE Transactions on Biomedical Engineering - May 20, 2014 Category: Biomedical Engineering Source Type: research

Differentiating Between Psychogenic Nonepileptic Seizures and Epilepsy Based on Common Spatial Pattern of Weighted EEG Resting Networks
In this study, we develop an approach for discriminating between PNES and epilepsy using the common spatial pattern extracted from the brain network topology (SPN). The study reveals that 92% accuracy, 100% sensitivity, and 80% specificity were reached for the classification between PNES and focal epilepsy. The newly developed SPN of resting EEG may be a promising tool to mine implicit information that can be used to differentiate PNES from epilepsy. (Source: IEEE Transactions on Biomedical Engineering)
Source: IEEE Transactions on Biomedical Engineering - May 20, 2014 Category: Biomedical Engineering Source Type: research

A Reconstruction Algorithm of Magnetoacoustic Tomography With Magnetic Induction for an Acoustically Inhomogeneous Tissue
In this study, we proposed a new algorithm for MAT-MI to image the impedance distribution in tissues with inhomogeneous acoustic speed distributions. With a computer head model constructed from MR images of a human subject, a series of numerical simulation experiments were conducted. The present results indicate that the inhomogeneous acoustic properties of tissues in terms of speed variation can be incorporated in MAT-MI imaging. (Source: IEEE Transactions on Biomedical Engineering)
Source: IEEE Transactions on Biomedical Engineering - May 20, 2014 Category: Biomedical Engineering Source Type: research

A Nonlinear Mapping Approach to Stain Normalization in Digital Histopathology Images Using Image-Specific Color Deconvolution
Histopathology diagnosis is based on visual examination of the morphology of histological sections under a microscope. With the increasing popularity of digital slide scanners, decision support systems based on the analysis of digital pathology images are in high demand. However, computerized decision support systems are fraught with problems that stem from color variations in tissue appearance due to variation in tissue preparation, variation in stain reactivity from different manufacturers/batches, user or protocol variation, and the use of scanners from different manufacturers. In this paper, we present a novel approach...
Source: IEEE Transactions on Biomedical Engineering - May 20, 2014 Category: Biomedical Engineering Source Type: research

Feasibility of Real-Time Workflow Segmentation for Tracked Needle Interventions
Computer-assisted training systems promote both training efficacy and patient health. An important component for providing automatic feedback in computer-assisted training systems is workflow segmentation: the determination of what task in the workflow is being performed. Our objective was to develop a workflow segmentation algorithm for needle interventions using needle tracking data. Needle tracking data were collected from ultrasound-guided epidural injections and lumbar punctures, performed by medical personnel. The workflow segmentation algorithm was tested in a simulated real-time scenario: the algorithm was only all...
Source: IEEE Transactions on Biomedical Engineering - May 20, 2014 Category: Biomedical Engineering Source Type: research

Microwave Ablation at 10.0 GHz Achieves Comparable Ablation Zones to 1.9 GHz in Ex Vivo Bovine Liver
We demonstrate the feasibility of using high-frequency microwaves for tissue ablation by comparing the performance of a 10 GHz microwave ablation system with that of a 1.9 GHz system. Two sets of floating sleeve dipole antennas operating at these frequencies were designed and fabricated for use in ex vivo experiments with bovine livers. Combined electromagnetic and transient thermal simulations were conducted to analyze the performance of these antennas. Subsequently, a total of 16 ablation experiments (eight at 1.9 GHz and eight at 10.0 GHz) were conducted at a power level of 42 W for either 5 or 10&#...
Source: IEEE Transactions on Biomedical Engineering - May 20, 2014 Category: Biomedical Engineering Source Type: research

Hypnogram and Sleep Parameter Computation From Activity and Cardiovascular Data
The automatic computation of the hypnogram and sleep Parameters, from the data acquired with portable sensors, is a challenging problem with important clinical applications. In this paper, the hypnogram, the sleep efficiency (SE), rapid eye movement (REM), and nonREM (NREM) sleep percentages are automatically estimated from physiological (ECG and respiration) and behavioral (Actigraphy) nocturnal data. Two methods are described; the first deals with the problem of the hypnogram estimation and the second is specifically designed to compute the sleep parameters, outperforming the traditional estimation approach based on the ...
Source: IEEE Transactions on Biomedical Engineering - May 20, 2014 Category: Biomedical Engineering Source Type: research

A Nonlinear Generalization of Spectral Granger Causality
In this study, it is shown that the classical Geweke's spectral causality measure can be explicitly linked with the output spectra of corresponding restricted and unrestricted time-domain models. The latter representation is then generalized to nonlinear bivariate signals and for the first time nonlinear causality analysis in the frequency domain. This is achieved by using the nonlinear ARX (NARX) modeling of signals, and decomposition of the recently defined output frequency response function which is related to the NARX model. (Source: IEEE Transactions on Biomedical Engineering)
Source: IEEE Transactions on Biomedical Engineering - May 20, 2014 Category: Biomedical Engineering Source Type: research

Combining Conformal Deformation and Cook–Torrance Shading for 3-D Reconstruction in Laparoscopy
We propose a new monocular 3-D reconstruction method adapted for reconstructing organs in the abdominal cavity. It combines both motion and shading cues. The former uses a conformal deformation prior and the latter the Cook–Torrance reflectance model. Our method runs in two phases: first, a 3-D geometric and photometric template of the organ at rest is reconstructed in vivo. The geometric shape is reconstructed using rigid shape-from-motion while the surgeon is exploring—but not deforming—structures in the abdominal cavity. This geometric template is then used to retrieve the photometric properties. A ...
Source: IEEE Transactions on Biomedical Engineering - May 20, 2014 Category: Biomedical Engineering Source Type: research

Continuous Wave Simulations on the Propagation of Electromagnetic Fields Through the Human Head
Characterizing the human head as a propagation medium is vital for the design of both on-body and implanted antennas and radio-frequency sensors. The following problem has been addressed: find the best radio-frequency path through the brain for a given receiver position—on the top of the sinus cavity. Two parameters, transmitter position and radiating frequency, should be optimized simultaneously such that 1) the propagation path through the brain is the longest; and 2) the received power is maximized. To solve this problem, we have performed a systematic and comprehensive study of the electromagnetic fields excited...
Source: IEEE Transactions on Biomedical Engineering - May 20, 2014 Category: Biomedical Engineering Source Type: research

Learning to Detect Vocal Hyperfunction From Ambulatory Neck-Surface Acceleration Features: Initial Results for Vocal Fold Nodules
Voice disorders are medical conditions that often result from vocal abuse/misuse which is referred to generically as vocal hyperfunction. Standard voice assessment approaches cannot accurately determine the actual nature, prevalence, and pathological impact of hyperfunctional vocal behaviors because such behaviors can vary greatly across the course of an individual's typical day and may not be clearly demonstrated during a brief clinical encounter. Thus, it would be clinically valuable to develop noninvasive ambulatory measures that can reliably differentiate vocal hyperfunction from normal patterns of vocal behavio...
Source: IEEE Transactions on Biomedical Engineering - May 20, 2014 Category: Biomedical Engineering Source Type: research

Noninvasive Imaging of the High Frequency Brain Activity in Focal Epilepsy Patients
This study also indicates the potential application of studying HF activity in the presurgical planning of medically intractable epilepsy patients. (Source: IEEE Transactions on Biomedical Engineering)
Source: IEEE Transactions on Biomedical Engineering - May 20, 2014 Category: Biomedical Engineering Source Type: research

Behavioral Characteristics of Manual Palpation to Localize Hard Nodules in Soft Tissues
Improving the effectiveness of artificial tactile sensors for soft-tissue examination and tumor localization is a pressing need in robot-assisted minimally invasive surgery. Despite the availability of tactile probes, guidelines for optimal palpation behavior that best exploit soft-tissue properties are not available as yet. Simulations on soft-tissue palpation show that particular stress–velocity patterns during tissue probing lead to constructive dynamic interactions between the probe and the tissue, enhancing the detection and localization of hard nodules. To the best of our knowledge, this is the first attempt t...
Source: IEEE Transactions on Biomedical Engineering - May 20, 2014 Category: Biomedical Engineering Source Type: research

Comparison of a Single Optimized Coil and a Helmholtz Pair for Magnetic Nanoparticle Hyperthermia
Magnetic nanoparticles in a tumor can induce therapeutic heating when energized by an alternating magnetic field from a current-carrying coil outside the body. We analyzed a single-turn, air-core coil carrying a filamentary current to quantify the power absorbed by: a) magnetic nanoparticles at depth in tissue and b) superficial tissue in response to induced eddy currents; we defined this quotient as power ratio (PR). Given some limit on the eddy current heating tolerated by an alert patient, maximizing the PR maximizes the power absorbed in the tumor; all else being equal, this increases the thermal dose delivered to the ...
Source: IEEE Transactions on Biomedical Engineering - May 20, 2014 Category: Biomedical Engineering Source Type: research

Automated Removal of EKG Artifact From EEG Data Using Independent Component Analysis and Continuous Wavelet Transformation
The electrical potential produced by the cardiac activity sometimes contaminates electroencephalogram (EEG) recordings, resulting in spiky activities that are referred to as electrocardiographic (EKG) artifact. For a variety of reasons it is often desirable to automatically detect and remove these artifacts. Especially, for accurate source localization of epileptic spikes in an EEG recording from a patient with epilepsy, it is of great importance to remove any concurrent artifact. Due to similarities in morphology between the EKG artifacts and epileptic spikes, any automated artifact removal algorithm must have an extremel...
Source: IEEE Transactions on Biomedical Engineering - May 20, 2014 Category: Biomedical Engineering Source Type: research

Investigating the Role of Vibrotactile Noise in Early Response to Perturbation
In conclusion, the application of subthreshold vibrotactile noise enhanced persons’ muscle reaction time to handle perturbation and led to early recovery from the perturbation. Use of the vibrotactile noise may increase a person's ability to rapidly respond to perturbation of a grasped object in potentially dangerous situations such as holding onto ladder rungs from elevation or manipulating knives. (Source: IEEE Transactions on Biomedical Engineering)
Source: IEEE Transactions on Biomedical Engineering - May 20, 2014 Category: Biomedical Engineering Source Type: research

Fast X-Ray Luminescence Computed Tomography Imaging
X-ray luminescence computed tomography (XLCT) opens new possibilities to perform molecular imaging with X-ray. However, challenges remain in dynamic XLCT imaging, where short scan time, good spatial resolution, and whole-body field of view should be considered simultaneously. In this paper, by the use of a single-view XLCT reconstruction method based on a compressive sensing (CS) technique, incorporating a cone beam XLCT imaging system, we implement fast 3-D XLCT imaging. To evaluate the performance of the method, two types of phantom experiments were performed based on a cone beam XLCT imaging system. In Case 1, one tube ...
Source: IEEE Transactions on Biomedical Engineering - May 20, 2014 Category: Biomedical Engineering Source Type: research

Designing MR Shim Arrays With Irregular Coil Geometry: Theoretical Considerations
In magnetic resonance imaging and spectroscopy, a highly uniform magnetic field is desired for minimizing image distortions and line broadening, respectively. Typically, shim coils are employed to provide correcting fields for inhomogeneities brought about by magnetic interactions with the sample under study. Flexible field modeling is possible using an array of regularly shaped conducting loops that are independently electrically driven. In this paper, a design method is presented for generating coil winding patterns for shim arrays with irregular geometry elements. These designs are compared theoretically to the use of c...
Source: IEEE Transactions on Biomedical Engineering - May 20, 2014 Category: Biomedical Engineering Source Type: research

Ventricular Fibrillation and Tachycardia Classification Using a Machine Learning Approach
Correct detection and classification of ventricular fibrillation (VF) and rapid ventricular tachycardia (VT) is of pivotal importance for an automatic external defibrillator and patient monitoring. In this paper, a VF/VT classification algorithm using a machine learning method, a support vector machine, is proposed. A total of 14 metrics were extracted from a specific window length of the electrocardiogram (ECG). A genetic algorithm was then used to select the optimal variable combinations. Three annotated public domain ECG databases (the American Heart Association Database, the Creighton University Ventricular Tachyarrhyt...
Source: IEEE Transactions on Biomedical Engineering - May 20, 2014 Category: Biomedical Engineering Source Type: research

Table of contents
Presents the table of contents for this issue of the periodical. (Source: IEEE Transactions on Biomedical Engineering)
Source: IEEE Transactions on Biomedical Engineering - May 20, 2014 Category: Biomedical Engineering Source Type: research

[Front cover]
Presents the front cover for this issue of the publication. (Source: IEEE Transactions on Biomedical Engineering)
Source: IEEE Transactions on Biomedical Engineering - May 20, 2014 Category: Biomedical Engineering Source Type: research

IEEE Transactions on Biomedical Engineering publication information
Provides a listing of current staff, committee members and society officers. (Source: IEEE Transactions on Biomedical Engineering)
Source: IEEE Transactions on Biomedical Engineering - May 20, 2014 Category: Biomedical Engineering Source Type: research

Power generation from cassava alcohol wastewater: effects of pretreatment and anode aeration.
Abstract Cassava alcohol wastewater produced from the bioethanol production industry is carbohydrate-rich wastewater with large quantities of insoluble organic compounds. Microbial fuel cells (MFCs) were used for electricity recovery and pollutants removal from this wastewater. Different pretreatment methods (solid-liquid separation, ultrasonication, pre-fermentation) and anode-aeration modes were explored in MFCs aimed to enhance the efficiency of power generation and pollutants removal. Pre-fermentation was found to be the most effective pretreatment method. A maximum power density of 437.13 ± 15.6 mW/m(2) an...
Source: Bioprocess and Biosystems Engineering - May 20, 2014 Category: Biomedical Engineering Authors: Quan X, Tao K, Mei Y, Jiang X Tags: Bioprocess Biosyst Eng Source Type: research

Biosynthesis, characterization and antimicrobial activity of silver nanoparticles by Streptomyces sp. SS2.
Abstract In the present study the microbial biosynthesis of silver nanoparticles (AgNPs) by secondary metabolites of Streptomyces sp. SS2 in an eco-friendly approach has been reported. The Streptomyces sp. SS2 was isolated from the soil sediment of Similipal Biosphere Reserve. The identification of this strain was determined by phenotypical characteristics (morphological and biochemical) and molecular characterization method using 16 s rDNA sequencing. The morphological study was also done by high-resolution scanning electron microscopy. The preliminary characterization of biosynthesized silver nanoparticle was ca...
Source: Bioprocess and Biosystems Engineering - May 20, 2014 Category: Biomedical Engineering Authors: Mohanta YK, Behera SK Tags: Bioprocess Biosyst Eng Source Type: research

Editorial Board
(Source: Medical Engineering and Physics)
Source: Medical Engineering and Physics - May 19, 2014 Category: Biomedical Engineering Source Type: research

EMG feature assessment for myoelectric pattern recognition and channel selection: A study with incomplete spinal cord injury
Abstract: Myoelectric pattern recognition with a large number of electromyogram (EMG) channels provides an approach to assessing motor control information available from the recorded muscles. In order to develop a practical myoelectric control system, a feature dependent channel reduction method was developed in this study to determine a small number of EMG channels for myoelectric pattern recognition analysis. The method selects appropriate raw EMG features for classification of different movements, using the minimum Redundancy Maximum Relevance (mRMR) and the Markov random field (MRF) methods to rank a large number of EM...
Source: Medical Engineering and Physics - May 19, 2014 Category: Biomedical Engineering Authors: Jie Liu, Xiaoyan Li, Guanglin Li, Ping Zhou Tags: Technical Notes Source Type: research

An integrative process of bioconversion of oil palm empty fruit bunch fiber to ethanol with on-site cellulase production.
Abstract The aim of this study was to efficiently convert oil palm empty fruit bunch fiber (OPEFB), one of the most commonly generated lingo-wastes in Southeast Asia, into both cellulase and bioethanol. The unprocessed cellulase crude (37.29 %) produced under solid-state fermentation using OPEFB as substrate showed a better reducing sugar yield using filter paper than the commercial enzyme blend (34.61 %). Organosolv pretreatment method could efficiently reduce hemicellulose (24.3-18.6 %) and lignin (35.2-22.1 %) content and increase cellulose content (40.5-59.3 %) from OPEFB. Enzymatic hydrolysis of pretreate...
Source: Bioprocess and Biosystems Engineering - May 18, 2014 Category: Biomedical Engineering Authors: Zhu Y, Xin F, Zhao Y, Chang Y Tags: Bioprocess Biosyst Eng Source Type: research

Autophagy Regulates Vascular Endothelial Cell eNOS and ET-1 Expression Induced by Laminar Shear Stress in an Ex Vivo Perfused System.
Abstract Vascular endothelial cell function responds to steady laminar shear stress; however, the underlying mechanisms are not fully elucidated. In the present study, we examined the effect of steady laminar shear stress on vascular endothelial cell autophagy and endothelial cell nitric oxide synthase (eNOS) and endothelin-1 (ET-1) expression using an ex vivo perfusion system. Human vascular endothelial cells and common arteries of New Zealand rabbits were pretreated with or without rapamycin or 3-MA for 30 min. These were then placed in an ex vivo cell perfusion system or an ex vivo organ perfusion system under ...
Source: Annals of Biomedical Engineering - May 17, 2014 Category: Biomedical Engineering Authors: Guo F, Li X, Peng J, Tang Y, Yang Q, Liu L, Wang Z, Jiang Z, Xiao M, Ni C, Chen R, Wei D, Wang GX Tags: Ann Biomed Eng Source Type: research