Detection of a and b waves in the acceleration photoplethysmogram
Source, September 24, 2014
Background: Analyzing acceleration photoplethysmogram (APG) signals measured after exercise is challenging. In this paper, a novel algorithm that can detect a waves and consequently b waves under these conditions is proposed. Accurate a and b wave detection is an important first step for the assessm...
Heart rate variability analysis using robust period detection
Source, September 23, 2014
ObjectiveHeart rate variability (HRV) analysis, which is an important tool for activity assessment of the cardiac autonomic nervous system, very often includes the estimation of power spectra for series of interbeat intervals (IBI). Ectopic beats and artifacts have a destructive effect on the standa...
Noninvasive measurement of cardiac stroke volume using pulse wave velocity and aortic dimensions: a simulation study
Source, September 19, 2014
Background: Concerns about the cost-effectiveness of invasive hemodynamic monitoring in critically ill patients using pulmonary artery catheters motivate a renewed search for effective noninvasive methods to measure stroke volume. This paper explores a new approach based on noninvasively measured pu...
A facile in vitro model to study rapid mineralization in bone tissues
Source, September 15, 2014
Background: Mineralization in bone tissue involves stepwise cell-cell and cell-ECM interaction. Regulation of osteoblast culture microenvironments can tailor osteoblast proliferation and mineralization rate, and the quality and/or quantity of the final calcified tissue. An in vitro model to investig...
An active compression bandage based on shape memory alloys: a preliminary investigation
Source, September 11, 2014
Background: Disorders associated with excessive swelling of the lower extremities are common. They can be associated with pain, varicose veins, reduced blood pressure when standing and may cause syncope or fainting. The common physical remedy to these disorders is the use of compression stockings an...
Comparison of Measurements of Mandible Growth using Cone Beam Computed Tomography and its Synthesized Cephalograms
Source, September 10, 2014
Background: The current study aimed to compare the measurements of the mandible morphology using 3D cone beam computed tomography (CBCT) images with those using 2D CBCT-synthesized cephalograms; to quantify errors in measurements based on 2D synthesized cephalograms; and to clarify the effects such ...
Biomechanics principle of elbow joint for transhumeral prostheses: comparison of normal hand, body-powered, myoelectric & air splint prostheses
Source, September 10, 2014
Background: Understanding of kinematics force applied at the elbow is important in many fields, including biomechanics, biomedical engineering and rehabilitation. This paper provides a comparison of a mathematical model of elbow joint using three different types of prosthetics for transhumeral user,...
A regularization-free elasticity reconstruction method for ultrasound elastography with freehand scan
Source, September 06, 2014
Background: In ultrasound elastography, reconstruction of tissue elasticity (e.g., Young''s modulus) requires regularization and known information of forces and/or displacements on tissue boundaries. In practice, it is challenging to choose an appropriate regularization parameter; and the boundary c...
To what extent is the bipolar rheoencephalographic signal contaminated by scalp blood flow? A clinical study to quantify its extra and non-extracranial componen...
Source, September 05, 2014
Background: Impedance plethysmography applied to the head by using a pair of electrodes attached to the scalp surface is known as bipolar Rheoencephalography or REG I and was originally proposed to measure changes in cerebral blood volume related to the heartbeat. REG I was soon discarded in favor o...
Application safety evaluation of the radio frequency identification tag under magnetic resonance imaging
Source, September 04, 2014
Background: Radio Frequency Identification(RFID) has been widely used in healthcare facilities, but it has been paid little attention whether RFID applications are safe enough under healthcare environment. The purpose of this study is to assess the effects of RFID tags on Magnetic Resonance(MR) imag...
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