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Medical & Biological Engineering & Computing

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https://www.readbyqxmd.com/read/28726074/error-performances-of-a-model-based-biplane-fluoroscopic-system-for-tracking-knee-prosthesis-during-treadmill-gait-task
#1
Arnaud Barré, Kamiar Aminian
Roentgen stereophotogrammetry analysis technique allows an accurate measurement of knee joint prosthesis position and orientation using two X-ray images. Although this technique is used generally during static procedure, it is possible to use it with a biplane fluoroscopic system to measure the prosthesis kinematics during functional tasks (e.g., gait, squat, jump) performed in a laboratory environment. However, the performance of the system in terms of errors for the measurements and the model-based matching algorithm are not well known for dynamic tasks such as walking...
July 18, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28714049/vision-based-fluid-type-tactile-sensor-for-measurements-on-biological-tissues
#2
Youngwoo Kim, Goro Obinata, Bongseop Kawk, Jiuk Jung, Suwoong Lee
Hardness, dimensions, and location of biological tissues are important parameters for electronic palpation protocols with standardized performance. This study presents a novel fluid-type tactile sensor able to measure size and depth of heterogeneous substances in elastic bodies. The new sensor is very simple and can be easily fabricated. It consists of an image sensor, LED lights, and a touchpad filled with translucent water. The intensity field of the light traveling in the touchpad is analyzed to estimate the touchpad shape which conforms to the shape of an object in contact...
July 17, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28712014/do-you-see-what-i-see-mobile-eye-tracker-contextual-analysis-and-inter-rater-reliability
#3
S Stuart, D Hunt, J Nell, A Godfrey, J M Hausdorff, L Rochester, L Alcock
Mobile eye-trackers are currently used during real-world tasks (e.g. gait) to monitor visual and cognitive processes, particularly in ageing and Parkinson's disease (PD). However, contextual analysis involving fixation locations during such tasks is rarely performed due to its complexity. This study adapted a validated algorithm and developed a classification method to semi-automate contextual analysis of mobile eye-tracking data. We further assessed inter-rater reliability of the proposed classification method...
July 15, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28712013/a-novel-approach-to-an-automated-needle-insertion-in-brachytherapy-procedures
#4
Ivan M Buzurovic, Slavisa Salinic, Peter F Orio, Paul L Nguyen, Robert A Cormack
One of the most challenging phases in interstitial brachytherapy is the placement of the needles. In these medical procedures, the needles are inserted inside the tissue to guide the positioning of the radioactive sources. The low-dose-rate radioactive sources are placed inside the tissue permanently, whereas a radioactive source in the high-dose-rate brachytherapy is temporarily placed in the desired positions so that the delivery of the prescription dose to the clinical targets can be achieved. Consequently, the precise needle placement directly influences the radiation dose delivery and the treatment outcomes of patients...
July 15, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28712012/development-of-an-mr-compatible-hand-exoskeleton-that-is-capable-of-providing-interactive-robotic-rehabilitation-during-fmri-imaging
#5
Sangjoon J Kim, Yeongjin Kim, Hyosang Lee, Pouya Ghasemlou, Jung Kim
Following advances in robotic rehabilitation, there have been many efforts to investigate the recovery process and effectiveness of robotic rehabilitation procedures through monitoring the activation status of the brain. This work presents the development of a two degree-of-freedom (DoF) magnetic resonance (MR)-compatible hand device that can perform robotic rehabilitation procedures inside an fMRI scanner. The device is capable of providing real-time monitoring of the joint angle, angular velocity, and joint force produced by the metacarpophalangeal (MCP) and proximal interphalangeal (PIP) joints of four fingers...
July 15, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28702812/characterisation-of-human-av-nodal-properties-using-a-network-model
#6
Mikael Wallman, Frida Sandberg
Characterisation of the AV-node is an important step in determining the optimal form of treatment for supraventricular tachycardias. To integrate and analyse patient-specific measurements, mathematical modelling has emerged as a valuable tool. Here we present a model of the human AV-node, consisting of a series of interacting nodes, each with separate dynamics in refractory time and conduction delay. The model is evaluated in several scenarios, including atrial fibrillation (AF) and clinical pacing, using simulated and measured data...
July 13, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28702811/a-machine-learning-framework-involving-eeg-based-functional-connectivity-to-diagnose-major-depressive-disorder-mdd
#7
Wajid Mumtaz, Syed Saad Azhar Ali, Mohd Azhar Mohd Yasin, Aamir Saeed Malik
Major depressive disorder (MDD), a debilitating mental illness, could cause functional disabilities and could become a social problem. An accurate and early diagnosis for depression could become challenging. This paper proposed a machine learning framework involving EEG-derived synchronization likelihood (SL) features as input data for automatic diagnosis of MDD. It was hypothesized that EEG-based SL features could discriminate MDD patients and healthy controls with an acceptable accuracy better than measures such as interhemispheric coherence and mutual information...
July 13, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28699055/recovery-of-heart-rate-variability-after-treadmill-exercise-analyzed-by-lagged-poincar%C3%A3-plot-and-spectral-characteristics
#8
Ping Shi, Sijung Hu, Hongliu Yu
The aim of this study was to analyze the recovery of heart rate variability (HRV) after treadmill exercise and to investigate the autonomic nervous system response after exercise. Frequency domain indices, i.e., LF(ms(2)), HF(ms(2)), LF(n.u.), HF(n.u.) and LF/HF, and lagged Poincaré plot width (SD1 m ) and length (SD2 m ) were introduced for comparison between the baseline period (Pre-E) before treadmill running and two periods after treadmill running (Post-E1 and Post-E2). The correlations between lagged Poincaré plot indices and frequency domain indices were applied to reveal the long-range correlation between linear and nonlinear indices during the recovery of HRV...
July 11, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28691131/a-survey-of-context-recognition-in-surgery
#9
Igor Pernek, Alois Ferscha
With the introduction of operating rooms of the future context awareness has gained importance in the surgical environment. This paper organizes and reviews different approaches for recognition of context in surgery. Major electronic research databases were queried to obtain relevant publications submitted between the years 2010 and 2015. Three different types of context were identified: (i) the surgical workflow context, (ii) surgeon's cognitive and (iii) technical state context. A total of 52 relevant studies were identified and grouped based on the type of context detected and sensors used...
July 10, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28691130/young-and-advanced-tumor-some-2d-electrodynamic-distinctions-melanoma-and-satellite-during-a-vascular-occlusion-test-feasibility-study
#10
Y Babich, M Nuzhdina, S Syniuta
Conventional methods of electrobioimpedance imaging are not suited for adequate visualization of the skin electrical impedance landscape (SEL) because they do not provide high spatial resolution at large enough area of view. The skin electrodynamics introscopy (SEI) enabled dynamic spectral imaging of the SEL at 32 × 64 mm(2) area with 1 mm spatial resolution. The focus of the study was to investigate the SEL distinguishing features between early and advanced-stage cancer at the model object of melanoma and its satellite...
July 10, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28687962/the-impact-of-goal-oriented-task-design-on-neurofeedback-learning-for-brain-computer-interface-control
#11
S R McWhinney, A Tremblay, S G Boe, T Bardouille
Neurofeedback training teaches individuals to modulate brain activity by providing real-time feedback and can be used for brain-computer interface control. The present study aimed to optimize training by maximizing engagement through goal-oriented task design. Participants were shown either a visual display or a robot, where each was manipulated using motor imagery (MI)-related electroencephalography signals. Those with the robot were instructed to quickly navigate grid spaces, as the potential for goal-oriented design to strengthen learning was central to our investigation...
July 8, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28676955/a-novel-approach-for-acoustic-estimation-of-neck-fluid-volume-between-men-and-women
#12
Mehrnaz Shokrollahi, Frank Rudzicz, Daniel Vena, T Douglas Bradley, Azadeh Yadollahi
Obstructive Sleep apnea can be caused by fluid shift from the legs to the neck that narrows the upper airway (UA) and contributes to changes in tracheal sound. Tracheal sound is generated from the turbulent airflow in the pharynx and respiratory airways and it has recently been used to estimate increases in neck fluid volume (NFV). However, tracheal sound is also highly variable among people, especially across the sexes. In this paper, a novel method is proposed to select tracheal sound features towards estimating NFV in men and women separately...
July 5, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28674781/spike-densities-of-the-amygdala-and-neocortex-reflect-progression-of-kindled-motor-seizures
#13
Yu-Lin Wang, Sheng-Fu Liang, Alvin W Y Su, Fu-Zen Shaw
Amygdala kindling is a common temporal lobe-like seizure model. In the present study, temporal and spectral analyses of the ictal period were investigated throughout amygdala kindling in response to different behavioral seizures. Right-side amygdala was kindled to induce epileptiform afterdischarges (ADs). ADs of both the frontal cortex and amygdala were analyzed. Powers of the low (0-9 Hz)- and high (12-30 Hz)-frequency bands in response to different behavioral seizures were calculated. Densities of upward and downward peaks of spikes, which reflected information of spike count and spike pattern, throughout kindle-induced ADs were calculated...
July 4, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28674780/delivery-devices-for-exposure-of-biological-cells-to-nanosecond-pulsed-electric-fields
#14
Malak Soueid, Martinus C F Dobbelaar, Sabrina Bentouati, Sylvia M Bardet, Rodney P O'Connor, Delphine Bessières, Jean Paillol, Philippe Leveque, Delia Arnaud-Cormos
In this paper, delivery devices for nanosecond pulsed electric field exposure of biological samples in direct contact with electrodes or isolated are presented and characterized. They are based on a modified electroporation cuvette and two transverse electromagnetic cells (TEM cells). The devices were used to apply pulses with high intensity (4.5 kV) and short durations (3 and 13 ns). The delivery devices were electromagnetically characterized in the frequency and time domains. Field intensities of around 5, 0...
July 4, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28674779/analysis-of-three-dimensional-endocardial-and-epicardial-strains-from-cardiac-magnetic-resonance-in-healthy-subjects-and-patients-with-hypertrophic-cardiomyopathy
#15
Xiaodan Zhao, Ru San Tan, Hak Chiaw Tang, Shuang Leng, Jun-Mei Zhang, Liang Zhong
Hypertrophic cardiomyopathy (HCM) is a genetic disease that leads to left ventricle (LV) hypertrophy with or without the presence of LV outflow tract obstruction. The aim of this study was to find an easy and useful indicator based on cardiac magnetic resonance (CMR) images for control subjects and patients with and without obstruction. CMR scans were performed for 19 control subjects and 19 HCM patients. Endocardial strain was defined as [Formula: see text], with [Formula: see text] being the length of endocardium at end-diastole (end-systole); similarly for epicardial strain ([Formula: see text])...
July 3, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28674778/the-temporal-behavior-and-consistency-of-bipolar-atrial-electrograms-in-human-persistent-atrial-fibrillation
#16
Tiago P Almeida, Gavin S Chu, Michael J Bell, Xin Li, João L Salinet, Nawshin Dastagir, Jiun H Tuan, Peter J Stafford, G André Ng, Fernando S Schlindwein
The unstable temporal behavior of atrial electrical activity during persistent atrial fibrillation (persAF) might influence ablation target identification, which could explain the conflicting persAF ablation outcomes in previous studies. We sought to investigate the temporal behavior and consistency of atrial electrogram (AEG) fractionation using different segment lengths. Seven hundred ninety-seven bipolar AEGs were collected with three segment lengths (2.5, 5,and 8 s) from 18 patients undergoing persAF ablation...
July 3, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28670659/ultrasonic-motor-induced-geometric-distortions-in-magnetic-resonance-images
#17
P Shokrollahi, J M Drake, A A Goldenberg
Ultrasonic motors (USMs) are common actuators that can be safely used in the magnetic resonance imaging (MRI) environment. However, lack of MRI compatibility results in issues such as image distortion. This fact led researchers to shift focus from USMs to pneumatic and hydraulic actuators in development of surgical robots. The aim is to quantify and compensate the geometric distortion of MR images as generated by the presence of USMs. An ultrasonic motor was positioned in three orientations with respect to the bore axis...
July 3, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28667591/classification-of-upper-limb-disability-levels-of-children-with-spastic-unilateral-cerebral-palsy-using-k-means-algorithm
#18
Sana Raouafi, Sofiane Achiche, Mickael Begon, Aurélie Sarcher, Maxime Raison
Treatment for cerebral palsy depends upon the severity of the child's condition and requires knowledge about upper limb disability. The aim of this study was to develop a systematic quantitative classification method of the upper limb disability levels for children with spastic unilateral cerebral palsy based on upper limb movements and muscle activation. Thirteen children with spastic unilateral cerebral palsy and six typically developing children participated in this study. Patients were matched on age and manual ability classification system levels I to III...
July 1, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28667590/using-nonlinear-finite-element-models-to-analyse-stress-distribution-during-subluxation-and-torque-required-for-dislocation-of-newly-developed-total-hip-structure-after-prosthetic-impingement
#19
Wei-Min Chi, Chien-Chung Lin, Ying-Jui Ho, Hsiao-Che Lin, Jian-Horng Chen
Dislocation is a serious potential complication of total hip replacement. Previous studies have proposed a newly developed total hip structure that meets the required oscillation angle of 120°, for which the chamfer on the acetabular liner rim was designed to enable the neck to impinge on the chamfer over a large area after impingement occurs. This study adopted the finite element method to further analyse the torque limits leading to dislocation and the contact stresses at the impingement and egress sites of the liner during subluxation...
July 1, 2017: Medical & Biological Engineering & Computing
https://www.readbyqxmd.com/read/28667589/design-and-evaluation-of-safety-operation-vr-training-system-for-robotic-catheter-surgery
#20
Yu Wang, Shuxiang Guo, Yaxin Li, Takashi Tamiya, Yu Song
A number of remote robotic catheter systems have been developed to protect physicians from X-ray exposure in endovascular surgery. However, the teleoperation prevents the physicians sensing the force directly which may easily result in healthy vessels injured. To realize the safe operation, a tissue protection-based VR training system has been developed in this paper to prevent collateral damage by collision. The integrated VR simulator cannot only remind the novice possible collisions by visual signs, but also cooperate with the newly designed tissue protection mechanism to remit collision trauma beforehand...
June 30, 2017: Medical & Biological Engineering & Computing
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