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Pulsed electromagnetic field

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https://www.readbyqxmd.com/read/29350408/calibration-and-non-orthogonality-correction-of-three-axis-hall-sensors-for-the-monitoring-of-mri-workers-exposure-to-static-magnetic-fields
#1
Antoine Delmas, Lamia Belguerras, Nicolas Weber, Freddy Odille, Cédric Pasquier, Jacques Felblinger, Pierre-André Vuissoz
A Magnetic Resonance Imaging (MRI) scanner uses three different electromagnetic fields (EMF) to produce body images: a static permanent magnetic field (MF), several pulsed magnetic gradients, and a radiofrequency pulse. As a result, any occupation that includes an MRI exposes workers to a strong MF. The World Health Organization has now given the monitoring of occupational EMF exposure a high priority. One design for a low-cost, compact MF exposure monitor (« MR exposimeter ») uses a set of three orthogonally assembled Hall sensors...
January 19, 2018: Bioelectromagnetics
https://www.readbyqxmd.com/read/29341731/ultrafocused-electromagnetic-field-pulses-with-a-hollow-cylindrical-waveguide
#2
P Maurer, J Prat-Camps, J I Cirac, T W Hänsch, O Romero-Isart
We theoretically show that a dipole externally driven by a pulse with a lower-bounded temporal width, and placed inside a cylindrical hollow waveguide, can generate a train of arbitrarily short and focused electromagnetic pulses. The waveguide encloses vacuum with perfect electric conducting walls. A dipole driven by a single short pulse, which is properly engineered to exploit the linear spectral filtering of the cylindrical hollow waveguide, excites longitudinal waveguide modes that are coherently refocused at some particular instances of time, thereby producing arbitrarily short and focused electromagnetic pulses...
July 28, 2017: Physical Review Letters
https://www.readbyqxmd.com/read/29324868/effects-of-pulsed-electromagnetic-field-pemf-on-the-tensile-biomechanical-properties-of-diabetic-wounds-at-different-phases-of-healing
#3
Harry M C Choi, Alex K K Cheing, Gabriel Y F Ng, Gladys L Y Cheing
The present study investigated the effects of pulsed electromagnetic field (PEMF) on the tensile biomechanical properties of diabetic wounds at different phases of healing. Two intensities of PEMF were adopted for comparison. We randomly assigned 111 10-week-old male streptozotocin-induced diabetic Sprague-Dawley rats to two PEMF groups and a sham control group. Six-millimetre biopsy punched full thickness wounds were made on the lateral side of their hindlimbs. The PEMF groups received active PEMF delivered at 25 Hz with intensity of either 2 mT or 10 mT daily, while the sham group was handled in a similar way except they were not exposed to PEMF...
2018: PloS One
https://www.readbyqxmd.com/read/29310504/the-effect-of-electromagnetic-fields-on-postoperative-pain-and-locomotor-recovery-in-dogs-with-acute-severe-thoracolumbar-intervertebral-disc-extrusion-a-randomized-placebo-controlled-prospective-clinical-trial
#4
Natalia Zidan, Joe Fenn, Emily Griffith, Peter J Early, Chris L Mariani, Karen R Munana, Julien Guevar, Natasha Olby
Spinal cord injury (SCI) due to acute intervertebral disc extrusions (IVDE) is common in dogs and is treated by surgical decompression. Dogs with sensorimotor complete injuries have an incomplete recovery. Pulsed electromagnetic fields (PEMF) reduce postoperative pain through anti-inflammatory effects and there is growing evidence for neuroprotective effects. This randomized, controlled clinical trial evaluated the effect of PEMF on post-operative pain and neurologic recovery in dogs with surgically treated sensorimotor complete SCI due to acute IVDE...
January 8, 2018: Journal of Neurotrauma
https://www.readbyqxmd.com/read/29251361/pulsed-electromagnetic-field-improves-subchondral-bone-microstructure-in-knee-osteoarthritis-rats-through-a-wnt-%C3%AE-catenin-signaling-associated-mechanism
#5
Xiaotian Yang, Hongchen He, Qiang Gao, Chengqi He
Pulsed electromagnetic field (PEMF) is often used for management of osteoarthritis (OA). The aim of the study was to determine whether PEMF can successfully improve subchondral bone microstructure through a Wnt/β-catenin signaling-associated pathway in rats with knee OA induced by low-dose monosodium iodoacetate (MIA). Seventy-two 12-week-old male Sprague-Dawley rats were randomly assigned to three groups: OA (n = 24), PEMF (n = 24), and Control (n = 24). OA was induced (OA and PEMF groups) by injecting 0...
December 18, 2017: Bioelectromagnetics
https://www.readbyqxmd.com/read/29229438/pulsed-electromagnetic-fields-pemf-attenuate-changes-in-vertebral-bone-mass-architecture-and-strength-in-ovariectomized-mice
#6
Tao Lei, Zhuowen Liang, Feijiang Li, Chi Tang, Kangning Xie, Pan Wang, Xu Dong, Shuai Shan, Maogang Jiang, Qiaoling Xu, Erping Luo, Guanghao Shen
Pulsed electromagnetic fields (PEMF) has been investigated as a noninvasive alternative method to prevent bone loss for postmenopausal osteoporosis (OP), and the bone tissue involved in these studies are usually long bones such as femur and tibia in OP patients or rat models. However, few studies have investigated the effects of PEMF on the vertebral bone in mice with OP. This study aimed to investigate whether PEMF preserve lumbar vertebral bone mass, microarchitecture and strength in ovariectomized (OVX) mouse model of OP and its associated mechanisms...
December 8, 2017: Bone
https://www.readbyqxmd.com/read/29216049/field-only-integral-equation-method-for-time-domain-scattering-of-electromagnetic-pulses
#7
Evert Klaseboer, Qiang Sun, Derek Y C Chan
The scattering of electromagnetic pulses is described using a non-singular boundary integral method to solve directly for the field components in the frequency domain, and Fourier transform is then used to obtain the complete space-time behavior. This approach is stable for wavelengths both small and large relative to characteristic length scales. Amplitudes and phases of field values can be obtained accurately on or near material boundaries. Local field enhancement effects due to multiple scattering of interest to applications in microphotonics are demonstrated...
December 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29212756/the-interaction-between-electromagnetic-fields-at-megahertz-gigahertz-and-terahertz-frequencies-with-cells-tissues-and-organisms-risks-and-potential
#8
Sergii Romanenko, Ryan Begley, Alan R Harvey, Livia Hool, Vincent P Wallace
Since regular radio broadcasts started in the 1920s, the exposure to human-made electromagnetic fields has steadily increased. These days we are not only exposed to radio waves but also other frequencies from a variety of sources, mainly from communication and security devices. Considering that nearly all biological systems interact with electromagnetic fields, understanding the affects is essential for safety and technological progress. This paper systematically reviews the role and effects of static and pulsed radio frequencies (100-109 Hz), millimetre waves (MMWs) or gigahertz (109-1011 Hz), and terahertz (1011-1013 Hz) on various biomolecules, cells and tissues...
December 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/29205174/numerical-implementation-of-magneto-acousto-electric-tomography-maet-using-a-linear-phased-array-transducer
#9
Mehmet Soner Gözü, Reyhan Zengin, Nevzat Guneri Gencer
In this study, the performance and implementation of magneto-acousto-electric tomography (MAET) is investigated using a linear phased array (LPA) transducer. The goal of MAET is to image the conductivity distribution in biological bodies. It uses the interaction between ultrasound and a static magnetic field to generate velocity current density distribution inside the body. The resultant voltage due to velocity current density is sensed by surface electrodes attached on the body. In this study, the theory of MAET is reviewed...
December 5, 2017: Physics in Medicine and Biology
https://www.readbyqxmd.com/read/29195401/high-speed-displacement-measurement-based-on-electro-magnetic-induction-applied-to-electromagnetically-driven-ring-expansion
#10
Xiaotao Han, Jiawei Wu, Lantao Huang, Lei Qiu, Qi Chen, Quanliang Cao, Fritz Herlach, Liang Li
Investigating the mechanism of electromagnetic forming (EMF) becomes a hot topic in the field of metal forming. The high speed up to 200 m/s in EMF makes it a real challenge to capture the forming process. To this end, a new method for measuring displacement at high speed based on electromagnetic induction has been developed. Specifically this is used to measure the displacement of an expanding metal ring driven by a pulsed magnetic field; this is one of the basic EMF processes. The new method is simple and practical, and it combines high-speed response with adequate precision...
November 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29194732/doppler-ultrasound-triggering-for-cardiac-mri-at-7t
#11
F Kording, C Ruprecht, B Schoennagel, K Fehrs, J Yamamura, G Adam, J Goebel, K Nassenstein, S Maderwald, H H Quick, O Kraff
PURPOSE: A prerequisite for cardiac MR (CMR) imaging is adequate synchronization of image acquisition with the cardiac cycle. Electrocardiogram triggering may be hampered by electromagnetic interferences at high field strength. The purpose of this work is to evaluate the feasibility of Doppler ultrasound triggering for CMR image synchronization at 7T ultra-high-field MRI. METHODS: A custom-built Doppler ultrasound (DUS) trigger device was developed. Magnetic resonance compatibility was evaluated using E- and H-field probes and flip angle maps prior to the study...
December 1, 2017: Magnetic Resonance in Medicine: Official Journal of the Society of Magnetic Resonance in Medicine
https://www.readbyqxmd.com/read/29184281/high-intensity-laser-therapy-versus-pulsed-electromagnetic-field-in-the-treatment-of-primary-dysmenorrhea
#12
Ali Abd El-Monsif Thabet, Ahmed Mohamed Elsodany, Kadrya H Battecha, Mansour Abdullah Alshehri, Bassem Refaat
[Purpose] To determine the efficacy of high intensity laser therapy (HILT) versus pulsed electromagnetic field (PEMF) in the treatment of primary dysmenorrhea. [Subjects and Methods] This was a randomized clinical trial that included 52 girls diagnosed with primary dysmenorrhea and who were assigned randomly into two groups of equal numbers. The treatment was three sessions every cycle for three consecutive cycles where group (A) included those participants treated with HILT 15 min/session and group (B) those who were treated with PEMF 30 min/session...
October 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/29184107/in-situ-high-resolution-visualization-of-laser-induced-periodic-nanostructures-driven-by-optical-feedback
#13
Alberto Aguilar, Cyril Mauclair, Nicolas Faure, Jean-Philippe Colombier, Razvan Stoian
Optical feedback is often evoked in laser-induced periodic nanostructures. Visualizing the coupling between surfaces and light requires highly-resolved imaging methods. We propose in-situ structured-illumination-microscopy to observe ultrafast-laser-induced nanostructures during fabrication on metallic glass surfaces. This resolves the pulse-to-pulse development of periodic structures on a single irradiation site and indicates the optical feedback on surface topographies. Firstly, the quasi-constancy of the ripples pattern and the reinforcement of the surface relief with the same spatial positioning indicates a phase-locking mechanism that stabilizes and amplifies the ordered corrugation...
November 28, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29180176/magnetic-transcutaneous-fixation-an-experimental-study-in-pigs
#14
Michel L H T Vaena, João P Sinnecker, Thiago J S Vargas, Fernando Serra-Guimarães, Ruy G Marques
BACKGROUND: Magnetic subdermal implants have never been studied in the context of magnetic fixation of an external device to the body's surface. Excessive attractive force between the implant and the external device may compromise local circulation due to mechanical compression, leading to necrosis. OBJECTIVE: To evaluate the feasibility of transcutaneous magnetic fixation and assess secondary skin changes when subjected to a continuous static magnetic field. METHODS: Using the pig as an animal model, 72 implants were introduced in 12 animals...
December 2017: Journal of Surgical Research
https://www.readbyqxmd.com/read/29174271/effects-of-pulsed-electromagnetic-field-therapy-at-different-frequencies-and-durations-on-rotator-cuff-tendon-to-bone-healing-in-a-rat-model
#15
Julianne Huegel, Daniel S Choi, Courtney A Nuss, Mary C C Minnig, Jennica J Tucker, Andrew F Kuntz, Erik I Waldorff, Nianli Zhang, James T Ryaby, Louis J Soslowsky
BACKGROUND: Rotator cuff tears affect millions of individuals each year, often requiring surgical intervention. However, repair failure remains common. We have previously shown that pulsed electromagnetic field (PEMF) therapy improved tendon-to-bone healing in a rat rotator cuff model. The purpose of this study was to determine the influence of both PEMF frequency and exposure time on rotator cuff healing. METHODS: Two hundred ten Sprague-Dawley rats underwent acute bilateral supraspinatus injury and repair followed by either Physio-Stim PEMF or high-frequency PEMF therapy for 1, 3, or 6 hours daily...
November 22, 2017: Journal of Shoulder and Elbow Surgery
https://www.readbyqxmd.com/read/29165241/lifting-the-veil-on-the-dynamics-of-neuronal-activities-evoked-by-transcranial-magnetic-stimulation
#16
Bingshuo Li, Juha P Virtanen, Axel Oeltermann, Cornelius Schwarz, Martin A Giese, Ulf Ziemann, Alia Benali
Transcranial magnetic stimulation (TMS) is a widely used non-invasive tool to study and modulate human brain functions. However, TMS-evoked activity of individual neurons has remained largely inaccessible due to the large TMS-induced electromagnetic fields. Here we present a general method providing direct in vivo electrophysiological access to TMS-evoked neuronal activity 0.8-1 ms after TMS onset. We translated human single-pulse TMS to rodents and unveiled time-grained evoked activities of motor cortex layer V neurons that show high-frequency spiking within the first 6 ms depending on TMS-induced current orientation and a multiphasic spike-rhythm alternating between excitation and inhibition in the 6-300 ms epoch, all of which can be linked to various human TMS responses recorded at the level of spinal cord and muscles...
November 22, 2017: ELife
https://www.readbyqxmd.com/read/29151080/changes-in-u937-cell-viability-induced-by-stress-factors-possible-role-of-calmodulin
#17
K K Wojcik-Piotrowicz, J Kaszuba-Zwoinska, E Rokita, B Nowak, P Thor
Current studies were aimed to elucidate influence of magnetic field (MF) stimulation on cell viability and its effect on expression of calmodulin (CaM) and Hsp70 protein which plays a role of cell stress indicator and is a Ca(2+)-dependent CaM-binding protein. For the experimental model we have chosen U937 cell line exposed to chemical- and/or physical stress factors. Puromycin (PMC) was used as a chemical apoptosis inducer. Alternating (AC) (6.5rms mT, 35 Hz) magnetic field combined with 6 mT static (DC) component, or pulsed electromagnetic field (45 ± 5)mT, 50 Hz (PEMF) acted as physical stressors...
August 2017: Journal of Physiology and Pharmacology: An Official Journal of the Polish Physiological Society
https://www.readbyqxmd.com/read/29109418/extremely-low-frequency-pulsed-electromagnetic-fields-cause-antioxidative-defense-mechanisms-in-human-osteoblasts-via-induction-of-%C3%A2-o2-and-h2o2
#18
Sabrina Ehnert, Anne-Kristin Fentz, Anna Schreiner, Johannes Birk, Benjamin Wilbrand, Patrick Ziegler, Marie K Reumann, Hongbo Wang, Karsten Falldorf, Andreas K Nussler
Recently, we identified a specific extremely low-frequency pulsed electromagnetic field (ELF-PEMF) that supports human osteoblast (hOBs) function in an ERK1/2-dependent manner, suggesting reactive oxygen species (ROS) being key regulators in this process. Thus, this study aimed at investigating how ELF-PEMF exposure can modulate hOBs function via ROS. Our results show that single exposure to ELF-PEMF induced ROS production in hOBs, without reducing intracellular glutathione. Repetitive exposure (>3) to ELF-PEMF however reduced ROS-levels, suggesting alterations in the cells antioxidative stress response...
November 6, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29103436/effectiveness-of-pulsed-electromagnetic-field-for-pain-caused-by-placement-of-initial-orthodontic-wire-in-female-orthodontic-patients-a-preliminary-single-blind-randomized-clinical-trial
#19
RANDOMIZED CONTROLLED TRIAL
Jin-Gon Jung, Jae Hyun Park, Sang-Cheol Kim, Kyung-Hwa Kang, Jin-Hyoung Cho, Jin-Woo Cho, Na-Young Chang, R Curtis Bay, Jong-Moon Chae
INTRODUCTION: The purpose of this 2-arm parallel trial was to assess the effects of pulsed electromagnetic field (PEMF) on the reduction of pain caused by initial orthodontic tooth movement. METHODS: Thirty-three female patients (mean age, 16.8 ± 3.8 years) who began orthodontic treatment using fixed appliances were examined. In the pilot study, male patients were less likely to use the PEMF device (epatchQ; Speed Dental, Seoul, Korea) and answer a survey consistently, so eligibility criteria were female patients who were periodontally and systemically healthy at the initiation of treatment and had no history of dental pain in the prior 2 weeks or who used no medications (anti-inflammatory or analgesic drugs) during the experiment period...
November 2017: American Journal of Orthodontics and Dentofacial Orthopedics
https://www.readbyqxmd.com/read/29075322/pulse-electromagnetic-fields-enhance-extracellular-electron-transfer-in-magnetic-bioelectrochemical-systems
#20
Huihui Zhou, Bingfeng Liu, Qisong Wang, Jianmin Sun, Guojun Xie, Nanqi Ren, Zhiyong Jason Ren, Defeng Xing
BACKGROUND: Microbial extracellular electron transfer (EET) is essential in driving the microbial interspecies interaction and redox reactions in bioelectrochemical systems (BESs). Magnetite (Fe3O4) and magnetic fields (MFs) were recently reported to promote microbial EET, but the mechanisms of MFs stimulation of EET and current generation in BESs are not known. This study investigates the behavior of current generation and EET in a state-of-the-art pulse electromagnetic field (PEMF)-assisted magnetic BES (PEMF-MBES), which was equipped with magnetic carbon particle (Fe3O4@N-mC)-coated electrodes...
2017: Biotechnology for Biofuels
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