Results 201 to 210 of about 66,879 (258)

Adjustable shunts and proton therapy: a magnetic combination

Child's Nervous System, 2023
Due to evidence for proton beam therapy (PBT) in pediatric central nervous system (CNS) tumors, compact proton therapy systems became commercially available to allow better integration in a hospital setting. However, these systems have a non-zero magnetic field at the level of the patient.
Sofie, Dietvorst, Kenneth, Poels, Karen, Van Beek, Ronald, Peeters, Philippe, De Vloo   +4 more
openaire   +2 more sources

Magnet Current Bypass Shunt

IEEE Transactions on Nuclear Science, 1985
A precision active shunt has been developed for fine tuning of individual magnet fields in a series magnet string operated from a single power supply. The shunt uses power transistors operated in linear mode to regulate the bypass current in the range 0 to 50 A with precision of ±10 mA. Communication with and control of shunt which may be floating 1000
F. Cilyo, J. McCarthy, B. Wisner
openaire   +1 more source

Magnetic field interactions in adjustable hydrocephalus shunts

Journal of Neurosurgery: Pediatrics, 2008
Object Exposing patients with ventricular shunts to magnetic fields and MR imaging procedures poses a significant risk of unintentional changes in shunt settings. Shunt valves can also generate considerable imaging artifacts. The purpose of this study was to determine the magnetic field safety and MR imaging compatibility of 5 adjustable models of ...
Andrea Lavinio, Sally Harding, Floor Van Der Boogaard, Marek Czosnyka, Peter Smielewski, Hugh K. Richards, John D. Pickard, Zofia H. Czosnyka   +7 more
openaire   +2 more sources

Self-magnetic drive of a shunting arc

Surface and Coatings Technology, 2004
A magnetically driven shunting arc as a pulsed metal/solid plasma source has been newly developed. This article describes fundamental electrical and plasma dynamic characteristics of the magnetically driven arc. The shunting arc plasma has a feature of self-ignition without using any triggering mechanism method at a wide gas pressure range from vacuum ...
K Takaki, R Hasegawa, S Nakamura, S Mukaigawa, T Fujiwara, M Kumagai, K Yukimura   +6 more
openaire   +2 more sources

Magnetic Shunt for Three Phase Reactors

IEEE Transactions on Power Apparatus and Systems, 1973
For three phase shunt reactors to function effectively in EHV power systems the behavior of the circuit reluctance must be known under all operating conditions. Difficulties have occurred in effectively designing electromagnetic circuits with multiple air gaps in shunt reactors.
Alexander Emanuel, Jitendra Vora
openaire   +1 more source

Diode-shunting in magnetic amplifiers

Transactions of the American Institute of Electrical Engineers, Part I: Communication and Electronics, 1956
IN THE self-saturating type of magnetic amplifier it is desirable to bias the saturable reactor to a particular point on its hysteresis loop. Higher gain and better linearity of the transfer function can be achieved in this manner. Shunt paths around the diodes of the magnetic amplifier afford a convenient means of biasing the saturable reactors.
J. L. Lowrance, J. D. Dolan
openaire   +1 more source

Magnetically programmable shunt valve: MRI at 3-Tesla

Magnetic Resonance Imaging, 2007
A magnetically programmable cerebrospinal fluid (CSF) shunt valve (Codman Hakim Programmable Valve, Codman, a Johnson & Johnson Company, Raynham, MA) was assessed for magnetic field interactions, heating, artifacts and functional changes at 3-Tesla. The programmable valve showed minor magnetic field interactions and heating (+0.4 degrees C).
Frank G, Shellock, Stephen F, Wilson, Christophe P, Mauge   +2 more
openaire   +2 more sources

Magnetic Resonance Imaging and Cerebrospinal Fluid Shunt Valves

New England Journal of Medicine, 2005
To the Editor: In about 80 percent of all cases of hydrocephalus, the accumulation of cerebrospinal fluid is treated with shunt valves.1 Over the past 30 years, magnetically adjustable valves have become widely accepted and routinely implanted devices. In central and northern Europe, adjustable valves are routinely implanted for about 40 percent of all
Michael, Akbar, Christoph, Stippich, Alfred, Aschoff   +2 more
openaire   +2 more sources

Magnetic Resonance Imaging of Arterioportal Shunts in the Liver

Topics in Magnetic Resonance Imaging, 2002
Localized perfusional variations are being seen more frequently in magnetic resonance imaging (MRI) as the increased reliance of the optimized arterial-phase contrast-enhanced strategies has become more commonplace. Many of these findings are related to the various organic or functional arterioportal shunts in the liver.
Jeong-Sik, Yu, Neil M, Rofsky
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Shunt protection for superconducting Maglev Magnets

Cryogenics, 1979
Abstract Closely coupled, short-circuited shunt coils are proposed for quench protection of super-conducting Maglev magnets which use high resistance, matrix composite conductors. It is shown that, by suitable design, the shunts can reduce ac losses and that the changing currents during magnet energization or vehicle lift off and landing can be ...
openaire   +1 more source