magnetic field

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Related to magnetic flux density: magnetic field strength, magnetic field intensity


1. an area or open space, as an operative field or visual field.
2. a range of specialization in knowledge, study, or occupation.
3. in embryology, the developing region within a range of modifying factors.
auditory field the space or range within which stimuli will be perceived as sound.
disturbed energy field a nursing diagnosis defined as a disruption of the flow of energy surrounding a person's being that results in disharmony of the body, mind, and/or spirit.
energy field the flow of energy surrounding a person.
extended field in radiation therapy, such as for malignant lymphoma, an area of irradiation beyond the involved field. See also under irradiation.
high-power field the area of a slide visible under the high magnification system of a microscope.
individuation field a region in which an organizer influences adjacent tissue to become a part of a total embryo.
inverted Y field in radiation therapy, such as for malignant lymphoma, a circumscribed area of irradiation below the diaphragm, covering the spleen, extending down the midline, and branching inferiorly to form tails across the inguinal areas.
involved field in radiation therapy, such as for malignant lymphoma, the irradiated area when irradiation has been limited to sites of detectable macroscopic disease. See also under irradiation.
low-power field the area of a slide visible under the low magnification system of a microscope.
magnetic field that portion of space about a magnet in which its action is perceptible.
mantle field in radiation therapy, such as for malignant lymphoma, a circumscribed area of irradiation around the shoulders and chest, including the neck, clavicular regions, axillae, and mediastinum. See also under irradiation.
morphogenetic field an embryonic region out of which definite structures normally develop.
operating field (operative field) an isolated area where surgery is performed; it must be kept sterile by aseptic techniques (see surgical asepsis). Called also surgical field.
sterile field an operative field that is properly sterile according to surgical asepsis. It includes having all furniture and equipment covered with sterile drapes and all personnel being properly attired.
surgical field operative field.
visual field (F) (vf) the area within which stimuli will produce the sensation of sight with the eye in a straight-ahead position.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

mag·net·ic field

the sphere of influence of a magnet.
Farlex Partner Medical Dictionary © Farlex 2012

magnetic field

An MRI term for the magnetic lines of force (flux) which extend from a north polarity and enter a south polarity of a magnet to form a closed loop around the outside of a magnetic material.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.

Magnetic field

The three-dimensional area surrounding a magnet, in which its force is active. During MRI, the patient's body is permeated by the force field of a superconducting magnet.
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
Magnetic flux density created by the surface current flowing over the toroidal current surface has only an azimuthal component and is concentrated inside the toroidal volume, in other words, there is no field of scattering in the idealized model.
The velocity of the annular flow weight function vector W is dependent on the magnetic flux density vector [??] and virtual current vector [??].
It can be seen from Figure 8 that, in three experimental procedures, the magnetic flux density B both in X direction and in Y direction linearly decreases with increasing stress, and the inflection points of the stress-B curves emerge and the variation character of magnetic memory signals suddenly changes when the pipeline yields.
The damping coefficient in Figure 7(b) showed a slight fluctuation when magnetic flux density increased, especially when the 30 Hz excitation frequency was given, but the value in overall increased gradually with the increase in magnetic flux density until it reached saturation.
8, the MR effects increased with increasing magnetic flux density and magnetic saturation was reached at about 560 mT.
(b) Magnetic flux density along the observation line [L.sub.1] at steady state.
The magnetic flux density distribution in Helmholtz coils along radius (x axis) for different deviation from the center of the coils (z/r)--Theoretical and measured results
Magnetic core is steel 175.4mm in length and 40.5mm in width with high saturation magnetic flux density (over 2.2 Tl), NdFeB permanent magnets with remanent flux density 1.32 Tl, tube is steel 1020 wall thickness 9mm, cooper coil with 5 mm in length and 2 mm in width with a lift-off distance 3mm to the tube.
The stator resistance becomes higher, increasing Joule losses, but it is compensated by the reduction of iron losses due to the magnetic flux density reduction.
Specifically, based on the proposed model (equation 4) it is expected that the amplitude of the stimulating current is reduced in proportion to the magnitude of the applied magnetic flux density.
To PMSM, the electromagnetic force waves, caused by the interaction between rotor and stator harmonic magnetic flux density (the fourth item) and the interaction of various harmonic magnetic flux density produced by permanent magnet (the fifth item), are the major sources of electromagnetic noise.
The air gap magnetic flux density can be expressed as