magnetic field

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Related to magnetic field strength: magnetic flux density


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 ?
Those who had not yet completed algebra did not recognize the types of variation, but were able to numerically predict magnetic field strength for different solenoids, even for those that they did not have (e.g., a solenoid wrapped with 200 coils would have a magnetic field strength of 144 Gauss).
The amplitude of the magnetic field strength on the surface of the back of the stator core is related to the magnetic flux density value by a nonlinear dependence and in the range of inductions 0.6 to 1.7 T is approximated with sufficient accuracy by a polynomial of the 6th degree:
An increase in the magnetic field strength gives an increase in the pull-in voltage for the system.
Numerical model can be used to analyse various parameters like magnetic field strength, layered and single AMRs.
The intensity of the interference dip (A) changes from -19.77 dB to -34.70 dB as shown in Figure 8(a) and the intensity of the interference peak (C) changes from -4.79 dB to -7.75 dB as shown in Figure 8(b) with the increase of the magnetic field strength. As in the principle simulation section, on one hand the center wavelength of dip (A) and peak (C) hardly shifts with the change of the magnetic field; on the other hand the intensities of peak (C) decrease and the intensities of dip (A) increase with an increase of the magnetic field because of the tunable RI and absorption coefficient of MF.
According to the results presented in Table 2, the values of magnetic field strength He and magnetic induction Br are growing with the increasing of size of [Fe.sub.3][O.sub.4] crystallites.
The resistivity dependence on magnetic field strength was measured for the MR fluid MRF-140CG.
With a variety of options available in terms of magnetic field strength, additional features, and cost, purchasing hospitals have several choices in terms of which system they inevitably decide to buy, and market offerings are only growing.
The point value of the local magnetic field strength [??] at the location of a particle can be used since the distance between the poles of the particle is much smaller than the distance between the poles of the external source.
Magnetic field strength is increasing around the broken bar in rotor and also in stator facing the broken bar.
The appeal will also contribute towards the replacement of a second MRI scanner, with a higher magnetic field strength and a wider tunnel - particularly for patients who are obese or suffer from claustrophobia.