magnetic field

(redirected from B-field)
Also found in: Dictionary, Thesaurus, Encyclopedia.


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 ?
Moreover, for each of the considered tissues of CNS, for the whole CNS and for PNS, an analysis of the B-field orientation that induced [E.sup.99th] values higher to 90% of their maximum value was performed.
A global sensitivity analysis to assess how the variability of each single input parameter (i.e., the two spherical coordinates of the B-field) influenced the output (i.e., [E.sup.99th]) was carried out.
Finally, [Y.sub.PC_mean] was used to estimate the [E.sup.99th] values relative to 10000 possible orientations of the B-field.
The variability of the exposure in terms of [E.sup.99th] in the CNS due to the change in the orientation of the B-field was low for all the children models, resulting in QCD values lower than 5%.
However, since the sphere is entering a region of B-field gradient as it exits the ramp, the projectile will speed up slightly, and this partially makes up for the rotational energy not accounted for.
Since the wave packets can never enter the solenoid nor can the B-field ever get out, if there is interaction between B and the electrons, it has to be action at a distance.
One might think that wherever the A-potential is non-vanishing, there is a field, somewhat similar to the B-field, that interacts with the charged particles which pass through the region.
What is acting at a distance in the magnetic AB experiment is the B-field which is confined in the solenoid.
Numerous experiments show that only by direct contact with an E- or B-field can an electron be deflected and its deflected trajectory observed.