magnetic field gradient

magnetic field gradient
in magnetic resonance imaging, the change in the magnetic field in a given direction.

Medical dictionary. 2011.

Look at other dictionaries:

  • Magnetic field — This article is about a scientific description of the magnetic influence of an electric current or magnetic material. For the physics of magnetic materials, see magnetism. For information about objects that create magnetic fields, see magnet. For …   Wikipedia

  • Pulsed field gradient — A Pulsed field gradient is a short, timed pulse with spatial dependent field intensity. Any gradient is identified by four characteristics: axis, strength, shape and duration. Pulsed field gradient (PFG) techniques are key to magnetic resonance… …   Wikipedia

  • Electric field gradient — Mathematically, the electric field gradient (EFG) is the hessian matrix (the matrix of the second derivatives) of the electrical potential V: :V {ij} = frac{partial^2 V}{partial x i partial x j}It is an important structural property of a… …   Wikipedia

  • Earth's magnetic field — Computer simulation of the Earth s field in a normal period between reversals.[1] The tubes represent magnetic field lines, blue when the field points towards the center and yellow when away. The rotation axis of the Earth is centered and… …   Wikipedia

  • Mercury's magnetic field — Magnetosphere of Mercury Graph showing relative strength of Mercury s magnetic field. Discovery[1] …   Wikipedia

  • Force-free magnetic field — A force free magnetic field is a type of field which arises as a special case from the magnetostatic equation in plasmas. This special case arises when the plasma pressure is so small, relative to the magnetic pressure, that the plasma pressure… …   Wikipedia

  • Gradient enhanced NMR spectroscopy — Gradient enhanced NMR is a method for obtaining high resolution nuclear magnetic resonance spectra without the need for phase cycling . Gradient methodology is used extensively for two purposes, either rephasing (selection) or dephasing… …   Wikipedia

  • Magnetic resonance microscopy — (MRM, µMRI) is Magnetic Resonance Imaging (MRI) at a microscopic level. A strict definition is MRI having voxel resolutions of better than 100 µm³ [1]. Contents 1 Nomenclature 2 Differences between MRI and MRM …   Wikipedia

  • Magnetic resonance force microscopy — (MRFM) is an imaging technique that acquires magnetic resonance images (MRI) at nanometer scales, and possibly at atomic scales in the future. MRFM is potentially able to observe protein structures which cannot be seen using X ray crystallography …   Wikipedia

  • Magnetic trap — refers to one of three types of traps used for atoms or charged particles: Magnetic trap (atoms), used to trap neutral atoms in a magnetic field gradient Penning trap, used to trap charged particles or ions in a combination of electrostatic… …   Wikipedia