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Gradient Magnetic Field
 
A small linear magnetic field applied in addition to (superimposed on) the large static magnetic field in a MRI scanner. The strength (amplitude) and direction of the gradient fields change during the scan, which allows each small volume element (voxel) within the imaging volume to resonate at a different frequency. In this way, spatial encoding may be performed.
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Magnetic Field
   by hyperphysics.phy-astr.gsu.edu    
Electrical eddy currents in the human body: MRI scans and medical implants
   by www.phy.olemiss.edu    
MRI Resources 
MRI Technician and Technologist Jobs - Safety Training - Guidance - Chemistry - General - Pediatric and Fetal MRI
 
Gradient Magnetic Field Symbols
 
Gx, Gy, Gz - conventional symbols for gradient magnetic field. x, y, z denote spatial direction component of gradient, i.e. direction along that the field changes.
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MRI Resources 
Diffusion Weighted Imaging - MRI Physics - IR - Spectroscopy - MR Myelography - RIS
 
Active Shielding
 
Magnetic shielding through the use of secondary shielding coils designed to produce a magnetic field that cancels the field from primary coils in regions where it is not desired. These coils may be inside the magnet cryostat. Active shielding can be applied to the main magnet or to the gradient magnetic fields.

See also Magnetic Shielding, Self Shielding and Room Shielding.
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Gradient CoilForum -
related threadsInfoSheet: - Coils - 
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Current carrying coils designed to produce a desired magnetic field gradient (so that the magnetic field will be stronger in some locations than others).
Proper design of the size and configuration of the coils is necessary to produce a controlled and uniform gradient. Three paired orthogonal current-carrying coils located within the magnet that are designed to produce desired gradient magnetic fields, which collectively and sequentially are superimposed on the main magnetic field (B0) so that selective spatial excitation of the imaging volume can occur.
Gradients are also used to apply reversal pulses in some fast imaging techniques. Gradient coils in general vary the main magnetic field, so that each signal can be related to an exact location. The gradient coil configuration for the z-axis consists of e.g., Helmholtz pair coils, and of paired saddle coils for the x- and y-axis.

See also the related poll result: 'Most outages of your scanning system are caused by failure of'
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Further Reading:
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Electrical eddy currents in the human body: MRI scans and medical implants
   by www.phy.olemiss.edu    
HEAD AND NECK MRI GRADIENT COIL DESIGN
Thursday, 26 August 1999   by www.imaging.robarts.ca    
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Gradient Pulse
 
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Flow comp off: An easy technique to confirm CSF flow within syrinx and aqueduct
Wednesday, 2 January 2013   by medind.nic.in    
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Services and Supplies - Software - Breast Implant - Absorption and Emission - Shoulder MRI - Jobs pool
 
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