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Result : Searchterm 'Gradient Coil' found in 2 terms [] and 20 definitions []
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MRI EquipmentInfoSheet: - Devices -
Types of Magnets, 
The MRI equipment consists of following components:
The magnet generates the magnetic field.
Shim coils make the magnetic field homogeneous.
Radio frequency coils transmit the radio signal into the body part being imaged.
Receiver coils detect the returning radio signals.
Gradient coils provide spatial localization of the signals.
Shielding coils produce a magnetic field that cancels the field from primary coils in regions where it is not desired.
The computer reconstructs the signals into the image.
The MRI scanner room is shielded by a faraday shield.
Different cooling systems cool the magnet, the scanner room and the technique room.
Better MRI equipment and software design along with the latest information technology improves system maintenance and overall communication. Software and digital imaging and communications in medicine (DICOM) compatibility allows to network into hospital databases, helps to modify pulse sequences, data post processing, and archiving via picture archiving and communication system (PACS).

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Magnetic ForcesMRI Resource Directory:
 - MRI Accidents -
Forces can result from the interaction of magnetic fields. Pulsed magnetic field gradients can interact with the main magnetic field during the MRI scan, to produce acoustic noise through the gradient coil.
Magnetic fields attract ferromagnetic objects with forces, which can be a lethal danger if one is hit by an unrestrained object in flight. One could also be trapped between the magnet and a large unrestrained ferromagnetic object or the object could damage the MRI machine.
Access control and personnel awareness are the best preventions of such accidents. The attraction mechanism for ferromagnetic objects is that the magnetic field magnetizes the iron. This induced magnetization reacts with the gradient of the magnetic field to produce an attraction toward the strongest area of the field. The details of this interaction are very dependent on the shape and composition of the attracted object. There is a very rapid increase of force as one approaches a magnet. There is also a torque or twisting force on objects, e.g. a long cylinder (such as a pen or an intracranial aneurysm clip) will tend to align along the magnet’s field lines. The torque increases with field strength while the attraction increases with field gradient.
Depending on the magnetic saturation of the object, attraction is roughly proportional to object mass. Motion of conducting objects in magnetic fields can induce eddy currents that can have the effect of opposing the motion.
See also Duty Cycle.

See also the related poll result: 'Most outages of your scanning system are caused by failure of'

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Further Reading:
How strong are magnets?
Magnetic Field of the Strongest Magnet
2003   by    
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Two stuck to MRI machine for 4 hrs
Tuesday, 11 November 2014   by    
Technical Assessment of Artifact Production from Neuro Endovascular Coil At 3 Tesla MRI: An In Vitro Study
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Scientists improve MRI sensitivity
Wednesday, 28 January 2009   by    
MRI Resources 
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Maxwell CoilInfoSheet: - Coils - 
etc.MRI Resource Directory:
 - Coils -
A particular kind of gradient coil, commonly used to create magnetic field gradients along the direction of the main magnetic field. The maxwell coil consists of a pair of coils separated by 1.73 times their radius. Current flows in the opposite sense in the two coils, and produces a very linear gradient.

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Oscillating Gradient System
A gradient system, which changes the readout gradient sinusoidally by connecting a capacitor to the self inductance generated by the gradient coil. Oscillating gradient systems were initially used in the development of EPI.
This electrical oscillating circuit can be driven with minimal power to generate the gradient amplitudes and switching frequencies required for echo planar imaging (EPI).
Disadvantages are that it is not possible to use any arbitrary trapezoidal gradient wave form as can be used in standard MRI. Also, the gradients are inflexible and cannot be used to create other ultrafast sequences and beside, nonlinear sampling of the MR signal is required.

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Paired Saddle CoilInfoSheet: - Coils - 
etc.MRI Resource Directory:
 - Coils -
Pairs of saddle coils (such as the Golay coils) are used as the x- and y-axis of gradient coils and as extremity coils. This configuration produces a very linear, homogeneous magnetic field along its central axis.
Images, Movies, Sliders:
 Anatomic Imaging of the Shoulder  Open this link in a new window

Courtesy of  Robert R. Edelman

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Further Reading:
High-Resolution Uniform MR Imaging of Finger Joints Using a Dedicated RF Coil at 3 Tesla
Sunday, 31 January 2010   by    
MRI Resources 
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Acoustic Noise Reduction (Silent, Quiet, etc.) :
cannot get better 
is in its first steps 
is done by earplugs, headphones 
must get better 
is bad, I miss something 
is unnecessary 


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