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Gradient Amplifier
 
In MRI systems, the gradient amplifier increases the energy of the signal before it reaches the gradient coils, in a way, that the field strength is intense enough to produce the variations in the main magnetic field for localization of the later received signal. Three gradient coils normally require three gradient amplifiers. As all amplifiers, gradient amplifiers produce heat, which requires cooling.


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Amplifier
 
Hardware components from MRI systems. The radio frequency (RF) amplifier increases the power (measured in Watt) of the pulses from mW to kW and the gradient amplifier increases the power of the gradient pulses for the gradient coils.
See also Hardware.
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Further Reading:
  Basics:
Tech Spotlight: How to calibrate an MRI RF amplifier
Saturday, 1 December 2012   by medicaldesign.com    
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Eddy Current Compensation
 
Eliminate Gibb's artifact (Border ringing) for sharp images. Means of reducing the influence of eddy currents on pulsed gradient fields by employing an electrical preemphasis in the gradient amplifiers. Usually multiple time constants have to be used to correct for eddy current effects in various structures of the MR system such as the cryoshields and RF-shields.
See also Eddy Currents and Shielded Gradient Coils.

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Further Reading:
  Basics:
Generic Eddy Current Compensation for Rapid Magnetic Resonance Imaging(.pdf)
   by www.switt.ch    
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RELAX 0.35T™InfoSheet: - Devices -
Intro, 
Types of Magnets, 
Overview, 
etc.MRI Resource Directory:
 - Devices -
 
www.isoltech.co.kr/english/product/035t.htm From ISOL Technology
'RELAX is open type MRI system created by making up for the weakness of existing conventional MR systems and applying the strength and the application of the middle to high field MR without uncompromising the image quality.
RELAX offers you a premium mix of form, performance and functionality that are patient and user friendly beyond comparison. - New breed of MRI pursuing - patients comfort'

Device Information and Specification
CLINICAL APPLICATION Whole body
CONFIGURATION Open
SURFACE COILS Head, C-spine, L-spine, TMJ, Knee, Shoulder, General purpose, Phased Array System: 4 digital receiver channels (Up to 12 channels)
SYNCHRONIZATION ECG/peripheral: Optional/yes, respiratory gating
PULSE SEQUENCES 2D/3D Spin echo, 2D/3D Gradient echo, 2D/3D Fast spin echo, Inversion recovery, 2D/3D Fast gradient echo sequences, FLAIR/STIR, 2D/3D TOF
IMAGING MODES 3D volume imaging (MIP, MPR) MR Angiography package
FOV 30 cm
MAGNET TYPE Permanent
BORE DIAMETER
or W x H
40 cm diameter (patient)
MAGNET WEIGHT 13500 kg
H*W*D 170 x 210 x 130 cm
COOLING SYSTEM TYPE Water-cooled coil and air-cooled amplifier
FIELD STRENGTH 0.35 T
STRENGTH 25 - 30 mT/m
5-GAUSS FRINGE FIELD lower than 2.4 m from the iso-center
SHIMMING Passive and active
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FORTE 3.0T™InfoSheet: - Devices -
Intro, 
Types of Magnets, 
Overview, 
etc.MRI Resource Directory:
 - Devices -
 
www.isoltech.co.kr/english/product/30t.htm From ISOL Technology
'Ultra high field MR system , it's right close to you. FORTE 3.0T is the new standard for the future ultra high field MR system. If you are pushing the limits of your existing clinical MR scanner, the FORTE will surely take you to the next level of diagnostic imaging. FORTE is the core leader of the medical technology in the 21st century. Proving effects of fMRI that cannot be measured with MRI less than 2.0T.'
Device Information and Specification
CLINICAL APPLICATION Whole body
CONFIGURATION Short bore compact
SURFACE COILS Head, C-spine, L-spine, TMJ, Knee, Shoulder, General purpose
SPECTROSCOPY Yes
SYNCHRONIZATION ECG/peripheral: Optional/yes, external trigger, respiratory gating
PULSE SEQUENCES Spin echo, Gradient echo, Fast spin echo, Inversion recovery, 2D/3D Fast gradient echo sequences FLAIR/STIR, 2D/3D TOF
IMAGING MODES 2D/3D, T1, T2 and Diffusion//Perfusion imaging, MR Angiography package, Advanced EPI package, Multi-nuclei MR Spectroscopy package
FOV 40 cm
DISPLAY MATRIX 128 x 128, 256 x 256, 512 x 512, 1024 x 1024
MAGNET TYPE Superconducting
BORE DIAMETER
or W x H
61 cm without body coil
MAGNET WEIGHT 12000 kg
H*W*D 260 x 220 x 235 cm
COOLING SYSTEM TYPE Water-cooled coil and air-cooled amplifier
CRYOGEN USE 0.15 L/hr helium
FIELD STRENGTH 3.0T
STRENGTH 38 mT/m
5-GAUSS FRINGE FIELD 3.3 m / 5.2 m
SHIMMING Passive and active
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