Resonance Research Inc.
GRADIENTS
Shielded gradients with integrated shims for animal imaging
With maximized duty cycles and gradient strength, short rise times, very high gradient uniformity and large DSV, the BFG series of high performance gradients was designed for advanced techniques and applications, such as echo-planar imaging, angiography and localized spectroscopy at high magnetic fields.
Design parameters of each unit from this series can be customized to match the parameters of existing gradient amplifiers.? The BFG series is supplied with 14 channels of integrated shims, or 7 channels of extra strong shims that can be driven at higher currents.
Z2 and Z4 shim coils are wound using NetZeroTM technology, which prevents coupling to the magnet coils.
Micro Imaging shielded gradients
Most frequently applied to vertical bore magnets used for spectroscopy, RRI’s microscopy gradients operate at strengths of 1,000 mT/m, with very high gradient uniformity and short rise times. Microscopy gradients are fully compatible with industry standard shim systems, including RRI’s serial and matrixshim RT shims.
Please click here to view images obtained with RRI’s micro-imaging gradient coils.
RRI’s gradients for microscopy can be operated with most gradient amplifiers and are compatible with the high stability BFH gradient amplifiers.
Gradients with integrated shims
RRI’s gradient series for diffusion and solids include some of the strongest anisotropic gradients currently available, with gradient strengths up to 15 mT/m.
Gradients for diffusion and solids can be integrated with serial 18-channels shim systems.
SHIM POWER SUPPLY
Shielded power supplies
The MXH shim power supplies are capable of dealing with the challenge brought by fast MRI imaging: maintaining a constant shim current in the presence of extremely strong gradient pulses.?
Coupling between shim and gradient coils causes injection of high bandwidth current pulses into the shim coils, resulting in a time-dependent de-shimming of the magnet, thus generating reconstruction artifacts. The intensity and complexity of these coupling mechanisms are particularly strong in high-performance gradient coils such as those used for EPI, cardiac imaging.?? This is especially important at 3T and higher field magnets, and in cases where asymmetric gradients and short magnets are being used. ?
The MXH series of shim power supplies are the only product line in the market designed for, and capable of,? managing coil coupling, while providing very high stability and short setting times.
The MXH shim power supplies are based on high-gain, dual stage current amplifiers with linear output stages, capable of high-current DC drive and high-bandwidth AC compliance controlling the injection of energy into the RT shim system.? This system is complemented by an optimized RF enclosure? penetration panel.
The MXH shim power supplies are self-contained and include three-phase AC to DC power supplies with integrated forced air cooling. ?An intelligent interface featuring RS-232 control, 16-bit, optically isolated digital-to-analog converters, current monitoring, safety and diagnostic circuitry are included.? Other interface protocols are also available. ??
The capabilities of the MXH series of shim power supplies can be fully experienced when combined with BFG-S integrated gradient and shim systems.?
Real Time Shimming
The Load&GoTM shimming technology allows real time shim adjustment on slice, voxel or region of interest.
This technology significantly benefits challenging shimming situations, such as:
- Air/tissue interfaces, which generate imaging artifacts, such as areas of the brain in the vicinity of sinuses. ?
- EPI and other advanced imaging techniques and applications in general.
- Compensation of motion artifacts due to respiration or cardiac cycles.
- Animal imaging at very high fields, where very efficient compensation of the subject’s magnetic susceptibility is essential.
SHIMS
Single-Shot, Spin-Echo EPI of Rat Brain at 11,7T
MICRO-IMAGING, SOLIDS AND DIFFUSION
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