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Applications and Advanced Features Gradient Linearity Definitions
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GRADIENTS WITH INTEGRATED SHIMS - BFG-S SERIES |
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RRI gradient coils are capable of very fast image acquisition and rise times below 100 ms due to a low stored energy and highly effective cancellation of eddy currents. The use of field uniformity and gradient linearity criteria in the coil design results in images with low distortion. |
Minimized eddy currents Fast image acquisition with low distortion |
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The cancellation of eddy currents occurs through careful matching of the coil and shield designs and use of passive or active amp-turn equalization techniques. The cancellation of eddy currents minimizes the distortion during pulses and the generation of image artifacts, thus generating high quality images. |
High signal-to-noise High contrast-to-noise Highest image quality |
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Enhanced performance is reached using a shielded B0 compensation coil. This coil compensates for the coupling between the magnet and the gradient, thus nulling the image shift and artifact generation. |
Management of coil coupling |
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The BFG-S series of gradient coils includes integrated shim coils of very high strength and purity. RRI has developed and patented a unique zero-coupling design for the Z family of shims, which allows operation of the Z shims with no coupling to the magnet coils. |
High strength and purity shims Zero coupling Z family shim coils |
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Because of their low DC resistance, BFG gradient coils generate minimized heat and can be operated at higher duty cycles. The temperature raise is further
controlled using multiple cooling paths and impregnation with high
thermal conductivity resins for better heat transfer. |
High duty cycles Unique cooling system |
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RRI gradients are designed for large DSV’s that match the uniformity volume of the magnet, thus maximizing the use of the bore space. |
Maximized use of magnet bore space |
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Low vibration and acoustic modulation of the gradient coils is achieved by using a total resin impregnation technique, which also contributes to lower acoustic noise and higher durability of the gradient system. |
Ruggedized construction |
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