An application of the target field method to the design of shielded biplanar gradient coils for magnetic resonance imaging electromagnets is presented. Some specific cases are studied, and optimized geometries are proposed for the axial and transverse gradient coils that eliminate the third- and min
Design and evaluation of shielded gradient coils
β Scribed by J. W. Carlson; K. A. Derby; K. C. Hawryszko; M. Weideman
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 939 KB
- Volume
- 26
- Category
- Article
- ISSN
- 0740-3194
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β¦ Synopsis
Abstract
Techniques are described for the design of shielded gradient coils for superconducting MRI systems. These design methods are suited for constructing the most efficient gradient coil that meets a specified homogeneity requirement. Tradeoffs in coil design of efficiency with coil size and gap size are discussed. Residual eddy currents from coils constructed with a finite number of wires are calculated and give guidelines for the construction of efficient, wholeβbody gradient coils.
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Ultrashort gradient coils for ultrashort cylindrical MRI systems require new design methods. The challenge is to reduce system length while maintaining performance, e.g., to maintain acceptable linearity and uniformity over a large field of view (FoV). Trading MR system performance to achieve short
A distributed coil design is described which employs active force shielding to reduce acoustic noise. Both axial and transverse gradients employ sets of distributed pairs of coplanar closed-arc loops whose planes are normal to the static magnetic field direction. The resulting gradients are also par
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## Abstract Alternate expressions for the current density on the shielding surface of a gradient coil are derived for cylindrical, planar, and hyperbolic gradient coils. For the planar and hyperbolic geometries, these expressions allow more rapid highβprecision calculations of current densities tha