Shielded biplanar gradient coil design.
نویسندگان
چکیده
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 minimize the fifth-order terms in the magnetic field expansion.
منابع مشابه
Fast optimization of a biplanar gradient coil set.
This work presents an approach for fast optimization of gradient coils, using the simulated annealing method. The shielding condition derived from a target field method and the analytical evaluation of the fields produced by simple geometries were used to reduce the computing time. This method is applied to the optimization of a shielded biplanar gradient coil set. Efficiency, inductance, and h...
متن کاملOptimization of Planar Stream Functions for Gradient Coil Design
This work presents the Fast Simulated Annealing method for the design of self-shielded gradient coils with biplanar geometry. This method is based on the stochastic optimization of parameterized stream functions, which can be modeled by a few free parameters and can be used for coil designs with different (a) size or (b) number of turns. Gradient coils designed by this method produce magnetic f...
متن کاملFinite size disc gradient coil set for open vertical field magnets.
A new analytical approach is used in the design of disc-like gradient coils suitable for magnet geometries with main field direction perpendicular to the surface of the disc. An inverse procedure is used to optimize the coil's characteristics, subject to the restrictions imposed by the desired field behavior over a certain set of constraint points inside a predetermined imaging volume. Excellen...
متن کاملOptimization of Biplanar Gradient Coils for Magnetic Resonance Imaging
“Open” magnetic resonance imaging (MRI) scanners are frequently based on electromagnets or permanent magnets, and require self-shielded planar gradient coils to prevent image artifacts resulting from eddy currents in metallic parts of the scanner. This work presents an optimization method for the development of self-shielded gradient coils with biplanar geometry for “Open” MRI scanners. Compare...
متن کاملAn optimized target-field method for MRI transverse biplanar gradient coil design
Gradient coils are essential components of magnetic resonance imaging (MRI) systems. In this paper, we present an optimized target-field method for designing a transverse biplanar gradient coil with high linearity, low inductance and small resistance, which can well satisfy the requirements of permanent-magnet MRI systems. In this new method, the current density is expressed by trigonometric ba...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
- Journal of magnetic resonance imaging : JMRI
دوره 9 5 شماره
صفحات -
تاریخ انتشار 1999