用于全身核磁共振成像的高度均匀圆极化射频场。

Highly homogeneous circularly polarized RF field for whole body NMR imaging.

作者信息

Sotgiu A, Gualtieri G, Passariello R

机构信息

Dipartimento di Scienze e Tecnologie Biomediche e Biometria, Universita' dell'Aquila, Italy.

出版信息

Magn Reson Imaging. 1988 May-Jun;6(3):249-54. doi: 10.1016/0730-725x(88)90398-0.

DOI:10.1016/0730-725x(88)90398-0

PMID:3398730

Abstract

Conditions for generation of polarized RF fields in cylindrical symmetry by high order coils are presented. Whole body NMR transmitters utilizing this principle would require a current control on a certain number of loops. In the present design this is obtained by feeding each loop by an appropriate linear combination of two in quadrature waves. The development has been experimentally tested by three scaled down experimental prototypes operated at 500 kHz and a good agreement has been found.

摘要

介绍了通过高阶线圈在圆柱对称中产生极化射频场的条件。利用这一原理的全身核磁共振发射机需要对一定数量的线圈进行电流控制。在目前的设计中，这是通过用两个正交波的适当线性组合为每个线圈供电来实现的。该进展已通过三个在500kHz运行的按比例缩小的实验原型进行了实验测试，并发现了良好的一致性。