Tesseral gradient coil for nuclear magnetic resonance tomography apparatus

US5675255A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Michael Sellers · Erlangen, DE
• Franz Boemmel · Erlangen, DE

Key dates

• Filing date: Jul 22, 1996
• Grant date: Oct 7, 1997
• Expiry date: Jul 22, 2016

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/4215
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A tesseral gradient coil is composed of at least two coil segments spaced in axial direction, each coil segment being composed of at least two windings symmetrically arranged relative to a middle line of an interior of the nuclear magnetic resonance apparatus. Each winding has an outer winding part, lying on a larger radius around the middle axis and an inner part lying on a smaller radius around the middle axis of the interior. The two winding parts are oppositely traversed by current. The number of ampere-turns of the outer winding part of each winding is lower than the number of ampere-turns of the inner winding part.