Patent · US Expired

Magnet system for nuclear spin tomography having superconducting coils and a cold shield

US4833433A · kind A · utility

3Cited by

5References

14Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Dieter Schmettow · Erlangen, DE
Guenter Ries · Erlangen, DE

Key dates

Filing date	Apr 21, 1988
Grant date	May 23, 1989
Priority date	—
Expiry date	Apr 21, 2008

Classification

Technology area (CPC G)Physics
CPC primaryG01R33/3815
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

A magnet system for a nuclear spin tomography installation contains annular superconducting coils for generating a magnetic background field and nonsuperconducting gradient coils. A hollow cylindrical thermal shield fits between the gradient coils and the superconducting coils. According to the invention, the thermal shield at the front faces is formed from tubular end pieces. The front faces have a greater specific electrical resistance than a tubular intermediate piece of the thermal shield that extends between the end pieces and cover at least the area of the gradient coils.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.