Method for generating spin echo pulse sequences in a nuclear spin tomograph, and nuclear spin tomograph adapted for carrying out such method

US4896112A · kind A · utility

Assignee

• Bruker Medizintechnik GmbH · DE

Inventors

• Dieter Ratzel · Rheinstetten, DE
• Norbert Schuff · Heidelberg, DE

Key dates

• Filing date: Sep 7, 1988
• Grant date: Jan 23, 1990
• Expiry date: Sep 7, 2008

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/56518
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In nuclear spin tomography disturbances are encountered as a result of the insertion of the gradient fields, which disturbances are due to the generation of eddy currents and lead to field distortions making themselves felt, among other things, in the rapid decay of the echo signals of spin echo pulse sequences, i.e. in disturbances of the rephasing conditions. According to the invention, the rephasing conditions required for generating spin echo impulse sequences can be established either by varying the value of the static magnetic field between the excitation pulse and the next following rf pulse of a spin echo pulse sequence, or else by adjusting the interval between the excitation pulse and the next following rf pulse to a value different from half the interval between the subsequent rf pulses.