Pulse sequence for operating a nuclear magnetic resonance tomography apparatus for producing images with different T.sub.2 contrast

US4901020A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Ralf Ladebeck · Erlangen, DE
• Hubertus Fischer · Bamberg, DE
• Franz Schmitt · Erlangen, DE

Key dates

• Filing date: Mar 23, 1989
• Grant date: Feb 13, 1990
• Expiry date: Mar 23, 2009

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/50
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A pulse sequence is disclosed for operating a nuclear magnetic resonance tomography apparatus for producing images having different T.sub.2 contrast. A signal for the gradient-echo imaging is first acquired after excitation of the nuclei subsequently, the magnetization, which is already prepared for imaging, is refocused by a 180.degree. radio-frequency pulse, and a second echo is measured in the presence of a readout gradient. Independent images having different T.sub.2 contrast can be reconstructed with the gradient echo and with the spin echo. It is thus possible to simultaneously measure a gradient echo image having a significantly lower T.sub.2 contrast during the measuring time for a spin echo image.