Method for sensing nuclear magnetic resonance signals given arbitrary gradient shapes

US5087880A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Herbert Bruder · Hemhofen, DE
• Hubertus Fischer · Bamberg, DE
• Hans-Erich Reinfelder · Erlangen, DE
• Franz Schmitt · Erlangen, DE

Key dates

• Filing date: Feb 22, 1990
• Grant date: Feb 11, 1992
• Expiry date: Feb 22, 2010

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/56545
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A method for operating a nuclear resonance imaging device given gradients of arbitrary shapes includes the steps of equidistantly sampling the nuclear magnetic resonance signals in the time domain with a sampling rate that satisfies the sampling theorem, the sampling taking place even given gradients having a non-rectangular pulse shape. Since non-equidistant sampling in the K-space would normally lead to image artifacts, the method includes the further step, to avoid such artifacts, of calculating measured values from the acquired samples by interpolation, these measured values being equidistant in the K-space, and being entered into a measurement matrix. The equidistant sampling in the K-space, which is complicated, is thus superfluous given gradients having an arbitrary pulse shape.