Method of distortion correction for gradient non-linearities in nuclear magnetic resonance tomography apparatus

US5886524A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventor

• Robert Krieg · Koblenzer Straße, DE

Key dates

• Filing date: Oct 29, 1996
• Grant date: Mar 23, 1999
• Expiry date: Oct 29, 2016

Classification

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

Abstract

In a method of distortion correction for gradient non-linearities in a nuclear magnetic resonance tomography apparatus, two auxiliary datasets h(x,), f(x,y) are measured that describe the shift of a measured location (x',y') relative to an actual location (x,y) of a signal origin. A corrected auxiliary dataset h(x+f(x,y), y) is produced from the auxiliary dataset h(x,y). A location correction in y-direction ensues in an image dataset upon employment of the corrected auxiliary dataset h(x+f(x,y), y). A first intensity correction also ensues. A location correction in x-direction subsequently ensues with a second intensity correction. Alternatively, the location correction can also ensue by Fresnel transformation of the raw dataset upon involvement of the corrected auxiliary data h(x+f(x,y), y).