Echo-spacing shuffling for echo-planar-imaging

US11815583B2 · kind B2 · utility

Assignees

• Siemens Healthcare Limited · DE
• University of Glasgow · GB

Inventors

• Patrick Liebig · Erlangen, DE
• David Andrew Porter · Hanover, US
• Robin Heidemann · Strullendorf, DE

Key dates

• Filing date: Jun 24, 2022
• Grant date: Nov 14, 2023
• Expiry date: Jun 24, 2042

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/56366
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

The disclosure is directed to an Echo-Planar-Imaging (EPI) magnetic resonance imaging techniques combined with a variable-density undersampling scheme. The technique comprises generating an RF pulse, applying a switched frequency-encoding read out gradient in a variable time interval, and applying simultaneously an intermittently blipped low-magnitude phase-encoding gradient with a variable value of an integral of the phase-encoding gradient. The aforementioned steps are carried out such that the k-space is at least partially undersampled and the time interval of one read out gradient is varied depending on the integral of the phase encoding gradient, such that a ratio between the variable time interval of the read out gradient and the integral of the corresponding phase encoding gradient is kept above or at a predetermined constant value, which is related to a predetermined criteria of image quality.