Method for performing diffusion weighted magnetic resonance measurements

US11525880B2 · kind B2 · utility

Assignee

• Random Walk Imaging AB · SE

Inventors

• Filip Szczepankiewicz · Lund, SE
• Markus Nilsson · Espoo, FI

Key dates

• Filing date: Sep 7, 2018
• Grant date: Dec 13, 2022
• Expiry date: Sep 7, 2038

Classification

• Technology area (CPC G): Physics
• CPC primary: G01R33/56581
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

Disclosed is a method for generating a time-dependent magnetic field gradient in diffusion weighted magnetic resonance imaging G(t)=[Gx(t)Gy(t)Gz(t)]T, which is asymmetric in time with respect to a refocusing pulse, by meeting one or more of the requirements: A=∫0TEh(t)G(t)G(t)Tdt is zero, where TE is an echo time and h(t) is a function of time which is positive during an interval prior to the refocusing pulse and negative during a time interval after the refocusing pulse); minimize A or m=(Tr[AA])1/2 where A=∫P1G(t)G(t)Tdt−∫P2G(t)G(t)Tdt where P1 and P2 represent time intervals prior to and subsequent to the refocusing pulse; m is smaller than a threshold value. an attenuation factor due to T2* relaxation is one. Signal attenuation due to concomitant field gradients, regardless of the shape or orientation of the diffusion encoding b-tensor and the location of signal is hereby minimized.