Correction of the effect of gradient field non-linearities in phase contrast MRI

US7202662B2 · kind B2 · utility

Assignee

• The Board of Trustees of the Leland Stanford Junior University · US

Inventors

• Michael Markl · Chicago, US
• Norbert J. Pelc · Wauwatosa, US
• Roland Bammer · Palo Alto, US

Key dates

• Filing date: Jun 16, 2003
• Grant date: Apr 10, 2007
• Expiry date: Sep 8, 2025

Classification

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

Abstract

Errors in qualitative phase contrast measurements due to gradient field heterogeneities are reduced by using either a generalized reconstruction algorithm or an approximate reconstruction algorithm. True velocities are calculated using measured velocity information and phase differences, first moments of gradients, and gyromagnetic ratio.