Spatially encoded phase-contrast MRI

摘要

A method of collecting magnetic resonance data for imaging an object with a predetermined spin density being arranged in a static magnetic field, comprises the steps subjecting said object to at least one radiofrequency pulse and magnetic field gradients for creating spatially encoded magnetic resonance signals, including at least two settings of spatially encoding phase-contrast gradients differently encoding the phase of said magnetic resonance signals in at least one field of view in a predetermined spatial dimension, acquiring at least two magnetic resonance signals, each with one of said at least two settings of different spatially encoding phase-contrast gradients, and determining at least one mean spin density position of said object along said spatial dimension by calculating the phase difference between said signals. Furthermore, a control device and a magnetic resonance imaging (MRI) device implementing the method are described.

主权项

1. A method of collecting magnetic resonance data for three-dimensional imaging of an object with a spin density distributed along an object layer, said object being arranged in an object space in a static magnetic field, comprising the following steps:
(a) subjecting said object to at least one spatially non-selective radiofrequency pulse and magnetic field gradients for creating spatially encoded magnetic resonance signals, including at least two settings of spatially encoding phase-contrast gradients differently encoding a phase of said magnetic resonance signals in at least one field of view in a predetermined spatial dimension, (b) acquiring at least two magnetic resonance signals, each with one of said at least two settings of different spatially encoding phase-contrast gradients, wherein two two-dimensional magnetic resonance images are acquired which represent projections of the object onto a projection plane in the object space with said at least two settings of different spatially encoding phase-contrast gradients along a spatial dimension perpendicular to said projection plane, and (c) determining at least one mean spin density position of said object along said spatial dimension by calculating a phase difference between said two two-dimensional magnetic resonance images and determining a three-dimensional image of said object.