System and Method For Gradient Measurement Using Single-Point Imaging

摘要

A system and method for determining an actual gradient field generated by a magnetic resonance imaging (MRI) system when controlled to produce a prescribed gradient field is provided. The techniques include using the prescribed gradient field, controlling the MRI system to perform a phase encoding including a gradient that is scaled along each direction desired to be measured over a selected number of encoding times and acquiring one-dimensional (1D) data using a prescribed k-space trajectory during the phase encoding. The 1D data is used to determine scaling factors between encoding times that correlate to actual k-space trajectories achieved when controlling the gradient coils to perform the phase encoding based on the desired gradient field and a report is generated that provides a measure of the actual gradient field generated when controlling the MRI system to produce the prescribed gradient field.

主权项

1. A magnetic resonance imaging (MRI) system comprising:
a magnet system configured to generate a polarizing magnetic field about at least a portion of a subject arranged in the MRI system; a plurality of gradient coils configured to apply a gradient field to the polarizing magnetic field; a radio frequency (RF) system configured to apply an excitation field to the subject and acquire MR image data therefrom; a computer system programmed to determining an actual gradient field generated by the plurality of gradient coils when controlled to produce a prescribed gradient field by:
based on a desired gradient field, controlling the gradient coils to perform a phase encoding including a gradient that is scaled along each direction desired to be measured over a selected number of encoding times;controlling the RF system to acquire one-dimensional (1D) data using a prescribed k-space trajectory during the phase encoding;using the 1D data, determining scaling factors between encoding times that correlate to actual k-space trajectories achieved when controlling the gradient coils to perform the phase encoding based on the desired gradient field; andgenerating a report providing a measure of the actual gradient field generated by the plurality of gradient coils when controlled to produce the prescribed gradient field.