System and Method for Random Cartesian Acquisition with Projection Reconstruction-Like Sampling

摘要

A system and method are provided for producing a magnetic resonance image of a subject with a magnetic resonance imaging (MRI) system. The method includes acquiring k-space image data from a subject arranged in an MRI system by performing a pulse sequence. To perform the pulse sequence the MRI system divides k-space into a plurality of radially-extending sectors extending along a radial direction away from an origin of k-space. The plurality of radially-extending sectors include a width transverse to the radial direction that is defined by a vane angle chosen to be greater than a floating point precision of the trigonometric functions that define the radially-extending sectors. The MRI system acquires imaging data from at least the radially-extending sectors to undersample the periphery of k-space by only sampling k-space within the plurality of radial sectors and reconstructs an image of the subject using the imaging data.

主权项

1. A method for producing a magnetic resonance image of a subject with a magnetic resonance imaging (MRI) system, the method comprising the steps of:
a) acquiring k-space image data from a subject arranged in an MRI system by performing a pulse sequence comprising the steps of:
i) determining a k-space sampling pattern that divides k-space into a central region and periphery of k-space surrounding the central region;ii) dividing the periphery of k-space into a plurality of radially-extending sectors extending along a radial direction away from the central region, wherein the plurality of radially-extending sectors include a width transverse to the radial direction that is defined by a vane angle chosen to be a sufficiently small value to cause a point spread function (PSF) to have a primary two-dimensional cross-correlation 10- to 1000-fold larger than the primary side-lobe;iii) acquiring imaging data from at least the radially-extending sectors to undersample the periphery of k-space by only sampling k-space within the plurality of radial sectors; b) reconstructing an image of the subject using the imaging data.