Patent ID: 11890086
Assignee: MARTIN R. PRINCE
Field: Measurement (Instruments)
Classification: CPC A  G | IPC A  G

Claim 8:
9. A method for producing a time-resolved, three-dimensional contrast enhanced magnetic resonance image, the method comprising:
enhancing contrast in a tissue;
applying a first radio frequency (RF) pulse over a scan time;
sampling a first plurality of resonance data along a first spiral trajectory in a corresponding image spatial frequency domain defined by a plurality of parallel planes, each parallel plane including at least one group of interleaves, the first spiral trajectory corresponding to a first of the plurality of parallel planes and within the group of interleaves, the first spiral trajectory originating at a first center in the first of the plurality of parallel planes and spiraling outward towards a first edge in the first of the plurality of parallel planes;
applying a second RF pulse over a scan time;
sampling a second plurality of resonance data along a second spiral trajectory in the corresponding image spatial frequency domain, the second spiral trajectory corresponding to a second of the plurality of parallel planes, the second spiral trajectory originating at a second center in the second of the plurality of parallel planes within the group of interleaves and spiraling outward towards a second edge in the second of the plurality of parallel planes; and
reconstructing the magnetic resonance image using at least the first plurality of resonance data and the second plurality of resonance data, with a frame reconstructed for each group of interleaves wherein for n groups of interleaves the frame time is 1/nth of the scan time; and
wherein:
the first spiral trajectory has a first sampling density at the first center and a second sampling density at the first edge that is less than the first sampling density;

the first spiral trajectory radius increases linearly with respect to azimuthal angle at the first center;
the second spiral trajectory has a third sampling density at the second center and a fourth sampling density at the second edge that is less than the third sampling density; and
wherein the first sampling density and the third sampling density are each a constant sampling density over a predetermined plurality of spatial frequencies,
the third sampling density decreases non-linearly to the fourth sampling density.