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US 11,892,532 B2Granted
Whole-blade acquisition and phase correction in magnetic resonance imaging
AssigneeDignity Health
InventorsZhiqiang Li, John P. Karis
Life of this patent
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Abstract
Various embodiments of a system and associated method for whole-blade acquisition and phase correction for fast and robust MR imaging are disclosed herein. In particular, the system enables sampling of odd and even k-space echoes in the same k-space as well as a whole-blade phase correction strategy to achieve improved image quality at an accelerated imaging rate.
Claims30
A method, comprising:
- accessing, by a processor in communication with a memory, a k-space blade echo signal sampled by a magnetic resonance device in communication with the processor, the k-space blade echo signal including a plurality of sub-blade echoes, the plurality of sub-blade echoes including a set of sub-blade echoes including a gradient-echo sub-blade echo and a spin-echo sub-blade echo;
- transforming, by the processor, each sub-blade echo individually into image space;
- accessing, by the processor, calibration data for each sub-blade echo of the plurality of sub-blade echoes;
- generating, by the processor, a plurality of phase maps by transformation of the calibration data into image space, the plurality of phase maps including:
- a gradient-echo phase map that corresponds to calibration data for the gradient-echo sub-blade echo;
- and
- a spin-echo phase map that corresponds to calibration data for the spin-echo sub-blade echo;
- generating, by the processor, a gradient-echo phase difference map
- that corresponds to a phase difference between the gradient-echo phase map and the spin-echo phase map of the plurality of phase maps;
- second and
- correct, by the processor, a phase of each gradient-echo sub-blade echo to align with the spin-echo sub-blade echo by removing the gradient-echo phase difference map from the gradient-echo sub-blade in image space.
8 more elements
A method, comprising:
- accessing, by a processor in communication with a memory, a k-space blade echo signal sampled by a magnetic resonance device in communication with the processor, the k-space blade echo signal including a plurality of sub-blade echoes, the plurality of sub-blade echoes including a plurality of odd sub-blade echoes including an odd spin-echo sub-blade echo and a plurality of even sub-blade echoes including an even spin-echo sub-blade echo;
- transforming, by the processor, each sub-blade echo of the plurality of sub-blade echoes individually into image space;
- generating, by the processor, a spin-echo phase difference map corresponding to a phase difference between the odd spin-echo sub-blade echo and the even spin-echo sub-blade echo in image space;
- and
- correcting, by the processor, a phase of a sub-blade echo of the plurality of sub-blade echoes to align with the even spin-echo sub-blade echo or the odd spin-echo sub-blade echo in image space by:
- removing the spin-echo phase difference map from each odd sub-blade echo of the plurality of sub-blade echoes in image space to align with the even spin-echo sub-blade echo;
- or
- removing the spin-echo phase difference map from each even sub-blade echo of the plurality of sub-blade echoes in image space to align with the odd spin-echo sub-blade echo.
5 more elements
A system, comprising:
- a processor in communication with a memory, the memory including instructions executable by the processor to:
- access a k-space blade echo signal by a magnetic resonance device in communication with the processor, the k-space blade echo signal including a plurality of sub-blade echoes, the plurality of sub-blade echoes including:
- a set of odd sub-blade echoes, the set of odd sub-blade echoes including a first odd gradient echo sub-blade echo, a second odd gradient echo sub-blade echo, and an odd spin-echo sub-blade echo;
- and
- a set of even sub-blade echoes, the set of even sub-blade echoes including a first even gradient echo sub-blade echo, a second even gradient echo sub-blade echo, and an even spin-echo sub-blade echo;
- transform each sampled sub-blade echo of the k-space blade echo signal individually into image space;
- correct a phase of each odd sub-blade echo to align with the odd spin-echo sub-blade echo in image space;
- and
- correct a phase of each even sub-blade echo of the set of even sub-blades echo to align with the even spin-echo sub-blade echo in image
- access calibration data for each sub-blade echo of the plurality of sub-blades of the k-space blade echo signal;
- and
- transform the calibration data into image space to generate:
- a set of odd sub-blade phase maps, the set of odd sub-blade phase data including a first odd gradient echo phase map, a second odd gradient echo phase map, and an odd spin-echo phase map;
- and
- a set of even sub-blade phase maps, the set of even phase data including a first even gradient echo phase map, a second even gradient echo phase map, and an even spin-echo phase map.
12 more elements
Dependencies are inferred from the claim text.