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US 10,368,778 B2Granted
System and method for fast imaging in magnetic resonance imaging
AssigneeShanghai United Imaging Healthcare Co., Ltd.
InventorsGuobin Li, Chaohong Wang, Zhaopeng Li
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Abstract
A system and method for magnetic resonance imaging is provided. The method includes generating a main magnetic field through a region of interest (ROI), applying a slice selection gradient to an slice of the ROI, applying a plurality of RF pulses to the slice to generate a plurality of echoes, applying a first encoding gradient and a second encoding gradient on the echoes, and generating MR images based on the echoes.
Claims18
A method for generating a magnetic resonance (MR) image, the method comprising:
- generating a main magnetic field through a region of interest (ROI);
- applying a slice selection gradient to a slice of the ROI;
- applying a plurality of RF pulses to the slice of the ROI to generate a plurality of echoes;
- applying a first encoding gradient in a first direction and simultaneously applying a second encoding gradient in a second direction on each echo, wherein an amplitude of the first encoding gradient is always positive or always negative during a process of acquiring each echo, an absolute value of the amplitude of the first encoding gradient for acquiring a center region of a k-space is lower than an absolute value of the amplitude of the first encoding gradient for acquiring a peripheral region of the k-space, and the second encoding gradient in the second direction comprises an oscillating waveform;
- generating, based on the first encoding gradient in the first direction and the second encoding gradient in the second direction, a plurality of undersampled k-space data sets;
- and
- generating an MR image by applying at least one image reconstruction method to the undersampled k-space data sets.
4 more elements
A magnetic resonance imaging (MRI) system comprising:
- an MRI scanner, a control unit, and a processing unit, the MRI scanner comprising:
- a main magnet field generator configured to generate a main magnetic field through a region of interest (ROI);
- a gradient magnet field generator configured to apply a slice selection gradient to a slice of the ROI, to generate a first encoding gradient in a first direction, and to generate a second encoding gradient in a second direction;
- and
- an RF transmit/receive unit configured to transmit a plurality of RF pulses to the slice of the ROI to generate a plurality of echoes,
- said gradient magnet field generator being configured to apply the first encoding gradient in the first direction and the second encoding gradient in the second direction simultaneously on each echo, an amplitude of the first encoding gradient being always positive or always negative during a process of acquiring each echo, an absolute value of the amplitude of the first encoding gradient for acquiring a center region of a k-space being lower than an absolute value of the amplitude of the first encoding gradient for acquiring a peripheral region of the k-space, and the second encoding gradient in the second direction comprising an oscillating waveform;
- and
- the processing unit configured to generate a plurality of undersampled k-space data sets based on the first encoding gradient in the first direction and the second encoding gradient in the second direction, and generate an MR image by applying at least one image reconstruction method to the undersampled k-space data sets.
5 more elements
Dependencies are inferred from the claim text.