System and method for magnetic resonance imaging using multiple spatial encoding magnetic fields
AssigneeNational Taiwan University
InventorFa-Hsuan Lin
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Abstract
This invention provides a multi-dimensional encoded (MDE) magnetic resonance imaging (MRI) scheme to map a q-dimensional object with p spatial encoding magnetic fields (SEMs) onto a p-dimensional space where p is equal to or larger than q. The provided MDE MRI scheme links imaging schemes using linear and nonlinear gradients. The present invention also provides a system and method of optimizing the spatial bases in MDE MRI. With a higher dimension encoding space in MDE MRI, the image can be reconstructed in a more efficiency and accurate manner.
Claims11
A magnetic resonance imaging (MRI) system to image an q-dimensional object, comprising a subsystem generating a number of m of spatial encoding magnetic fields (SEMs) to encode an excited magnetization and a number of p of receiver coils for detecting the excited magnetization, characterized in that the generated SEMs are spatially bijective or non-bijective within a selected field-of-view (FOV), with m being equal to or larger than q, and in that the receiver coils have a number of spatially distinct sensitivity maps which is equal to or less than p.
A method of generating magnetic resonance images of an q-dimensional object using a magnetic resonance imaging (MRI) system having a subsystem generating a number of m of spatial encoding magnetic fields (SEMs) to encode an excited magnetization and a receiver coil array of a number of p of receiver coils for detecting the excited magnetization, comprising the steps of:
- a) choosing, from the generated SEMs, at least one SEMs having moronically field strength and direction distributions or non-monotonically field strength and direction distributions within a selected field-of-view (FOV);
- b) determining, for each of the chosen SEMs, a corresponding spatial basis from the rise time, duration, and ramp-down time of the chosen SEM;
- and
- c) reconstructing an image of the q-dimensional object based on the data points obtained at each of the receiver coils at each of the spatial bases;
- wherein the generated SEMs are spatially bijective or non-bijective within the selected FOV, with m being equal to or larger than q, and wherein the receiver coils have a number of spatially distinct sensitivity maps which is equal to or less than p.
A computer program proceeded by a processor for generating magnetic resonance images of an q-dimensional object with a magnetic resonance imaging (MRI) system having a subsystem generating a number of m of spatial encoding magnetic fields (SEMs) to encode an excited magnetization and a number of p of receiver coils for detecting the excited magnetization, the computer program comprising routines for carrying out the following:
- choosing, from the generated SEMs, at least one SEMs having moronically field strength and direction distributions or non-monotonically field strength and direction distributions within a selected field-of-view (FOV);
- determining, for each of the chosen SEMs, a corresponding spatial basis from the rise time, duration, and ramp-down time of the chosen SEM;
- and
- reconstructing an image of the n-dimensional object based on data points obtained at each of the receiver coils at each of the spatial bases;
- wherein the generated SEMs are spatially bijective or non-bijective within the selected FOV, with m being equal to or larger than q, and wherein the receiver coils have a number of spatially distinct sensitivity maps which is equal to or less than p.
Dependencies are inferred from the claim text.