Field of view increase in magnetic resonance imaging using nonlinear gradients and generalized iterative reconstruction
First Claim
Patent Images
1. A method for increasing field of view (FOV) in magnetic resonance imaging, the method comprising:
- determining linear field gradients of associated with a gradient coil of a magnetic resonance (MR) scanner;
using the MR scanner to acquire a k-space dataset representative of a patient using a plurality of readout gradient amplitudes;
generating an extended FOV image based on the k-space dataset using an iterative reconstruction process that applies a forward model to convert the k-space data set to image space, wherein the forward model incorporates a measurement of gradient distortion as a deviation from the linear field gradients.
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Abstract
A method for increasing field of view (FOV) in magnetic resonance imaging includes determining linear field gradients of associated with a gradient coil of a magnetic resonance (MR) scanner and using the MR scanner to acquire a k-space dataset representative of a patient using a plurality of readout gradient amplitudes. An extended FOV image is generated based on the k-space dataset using an iterative reconstruction process to solve a forward model that incorporates a measurement of gradient distortion as a deviation from the linear field gradients.
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Citations
20 Claims
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1. A method for increasing field of view (FOV) in magnetic resonance imaging, the method comprising:
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determining linear field gradients of associated with a gradient coil of a magnetic resonance (MR) scanner; using the MR scanner to acquire a k-space dataset representative of a patient using a plurality of readout gradient amplitudes; generating an extended FOV image based on the k-space dataset using an iterative reconstruction process that applies a forward model to convert the k-space data set to image space, wherein the forward model incorporates a measurement of gradient distortion as a deviation from the linear field gradients. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A system for increasing field of view (FOV) in magnetic resonance imaging, the system comprising:
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a plurality of coils configured to acquire a k-space dataset representative of a patient using a plurality of readout gradient amplitudes; a control computer configured to reconstruct an extended FOV image of the patient based on the k-space dataset using a process comprising; determining linear field gradients associated with the plurality of coils, and generating the extended FOV image based on the k-space dataset using an iterative reconstruction process that applies a forward model to convert the k-space data set from image space to projection space, wherein the forward model incorporates a measurement of gradient distortion as a deviation from the linear field gradients. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17, 18)
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19. A system for performing extended FOV imaging, the system comprising:
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a MRI scanner configured to acquire a k-space dataset representative of a patient using a plurality of readout gradient amplitudes; one or more computers configured to; generate an extended FOV image based on the k-space dataset using an iterative reconstruction process that applies a forward model to convert the k-space data set to image space, wherein the forward model incorporates a measurement of gradient distortion as a deviation from linear field gradients associated with the MRI scanner, and generate a full body model of the patient based on the extended FOV image; and a PET scanner configured to perform a PET acquisition of the patient using the full body model. - View Dependent Claims (20)
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Specification