Method and system for B0 drift and respiratory motion compensation in echo-planar based magnetic resonance imaging
First Claim
1. A method for B0 drift and respiratory motion compensation in echo-planar based magnetic resonance imaging (MRI) comprising:
- obtaining at least two phase images of a target region of a patient from each of a first echo-planar imaging (EPI) acquisition and a second EPI acquisition;
generating a first susceptibility map based on the at least two phase images of the target region of the patient obtained from the first EPI acquisition and a second susceptibility map based on the at least two phase images of the target region of the patient obtained from the second EPI acquisition;
initializing a smooth polynomial function for modeling the B0 drift and respiratory motion between the first EPI acquisition and the second EPI acquisition based on the first and second susceptibility maps; and
iteratively reconstructing a compensated temperature map showing temperature changes in tissue in the target region of the patient based on the smooth polynomial function to compensate for temperature map inaccuracies due to B0 drift and respiratory motion.
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Accused Products
Abstract
A method and apparatus for B0 correction in echo-planar (EP) based magnetic resonance image (MRI) is disclosed. Two phase images are obtained from each of a first echo-planar imaging (EPI) acquisition and a second EPI acquisition. A first susceptibility map is generated based on the two phase images obtained from the first EPI acquisition and a second susceptibility map is generated based on the two phase images obtained from the second EPI acquisition. A smooth polynomial function for modeling the B0 drift and respiratory motion between the first EPI acquisition and the second EPI acquisition is initialized based on the first and second susceptibility maps. A compensated temperature map is then iteratively reconstructed based on the smooth polynomial function.
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Citations
28 Claims
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1. A method for B0 drift and respiratory motion compensation in echo-planar based magnetic resonance imaging (MRI) comprising:
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obtaining at least two phase images of a target region of a patient from each of a first echo-planar imaging (EPI) acquisition and a second EPI acquisition; generating a first susceptibility map based on the at least two phase images of the target region of the patient obtained from the first EPI acquisition and a second susceptibility map based on the at least two phase images of the target region of the patient obtained from the second EPI acquisition; initializing a smooth polynomial function for modeling the B0 drift and respiratory motion between the first EPI acquisition and the second EPI acquisition based on the first and second susceptibility maps; and iteratively reconstructing a compensated temperature map showing temperature changes in tissue in the target region of the patient based on the smooth polynomial function to compensate for temperature map inaccuracies due to B0 drift and respiratory motion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An apparatus for B0 drift and respiratory motion compensation in echo-planar based magnetic resonance imaging (MRI) comprising:
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a processor; and a memory storing computer program instructions which when executed by the processor cause the processor to perform operations comprising; obtaining at least two phase images of a target region of a patient from each of a first echo-planar imaging (EPI) acquisition and a second EPI acquisition; generating a first susceptibility map based on the at least two phase images of the target region of the patient obtained from the first EPI acquisition and a second susceptibility map based on the at least two phase images of the target region of the patient obtained from the second EPI acquisition; initializing a smooth polynomial function for modeling the B0 drift and respiratory motion between the first EPI acquisition and the second EPI acquisition based on the first and second susceptibility maps; and iteratively reconstructing a compensated temperature map showing temperature changes in tissue in the target region of the patient based on the smooth polynomial function to compensate for temperature map inaccuracies due to B0 drift and respiratory motion. - View Dependent Claims (14, 15, 16, 17)
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18. A non-transitory computer readable medium storing computer program instructions for B0 drift and respiratory motion compensation in echo-planar based magnetic resonance imaging (MRI), the computer program instructions when executed by a processor cause the processor to perform operations comprising:
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obtaining at least two phase images of a target region of a patient from each of a first echo-planar imaging (EPI) acquisition and a second EPI acquisition; generating a first susceptibility map based on the at least two phase images of the target region of the patient obtained from the first EPI acquisition and a second susceptibility map based on the at least two phase images of the target region of the patient obtained from the second EPI acquisition; initializing a smooth polynomial function for modeling the B0 drift and respiratory motion between the first EPI acquisition and the second EPI acquisition based on the first and second susceptibility maps; and iteratively reconstructing a compensated temperature map showing temperature changes in tissue in the target region of the patient based on the smooth polynomial function to compensate for temperature map inaccuracies due to B0 drift and respiratory motion. - View Dependent Claims (19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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Specification