Method for determining a radio-frequency transmission pulse for a magnetic resonance scan, a magnetic resonance apparatus, and a computer program product
AssigneeSiemens Healthineers AG
InventorDavid Grodzki
Life of this patent
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Abstract
A method, a magnetic resonance apparatus, and a computer program product are disclosed. In particular, a method is provided for determining an RF transmission pulse for a magnetic resonance scan by a magnetic resonance apparatus including a gradient coil unit. The method includes a provision of a deviation information item, wherein the deviation information item characterizes a position-dependent deviation from a target state, caused by the gradient coil unit, in an imaging region of the magnetic resonance apparatus. The RF transmission pulse is determined taking account of the deviation information item.
Claims11
A computer-implemented method for determining a radio-frequency (RF) transmission pulse for a magnetic resonance scan of an examination object by a magnetic resonance apparatus comprising a gradient coil unit, the method comprising:
- providing, by a computing unit, a deviation information item, wherein the deviation information item characterizes a position-dependent deviation from a target state, caused by the gradient coil unit, in an imaging region of the magnetic resonance apparatus, wherein the deviation information item comprises a deformation map that defines spatial displacements of a plurality of image points of a magnetic resonance image, and wherein the deformation map attributes a respective spatial position according to the target state to a respective spatial position of an actual state for each image point of the plurality of image points;
- providing, by the computing unit, an initial target state in a position space;
- determining, by the computing unit, a modified target state in the position space relative to the initial target state using the deformation map taking into account non-linearities of the gradient coil unit;
- determining, by the computing unit, a transformed target state in a k-space by transformation of the modified target state into the k-space;
- determining, by the computing unit, the RF transmission pulse based on the transformed target state, wherein the RF transmission pulse is a dynamic pulse;
- conducting, by the magnetic resonance apparatus, the magnetic resonance scan of the examination object;
- and
- transmitting the RF transmission pulse, by a radio frequency antenna unit of the magnetic resonance apparatus, during the magnetic resonance scan.
A magnetic resonance apparatus comprising:
- a computing unit;
- and
- a gradient coil unit,
- wherein the magnetic resonance apparatus is configured to:
- provide, by the computing unit, a deviation information item, wherein the deviation information item characterizes a position-dependent deviation from a target state, caused by the gradient coil unit, in an imaging region of the magnetic resonance apparatus, wherein the deviation information item comprises a deformation map that defines spatial displacements of a plurality of image points of a magnetic resonance image, and wherein the deformation map attributes a respective spatial position according to the target state to a respective spatial position of an actual state for each image point of the plurality of image points;
- provide, by the computing unit, an initial target state in a position space;
- determine, by the computing unit, a modified target state in the position space relative to the initial target state using the deformation map taking into account non-linearities of the gradient coil unit;
- determine, by the computing unit, a transformed target state in a k-space by transformation of the modified target state into the k-space;
- and
- determine, by the computing unit, a radio-frequency (RF) transmission pulse based on the transformed target state, wherein the RF transmission pulse is a dynamic pulse;
- conduct a magnetic resonance scan of an examination object;
- and
- transmit the RF transmission pulse, by a radio frequency antenna unit of the magnetic resonance apparatus, during the magnetic resonance scan.
A non-transitory computer program product comprising a program configured to be loaded directly into a memory store of a programmable computing unit of a magnetic resonance apparatus, wherein, when the program is executed in the programmable computing unit of the magnetic resonance apparatus, the program is configured to cause the magnetic resonance apparatus to:
- provide a deviation information item, wherein the deviation information item characterizes a position-dependent deviation from a target state, caused by a gradient coil unit of the magnetic resonance apparatus, in an imaging region of the magnetic resonance apparatus, wherein the deviation information item comprises a deformation map that defines spatial displacements of a plurality of image points of a magnetic resonance image, and wherein the deformation map attributes a respective spatial position according to the target state to a respective spatial position of an actual state for each image point of the plurality of image points;
- provide an initial target state in a position space;
- determine a modified target state in the position space relative to the initial target state using the deformation map taking into account non-linearities of the gradient coil unit;
- determine a transformed target state in a k-space by transformation of the modified target state into the k-space;
- determine a radio-frequency (RF) transmission pulse based on the transformed target state, wherein the RF transmission pulse is a dynamic pulse;
- conduct a magnetic resonance scan of an examination object;
- and
- transmit the RF transmission pulse, by a radio frequency antenna unit of the magnetic resonance apparatus, during the magnetic resonance scan by the magnetic resonance apparatus.
Dependencies are inferred from the claim text.