Method and magnetic resonance apparatus for setting a shim to homogenize a magnetic field in the apparatus
First Claim
1. A method for setting a shim to homogenize a magnetic field of a magnetic resonance apparatus, said magnetic field being generated in the magnetic resonance apparatus to assist in acquiring magnetic resonance exposures of a predetermined examination region, comprising the steps of:
- in a computer, at least semi-automatically designating a three-dimensional volume that is relevant for setting a shim for acquiring magnetic resonance data from an examination region using an examination protocol, said computer at least automatically setting said three-dimensional volume matched to at least one of said examination region and said examination protocol by selecting said three-dimensional volume from a plurality of arbitrary morphology sets of selectable volumes, not limited to specific volume shapes, or by generating said three-dimensional volume as an arbitrary three-dimensional volume not limited to a specific volume shape; and
in said computer, automatically calculating said shim for said three-dimensional volume that has been at least semi-automatically designated, and making the calculated shim available as an output from the computer in a form for implementing said shim in said magnetic resonance apparatus.
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Accused Products
Abstract
In a method for determination or adaptation of a shim for homogenization of a magnetic field of a magnetic resonance apparatus, which magnetic field is provided for the generation of magnetic resonance exposures of a specific examination region, an automatic determination, of a computer and/or supported by an operator on an image output unit of the computer, is made of a three-dimensional volume that is relevant for the determination or adaptation of the shim and that is matched to the examination region and/or an examination protocol by selection from an arbitrary morphology set of selectable volumes (which morphology set is not limited to specific shapes) and/or by generation of an arbitrarily three-dimensional volume not limited to specific shapes. The computer then automatically calculates the shim for the determined or selected three-dimensional volume.
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Citations
19 Claims
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1. A method for setting a shim to homogenize a magnetic field of a magnetic resonance apparatus, said magnetic field being generated in the magnetic resonance apparatus to assist in acquiring magnetic resonance exposures of a predetermined examination region, comprising the steps of:
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in a computer, at least semi-automatically designating a three-dimensional volume that is relevant for setting a shim for acquiring magnetic resonance data from an examination region using an examination protocol, said computer at least automatically setting said three-dimensional volume matched to at least one of said examination region and said examination protocol by selecting said three-dimensional volume from a plurality of arbitrary morphology sets of selectable volumes, not limited to specific volume shapes, or by generating said three-dimensional volume as an arbitrary three-dimensional volume not limited to a specific volume shape; and in said computer, automatically calculating said shim for said three-dimensional volume that has been at least semi-automatically designated, and making the calculated shim available as an output from the computer in a form for implementing said shim in said magnetic resonance apparatus. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A magnetic resonance apparatus comprising:
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a basic field magnet that generates a basic magnetic field to assist in acquiring magnetic resonance exposures of a predetermined examination; a shim arrangement that homogenizes said basic magnetic field; a computer that at least semi-automatically designates a three-dimensional volume that is relevant for setting said shim arrangement for acquiring magnetic resonance data from the examination region using an examination protocol, said computer at least automatically setting said three-dimensional volume matched to at least one of said examination region and said examination protocol by selecting said three-dimensional volume from a plurality of arbitrary morphology sets of selectable volumes, not limited to specific volume shapes, or by generating said three-dimensional volume as an arbitrary three-dimensional volume not limited to a specific volume shape; and said computer automatically calculating values for setting said shim arrangement for said three-dimensional volume that has been at least semi-automatically designated, and making the calculated values available as an output from the computer in a form for setting said shim arrangement in said magnetic resonance apparatus. - View Dependent Claims (19)
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Specification