B1 field map with contrast medium injection
AssigneeSiemens Healthineers AG
InventorRalf Kartäusch
Life of this patent
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Abstract
A method is provided for determining a movement-corrected B1 field map on contrast medium injection, wherein before the injection, a B1 field map is determined. Following the contrast medium administration, a position change is determined at the position at which the B1 field map was determined. With the position change and the B1 field map, the movement-corrected B1 field map is determined.
Claims17
A method for recording magnetic resonance (MR) signals from a person under examination in a MR system, wherein a contrast medium is injected into the person under examination, the method comprising:
- recording MR signals in a first scan portion for generating a single, first B1 field map of the person under examination before contrast medium administration;
- determining a position of the person under examination in the MR system before the contrast medium administration;
- recording MR signals of the person under examination in a second scan portion after the contrast medium administration, with which a dynamic contrast medium distribution in the person under examination is configured to be acquired;
- recording MR signals in a third scan portion for determination of a position of the person under examination in the MR system after the contrast medium administration received by the person under examination during the third scan portion;
- determining a position change of the person under examination between the position of the person under examination before the contrast medium administration and the position of the person under examination after the contrast medium administration;
- transforming the first B1 field map using the determined position change of the person under examination to provide a single person-specific movement-corrected B1 field map;
- recording MR signals of the person under examination in a fourth scan portion;
- and
- processing the MR signals of the fourth scan portion using the person-specific movement-corrected B1 field map.
A magnetic resonance (MR) system configured to record MR signals from a person under examination, wherein a contrast medium is configured to be injected into the person under examination, wherein the MR system comprises at least one receiving coil for recording MR signals, a control unit, and a memory unit, wherein the memory unit stores control information items executable by the control unit, and wherein the MR system, on execution of the control information items in the control unit, is configured to:
- record MR signals in a first scan portion for generating a single, first B1 field map of the person under examination before contrast medium administration,
- determine a position of the person under examination in the MR system before the contrast medium administration,
- record MR signals of the person under examination in a second scan portion after the contrast medium administration, with which a dynamic contrast medium distribution in the person under examination is configured to be acquired;
- record MR signals in a third scan portion for the determination of a position of the person under examination in the MR system after the contrast medium administration received by the person under examination takes during the third scan portion;
- determine a position change of the person under examination between the position of the person under examination before the contrast medium administration and the position of the person under examination after the contrast medium administration;
- transform the first B1 field map using the determined position change of the person under examination to provide a single person-specific movement-corrected B1 field map;
- record MR signals of the person under examination in a fourth scan portion;
- and
- process the MR signals of the fourth scan portion with the person-specific movement-corrected B1 field map.
A computer program product comprising program code, wherein the computer program product is directly loadable into a memory unit of a control unit of a magnetic resonance (MR) system, wherein the computer program product, when executed in the control unit, is configured to cause the MR system to:
- record MR signals in a first scan portion for generating a single, first B1 field map of a person under examination before contrast medium administration,
- determine a position of the person under examination in the MR system before the contrast medium administration,
- record MR signals of the person under examination in a second scan portion after the contrast medium administration, with which a dynamic contrast medium distribution in the person under examination is configured to be acquired;
- record MR signals in a third scan portion for the determination of a position of the person under examination in the MR system after the contrast medium administration received by the person under examination takes during the third scan portion;
- determine a position change of the person under examination between the position of the person under examination before the contrast medium administration and the position of the person under examination after the contrast medium administration;
- transform the first B1 field map using the determined position change of the person under examination to provide a single person-specific movement-corrected B1 field map;
- record MR signals of the person under examination in a fourth scan portion;
- and
- process the MR signals of the fourth scan portion with the person-specific movement-corrected B1 field map.
Dependencies are inferred from the claim text.