MAGNETIC RESONANCE METHOD AND SYSTEM TO CORRECT PHASE INFORMATION IN MR IMAGES
First Claim
1. A method to correct phase information in magnetic resonance (MR) images of a volume segment of an examination subject, comprising;
- placing an examination subject in an MR data acquisition unit and operating the MR data acquisition unit to apply a basic magnetic field at least to a predetermined volume segment of the examination subject and to acquire MR data from the predetermined volume segment, said MR data representing image elements of said predetermined volume segment;
in a processor, evaluating said MR data to calculate phase information for each of said image elements of said predetermined volume segment;
operating said MR data acquisition unit to acquire a navigator signal that detects a change in said basic magnetic field caused by a source selected from the group consisting of movement of the examination subject, and said MR data acquisition unit itself; and
in said processor, correcting said phase information dependent on said navigator signal.
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Accused Products
Abstract
In a magnetic resonance (MR) method and system for correction of phase information in MR images of a predetermined volume segment of an examination subject, a basic magnetic field is applied and MR data of the predetermined volume segment are acquired and evaluated such that phase information is calculated for each image element of the predetermined volume segment. A navigator signal is acquired that detects an unintentional change of the basic magnetic field that is caused by movements of the examination subject or by the magnetic resonance system itself. The phase information is corrected with this navigator signal.
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Citations
14 Claims
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1. A method to correct phase information in magnetic resonance (MR) images of a volume segment of an examination subject, comprising;
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placing an examination subject in an MR data acquisition unit and operating the MR data acquisition unit to apply a basic magnetic field at least to a predetermined volume segment of the examination subject and to acquire MR data from the predetermined volume segment, said MR data representing image elements of said predetermined volume segment; in a processor, evaluating said MR data to calculate phase information for each of said image elements of said predetermined volume segment; operating said MR data acquisition unit to acquire a navigator signal that detects a change in said basic magnetic field caused by a source selected from the group consisting of movement of the examination subject, and said MR data acquisition unit itself; and in said processor, correcting said phase information dependent on said navigator signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A magnetic resonance (MR) system comprising:
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an MR data acquisition unit configured to receive an examination subject therein, said MR data acquisition unit comprising a basic field magnet; a control unit configured to operate the MR data acquisition unit to apply a basic magnetic field, with said basic field manget, at least to a predetermined volume segment of the examination subject and to acquire MR data from the predetermined volume segment, said MR data representing image elements of said predetermined volume segment; a processor configured to evaluate said MR data to calculate phase information for each of said image elements of said predetermined volume segment; said control unit being configured to operate said MR data acquisition unit to acquire a navigator signal that detects a change in said basic magnetic field caused by a source selected from the group consisting of movement of the examination subject, and said MR data acquisition unit itself; and said processor being configured to correct said phase information dependent on said navigator signal.
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14. A non-transitory, computer-readable data storage medium encoded with programming instructions, said data storage medium being loaded into a computerized control and evaluation unit of a magnetic resonance (MR) system that comprises an MR data acquisition unit, having a basic field magnet, and a computerized control and evaluation system, said programming instructions causing said control and evaluation system of said magnetic resonance imaging system to:
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operate the MR data acquisition unit to apply a basic magnetic field, with said basic field magnet, at least to a predetermined volume segment of an examination subject in the MR data acquisition unit and to acquire MR data from the predetermined volume segment, said MR data representing image elements of said predetermined volume segment; evaluate said MR data to calculate phase information for each of said image elements of said predetermined volume segment; operate said MR data acquisition unit to acquire a navigator signal that detects a change in said basic magnetic field caused by a source selected from the group consisting of movement of the examination subject, and said MR data acquisition unit itself; and correct said phase information dependent on said navigator signal.
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Specification