Method and apparatus for accelerating magnetic resonance imaging
First Claim
1. A method of magnetic resonance (MR) imaging with spatial encoding for generating an image of an object of investigation inside an MR apparatus, the method comprising the steps of:
- a) selecting a volume of interest within the object of investigation;
b) applying a radio frequency (RF) pulse to generate a transverse magnetization within the object of investigation;
c) effecting spatial encoding through application of spatially encoding magnetic fields;
d) recording and storing MR signals originating from the object of investigation and assigning those signals to old MR data;
e) physically removing the object of investigation from the MR apparatus following step d);
f) repositioning the object inside the MR apparatus following step e);
g) repeating steps a) through d) for recording further MR signals originating from the same object of investigation to record and store new MR data, whereby step c) is performed by undersampling the k-space for shortening a measurement time;
h) correcting the old MR data recorded in step d) for changes in a new position of the object of investigation relative to the MR apparatus in step g);
i) correcting the old MR data recorded in step d) for changes in a sensitivity and exact spatial positioning of RF receiver coils of the MR apparatus in step g);
j) correcting old MR data recorded in step d) for changes in an actual B0 magnetic field of the MR apparatus in step g); and
k) reconstructing a high resolution MR image of the object of investigation from a synthesis of the old MR data recorded and stored in step d) and corrected in steps h), i) and j) with the new MR data recorded in step g).
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Abstract
A method of MRI entails recording and storing MR signals from an object to produce an old set of data. A further measurement of the object is then initiated at a later time to record new MR data, whereby k-space is undersampled in the further measurement. The old data are corrected for changes in the new position of the object, for changes in the sensitivity and exact spatial positioning of the receiver coils as well as for changes in the actual field shimming. The old and new data are then combined to create a new, high resolution image of the object.
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Citations
13 Claims
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1. A method of magnetic resonance (MR) imaging with spatial encoding for generating an image of an object of investigation inside an MR apparatus, the method comprising the steps of:
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a) selecting a volume of interest within the object of investigation; b) applying a radio frequency (RF) pulse to generate a transverse magnetization within the object of investigation; c) effecting spatial encoding through application of spatially encoding magnetic fields; d) recording and storing MR signals originating from the object of investigation and assigning those signals to old MR data; e) physically removing the object of investigation from the MR apparatus following step d); f) repositioning the object inside the MR apparatus following step e); g) repeating steps a) through d) for recording further MR signals originating from the same object of investigation to record and store new MR data, whereby step c) is performed by undersampling the k-space for shortening a measurement time; h) correcting the old MR data recorded in step d) for changes in a new position of the object of investigation relative to the MR apparatus in step g); i) correcting the old MR data recorded in step d) for changes in a sensitivity and exact spatial positioning of RF receiver coils of the MR apparatus in step g); j) correcting old MR data recorded in step d) for changes in an actual B0 magnetic field of the MR apparatus in step g); and k) reconstructing a high resolution MR image of the object of investigation from a synthesis of the old MR data recorded and stored in step d) and corrected in steps h), i) and j) with the new MR data recorded in step g). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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Specification