Claims
- 1. A body motion corrective imaging method comprising the steps of:
- generating a static magnetic field, a gradient magnetic field and a high-frequency magnetic field;
- measuring a Nuclear Magnetic Resonance (NMR) data from an object under examination to which said magnetic fields are applied;
- computing an intermediate data by one-dimensional Fourier transformation from said NMR data;
- computing an amount of motion of projection data at each point of said intermediate data on the basis of correlation between said intermediate data;
- modifying said NMR data on the basis of said amount of the motion of said projection data; and
- reconstructing an image of said object from said modified data.
- 2. The body motion corrective imaging method as recited in claim 1 wherein said NMR data includes an image signal measurement data and a projection measurement data.
- 3. The body motion corrective imaging method as recited in claim 2 wherein said image signal measurement data is modified on the basis of said amount of motion of said projection data.
- 4. In an imaging system which measures an NMR data, a method for body motion corrective imaging comprising the steps of:
- transforming an NMR data acquired by the imaging system to create an intermediate data by performing a Fourier transformation on the NMR data along one of its dimensions:
- producing a movement data table using the intermediate data by correlating each row of the intermediate data to produce a corresponding shift value for the movement data table of projection data;
- applying the data in the movement data table to NMR data measured by the imaging system to reduce artifacts caused by motion in the acquired NMR data; and
- producing an image of an object to be inspected from the reduced NMR data.
- 5. The body motion corrective imaging method as recited in claim 4 wherein said applying step includes a step of performing a Fourier transformation on said NMR data along one of its dimensions.
- 6. The body motion corrective imaging method as recited in claim 5 wherein the NMR data to create said intermediate data is a projection measurement data.
- 7. The body motion corrective imaging method as recited in claim 6 wherein each of said projection measurement data is acquired in the same pulse sequence with its corresponding NMR data.
- 8. A body motion corrective imaging apparatus comprising:
- a means for generating a static magnetic field, a gradient magnetic field and a high-frequency magnetic field;
- means for measuring an NMR data from an object under examination to which said magnetic fields are applied;
- means for computing an intermediate data by one-dimensional Fourier transformation from said NMR data;
- means for computing an amount of motion of projection data at each point of said intermediate data on the basis of correlation between said intermediate data;
- means for modifying said NMR data on the basis of said amount of the motion; and
- means for reconstructing an image of said object from said modified data.
- 9. A body motion corrective imaging apparatus for an NMR imaging system, said apparatus comprising:
- means for transforming an NMR data acquired to create an intermediate data by performing a Fourier transformation on the NMR data along one of its dimensions:
- means for producing a movement data table of projection data by using the intermediate data by correlating each row of the intermediate data to produce a corresponding shift value for the movement data table;
- means for applying the data in the movement data table to an NMR data measured to reduce artifacts caused by motion in the acquired NMR data; and
- means for producing an image of an object to be inspected from the reduced NMR data.
- 10. The apparatus as recited in claim 9 in which said applying means includes means for performing a Fourier transformation on said NMR data along one of its dimensions.
- 11. The apparatus as recited in claim 9 wherein the NMR data to create said intermediate data is a projection measurement data.
- 12. The apparatus as recited in claim 11 wherein each of said projection measurement data is acquired in the same pulse sequence with its corresponding NMR data.
Priority Claims (1)
Number |
Date |
Country |
Kind |
63-78007 |
Apr 1988 |
JPX |
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Parent Case Info
This is a continuation of application Ser. No. 07/330,835, filed Mar. 30, 1989, now U.S. Pat. No. 5,023,553.
US Referenced Citations (2)
Number |
Name |
Date |
Kind |
4937526 |
Ehman et al. |
Jun 1990 |
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5023553 |
Sano et al. |
Jun 1991 |
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Continuations (1)
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Number |
Date |
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Parent |
330835 |
Mar 1989 |
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