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US 2002/0171422 A1Published application
Calibration method for use with sensitivity encoding MRI acquisition
AssigneeGE Medical Systems Global Technology Company, LLC
InventorKevin F. King
Life of this patent
Estimating the term…
Abstract
Calibration data is acquired during a prescan in an MRI system from each local coil in a coil array. The calibration data is used to calculate a sensitivity matrix S which is employed in a SENSE technique to reconstruct an MR image acquired with the same local coils.
Claims17
A method for producing an image of a subject with a magnetic resonance imaging (MRI) system, the steps comprising:
- a) performing a pulse sequence with the MRI system to acquire calibration data with each of N local coils positioned near the subject;
- b) performing a prescribed imaging pulse sequence with the MRI system to acquire image data with each of the N local coils;
- c) reconstructing calibration images with the calibration data;
- d) calculate a coil sensitivity image for each local coil using the calibration images;
- e) forming a sensitivity matrix S from the coil sensitivity images;
- f) reconstructing an image I from the acquired image data;
- and
- g) calculating a proton distribution image M using the sensitivity matrix S and the image I.
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A method for producing a sensitivity matrix S for a set of N local coils, the steps comprising:
- a) positioning a subject to be imaged in a magnetic resonance imaging (MRI) system;
- b) positioning the set of N local coils near the subject;
- c) acquiring calibration data by performing a pulse sequence with the MRI system and acquiring a calibration image
- 7 I j cal
- with each local coil;
- d) calculating a coil sensitivity image Sj for each local coil using the calibration images;
- and
- e) forming the sensitivity matrix S from the coil sensitivity images.
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Dependencies are inferred from the claim text.