Method for performing magnetic resonance angiography over a large field of view using table stepping
First Claim
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1. A method for producing an image with an MRI system, the steps comprising:
- a) positioning a patient in the MRI system;
b) acquiring NMR image data from the patient over a first field of view while the patient is stationary relative to the MRI system;
c) translating the patient in the MRI system;
d) acquiring NMR image data from the patient over a second field of view while the patient is stationary relative to the MRI system;
e) registering the NMR image data acquired over the first and second field of views and reconstructing an image over a region of interest which includes the first and second field of views.
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Abstract
MRA data is acquired from a large region of interest by translating the patient to successive stations at which successive portions of the MRA data set are acquired. Patient movement is chosen to track a bolus of contrast agent as it passes through the region of interest to achieve maximum image contrast. In one embodiment a stationary local coil is supported adjacent the patient to acquire the MRA data and in another embodiment a multi-segment local coil moves with the patient and its segments are sequentially switched into operation.
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11 Claims
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1. A method for producing an image with an MRI system, the steps comprising:
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a) positioning a patient in the MRI system; b) acquiring NMR image data from the patient over a first field of view while the patient is stationary relative to the MRI system; c) translating the patient in the MRI system; d) acquiring NMR image data from the patient over a second field of view while the patient is stationary relative to the MRI system; e) registering the NMR image data acquired over the first and second field of views and reconstructing an image over a region of interest which includes the first and second field of views. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A method for producing an image with an MRI system, the steps comprising:
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a) performing a timing scan in which a contrast agent is administered to a patient and the arrival time and the velocity of the contrast agent in a region of interest is estimated from NMR data acquired by the MRI system; b) performing a bolus tracking scan to acquire NMR data from the region of interest by translating the patient to a plurality of stations and acquiring NMR image data from a corresponding plurality of field of views within the region of interest; and c) reconstructing the image from NMR data acquired from all of said field of views; wherein the start of the bolus tracking scan is determined by said estimated arrival time and the translation of the patient to said plurality of stations is timed in part by said estimated velocity.
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Specification