Patent US6230040B1 successfully refreshed from Google Patents.
US6230040B1
Expired / Lapsed
US
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Method for performing magnetic resonance angiography with dynamic k-space sampling
Assignee: Cornell Research Foundation Inc
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Filing: 1997-11-21
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Granted: 2001-05-08
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Expires: 2017-11-21
Abstract
Abstract MRA data is acquired from a large region of interest by translating the patient to successive stations at which successive portions of the three-dimensional MRA data set are acquired. Patient movement is chosen to track a bolus of contrast agent as it passes through the region of interest and a 3D acquisition is performed at a succession of stations. The order and shape in which k-space is sampled differs from station-to-station to achieve maximum image contrast.
Inventors
- 👤 Yi Wang
- 👤 Howard M. Lee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 07:51
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/44; G01R33/48; G01R33/4818; G01R33/482; G01R33/4822; G01R33/54; G01R33/56; G01R33/563; G01R33/561; G01R33/5619; G01R33/56308
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
156 words
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 using an NMR pulse sequence in which imaging gradients are changed to sample a first k-space which is tailored in size and shape in a first predetermined sampling scheme; c) translating the patient in the MRI system; d) acquiring NMR image data from the patient over a second field of view using an NMR pulse sequence in which imaging gradients are changed to sample a second k-space which is tailored in size and shape that is different than said first k-space in a second predetermined sampling scheme; and e) registering the NMR image data acquired over the first and second fields of view and reconstructing an image over a region of interest which includes the first and second fields of view.
Claim 2
Independent Claim
156 words
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 using an NMR pulse sequence in which imaging gradients are changed to sample a first k-space which is tailored in size and shape in a first predetermined sampling scheme; c) translating the patient in the MRI system; d) acquiring NMR image data from the patient over a second field of view using an NMR pulse sequence in which imaging gradients are changed to sample a second k-space which is tailored in size and shape that is different than said first k-space in a second predetermined sampling scheme; and e) registering the NMR image data acquired over the first and second fields of view and reconstructing an image over a region of interest which includes the first and second fields of view.
Claim 3
Dependent Claim
36 words
The method as recited in claim 1 in which the k-space sampling performed in step b) is performed in a descending order and the k-space sampling performed in step d) is performed in an ascending order.
Claim 4
Dependent Claim
43 words
The method as recited in claim 2 which includes: administering a contrast agent to the patient; and timing the performance of steps b) and d) such that the contrast agent provides substantial signal enhancement when sampling said first k-space and said second k-space.
Claim 5
Dependent Claim
24 words
The method as recited in claim 3 in which the NMR pulse sequences used in steps b) and d) are three-dimensional NMR pulse sequences.
Claim 6
Dependent Claim
29 words
The method as recited in claim 1 in which the first k-space and the second k-space are tailored from a set of sampling shapes including: asymmetric; diamond; and circular.
Claim 7
Independent Claim
148 words
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 using an NMR pulse sequence in which imaging gradients are changed to sample in descending order a first k-space which is tailored in size and shape; c) translating the patient in the MRI system; d) acquiring NMR image data from the patient over a second field of view using an NMR pulse sequence in which imaging gradients are changed to sample in ascending order a second k-space which is tailored in size and shape differently than said first k-space; and e) registering the NMR image data acquired over the first and second fields of view and reconstructing an image over a region of interest which includes the first and second fields of view.
Claim 8
Independent Claim
148 words
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 using an NMR pulse sequence in which imaging gradients are changed to sample in descending order a first k-space which is tailored in size and shape; c) translating the patient in the MRI system; d) acquiring NMR image data from the patient over a second field of view using an NMR pulse sequence in which imaging gradients are changed to sample in ascending order a second k-space which is tailored in size and shape differently than said first k-space; and e) registering the NMR image data acquired over the first and second fields of view and reconstructing an image over a region of interest which includes the first and second fields of view.
Claim 9
Dependent Claim
43 words
The method as recited in claim 6 which includes: administering a contrast agent to the patient; and timing the performance of steps b) and d) such that the contrast agent provides substantial signal enhancement when sampling said first k-space and said second k-space.
Claim 10
Dependent Claim
24 words
The method as recited in claim 7 in which the NMR pulse sequences used in steps b) and d) are three-dimensional NMR pulse sequences.
Claim 11
Dependent Claim
29 words
The method as recited in claim 6 in which the first k-space and the second k-space are tailored from a set of sampling shapes including: asymmetric; diamond; and circular.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2004-05-07 | 2004-11-06 | 2005-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2008-05-07 | 2008-11-06 | 2009-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2012-05-07 | 2012-11-06 | 2013-05-08 | $7700.00 | Window Closed / Lapsed |