Patent US5697370A successfully refreshed from Google Patents.
US5697370A
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Method for increasing temporal resolution of MR fluoroscopy
Assignee: General Electric Co
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Filing: 1996-01-17
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Granted: 1997-12-16
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Expires: 2016-01-17
Abstract
Abstract A method is described for increasing the temporal resolution of MR fluoroscopy procedures. A central portion of the image requiring a higher temporal resolution is updated more frequently using less-than-complete newly acquired NMR data. A running average of the signals produced by peripheral structures is used to form the periphery of the image and to remove artifact-producing data from the less-than-complete NMR data.
Inventors
- 👤 Norbert J. Pelc
- 👤 Stephen G. Hushek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 14:05
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/44; G01R33/48; G01R33/54; G01R33/56; G01R33/561; G01R33/4818; G01R33/4824; G01R33/5619
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
134 words
A method for producing a series of images with an MRI system, the steps comprising: a) acquiring NMR data comprised of a full set of measurements from which an image having a selected field of view may be reconstructed; b) transforming the acquired NMR data to reconstruct a static image which forms part of the selected field of view; c) producing synthetic raw data from the static image which indicates structures located in the substantially static portion of the field of view; d) acquiring new NMR data using less than a full set of measurements; e) subtracting the synthetic raw data from the new NMR data to produce corrected new NMR data; and f) transforming the corrected new NMR data to reconstruct a dynamic image which forms another part of the field of view.
Claim 2
Independent Claim
134 words
A method for producing a series of images with an MRI system, the steps comprising: a) acquiring NMR data comprised of a full set of measurements from which an image having a selected field of view may be reconstructed; b) transforming the acquired NMR data to reconstruct a static image which forms part of the selected field of view; c) producing synthetic raw data from the static image which indicates structures located in the substantially static portion of the field of view; d) acquiring new NMR data using less than a full set of measurements; e) subtracting the synthetic raw data from the new NMR data to produce corrected new NMR data; and f) transforming the corrected new NMR data to reconstruct a dynamic image which forms another part of the field of view.
Claim 3
Dependent Claim
33 words
The method as recited in claim 1 which includes the further step of: g) combining the static image and the dynamic image to produce an updated image of the entire field of view.
Claim 4
Dependent Claim
28 words
The method as recited in claim 2 in which steps a) through g) are repeated in a series of scans to produce a corresponding series of updated images.
Claim 5
Dependent Claim
56 words
The method as recited in claim 3 in which the new NMR data acquired in step d) is substantially one-half the full set of measurements and the new NMR data alternates between a first one-half of the full set of measurements and a second one-half of the full set of measurements during said series of scans.
Claim 6
Dependent Claim
33 words
The method as recited in claim 4 in which the transformation in step b) is a Fourier transformation and each measurement in the full set of measurements is a separate phase encoding view.
Claim 7
Dependent Claim
42 words
The method as recited in claim 5 in which the first one-half of the full set of measurements is the odd numbered phase encoding views and the second one-half of the full set of measurements is the even numbered phase encoding views.
Claim 8
Dependent Claim
24 words
The method as recited in claim 3 in which steps b) and c) are periodically repeated using new NMR data acquired in step d).
Claim 9
Dependent Claim
41 words
The method as recited in claim 1 in which step b) includes Fourier transforming the acquired NMR data in two dimensions to produce an image of the entire field of view and setting to zero the dynamic portion of the image.
Claim 10
Dependent Claim
21 words
The method as recited in claim 8 in which step c) includes inverse Fourier transforming the static image along one dimension.
Claim 11
Dependent Claim
33 words
The method as recited in claim 9 in which the new NMR data acquired in step d) is Fourier transformed along one dimension before the synthetic raw data is subtracted in step e).
Claim 12
Dependent Claim
38 words
The method as recited in claim 1 in which the data acquired in steps a) and d) are shifted in phase to translate the dynamic portion of the image into the center of a shifted field of view.
References Cited (Backward Citations)
US4739766A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2000-12-15 | 2001-06-16 | 2001-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2004-12-15 | 2005-06-16 | 2005-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2008-12-15 | 2009-06-16 | 2009-12-16 | $7700.00 | Window Closed / Lapsed |