US4567893A
Expired / Lapsed
US
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Method of eliminating breathing artifacts in NMR imaging
Assignee: General Electric Co
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Filing: 1984-11-21
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Granted: 1986-02-04
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Expires: 2004-11-21
Abstract
Abstract A method for eliminating or reducing breathing artifacts due to motion-induced phase errors in the phase-encoding dimension when using Fourier transform imaging methods, such as spin warp, utilizes a repetition time (TR) which is an odd multiple of one quarter of the breathing cycle. In the preferred embodiment, the breathing cycle is determined by monitoring the integrated spin-echo signal magnitude spectrum as a function of time.
Inventors
- 👤 Hal C. Charles
- 👤 Gary H. Glover
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:20
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/44; G01R33/48; G01R33/54; G01R33/56; G01R33/567; G01R33/5676; A; A61; A61B; A61B5/00; A61B5/08; A61B5/0816; A61B5/72; A61B5/7203; A61B5/7207; A61B5/7235; A61B5/7253; A61B5/7257; A61B5/7242
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
59 words
A method of reducing artifacts in NMR images due to motion-induced phase errors in the phase-encoding dimension when using Fourier transform imaging pulse sequences, said method comprising: determining the respiration cycle of the subject to be scanned; and selecting a pulse sequence repetition time, TR, to be approximately an odd multiple of one quarter of the breathing cycle, BC.
Claim 2
Independent Claim
59 words
A method of reducing artifacts in NMR images due to motion-induced phase errors in the phase-encoding dimension when using Fourier transform imaging pulse sequences, said method comprising: determining the respiration cycle of the subject to be scanned; and selecting a pulse sequence repetition time, TR, to be approximately an odd multiple of one quarter of the breathing cycle, BC.
Claim 3
Dependent Claim
14 words
The method of claim 1, wherein repetition time TR is selected to be BC/4.
Claim 4
Dependent Claim
14 words
The method of claim 1 wherein repetition time TR is selected to be 3BC/4.
Claim 5
Dependent Claim
26 words
The method of claim 1 wherein the subject comprises an animal and wherein repetition time TR is selected to be greater than or equal to 5BC/4.
Claim 6
Dependent Claim
18 words
The method of claim 1 wherein the Fourier transform imaging pulse sequence comprises a spin-warp imaging pulse sequence.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-02-03 | 1989-08-05 | 1990-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-02-03 | 1993-08-05 | 1994-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-02-03 | 1997-08-05 | 1998-02-04 | $7700.00 | Window Closed / Lapsed |