US4646023A
Expired / Lapsed
US
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Nuclear magnetic resonance imaging
Assignee: Philips Design Ltd
•
Filing: 1985-06-10
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Granted: 1987-02-24
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Expires: 2005-06-10
Abstract
Abstract An NMR chemical shift imaging method and apparatus wherein a number of experiments are performed with different encoding gradients sufficient to obtain a desired spatial resolution in the image, and each of said number of experiments is repeated for each of a number of different delay times between excitation and the start of data collection sufficient to obtain a desired chemical shift resolution in the image.
Inventors
- 👤 Ian R. Young
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:41
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/44; G01R33/48; G01R33/483; G01R33/485
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
109 words
An NMR chemical shift imaging method wherein: a plurality of experiments are performed each comprising: preferentially exciting nuclear spins in a selected region of a body, applying a magnetic field gradient to include the excited spins, and collecting data representing the resultant encoded spins; and the data collected during all the experiments is processed to recover spatial and chemical shift image information, characterised in that: a number of experiments with different encoding gradients are performed to provide spatial image information; and each of said number of experiments is repeated for each of a number of different delay times between excitation and data collection to provide chemical shift image information.
Claim 2
Dependent Claim
109 words
An NMR chemical shift imaging method wherein: a plurality of experiments are performed each comprising: preferentially exciting nuclear spins in a selected region of a body, applying a magnetic field gradient to include the excited spins, and collecting data representing the resultant encoded spins; and the data collected during all the experiments is processed to recover spatial and chemical shift image information, characterised in that: a number of experiments with different encoding gradients are performed to provide spatial image information; and each of said number of experiments is repeated for each of a number of different delay times between excitation and data collection to provide chemical shift image information.
Claim 3
Dependent Claim
39 words
A method according to claim 1 wherein during each said experiment data collection occurs during application of a magnetic field gradient and for each change in said delay time, the time of application of said gradient is correspondingly changed.
Claim 4
Dependent Claim
36 words
A method according to claim 1 wherein in each said experiment said encoding gradient comprises a phase encoding gradient applied between excitation and data collection, whose value is different for each of said number of experiments.
Claim 5
Dependent Claim
32 words
A method according to claim 1 wherein in each said experiment said encoding gradient comprises a gradient applied during data collection whose direction is different for each of said number of experiments.
Claim 6
Dependent Claim
20 words
A method according to claim 1 wherein said number of different delay times is less than said number of experiments.
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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) | 1990-02-23 | 1990-08-25 | 1991-02-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-02-23 | 1994-08-25 | 1995-02-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-02-23 | 1998-08-25 | 1999-02-24 | $7700.00 | Window Closed / Lapsed |