Patent US5199435A successfully refreshed from Google Patents.
US5199435A
Expired / Lapsed
US
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Magnetic resonance imaging system
Assignee: Toshiba Corp
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Filing: 1990-06-11
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Granted: 1993-04-06
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Expires: 2010-06-11
Abstract
Abstract A magnetic resonance imaging system selectively excites a plurality of predetermined first regions of an object to cause an magnetic resonance, selectively excites at least one predetermined second region intersecting the first regions to cause an magnetic resonance before the magnetic resonance is relaxed, collects a magnetic resonance signal, and acquires a magnetic resonance image of the second region based on the magnetic resonance signal.
Inventors
- 👤 Hiroshi Sugimoto
- 👤 Hirokazu Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 19:09
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/44; G01R33/48; G01R33/483; G01R33/4833; G01R33/54; G01R33/56; G01R33/563; G01R33/56308
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
136 words
A magnetic resonance imaging system for diagnosing right and left kidneys of a subject, comprising: means for selectively exciting and saturating a first and a second sagittal slice, said first sagittal slice including said right kidney where blood flows in renal veins and said second sagittal slice including said left kidney where blood flows in renal veins; and means for imaging including means for selectively exciting a coronal slice which includes the right and left kidneys where blood flows in renal veins said coronal slice intersecting said first and second sagittal slices to cause a magnetic resonance before said magnetic resonance caused by said selective exciting and saturating means is relaxed, means for collecting a magnetic resonance signal, and means for acquiring a magnetic resonance image of said coronal slice based on said magnetic resonance signal.
Claim 2
Dependent Claim
136 words
A magnetic resonance imaging system for diagnosing right and left kidneys of a subject, comprising: means for selectively exciting and saturating a first and a second sagittal slice, said first sagittal slice including said right kidney where blood flows in renal veins and said second sagittal slice including said left kidney where blood flows in renal veins; and means for imaging including means for selectively exciting a coronal slice which includes the right and left kidneys where blood flows in renal veins said coronal slice intersecting said first and second sagittal slices to cause a magnetic resonance before said magnetic resonance caused by said selective exciting and saturating means is relaxed, means for collecting a magnetic resonance signal, and means for acquiring a magnetic resonance image of said coronal slice based on said magnetic resonance signal.
Claim 3
Dependent Claim
40 words
A system according to claim 1, wherein said selective exciting and saturating means includes means for applying a pre-pulse consisting of a high-frequency selective excitation pulse including carriers of two different frequencies and a gradient field pulse to said object.
Claim 4
Dependent Claim
51 words
A system according to claim 1, wherein said selective exciting and saturating means includes means for applying a combination of a pre-pulse consisting of a high-frequency selective excitation pulse and a gradient field pulse to said object for two times and means for sequentially changing a carrier frequency of said pre-pulse.
Claim 5
Dependent Claim
53 words
A system according to claim 1, wherein said means for selectively exciting and saturating includes means for applying a combination of a pre-pulse consisting of a high-frequency selective excitation pulse and a gradient field pulse to said object for a plurality of times while sequentially changing an amplitude to said gradient field pulse.
Claim 6
Dependent Claim
62 words
A system according to claim 1, wherein said means for selectively exciting and saturating includes means for applying a combination of pre-pulse consisting of a high-frequency selective excitation pulse and a gradient field pulse to said object for a plurality of times while sequentially changing a combination of a carrier frequency of said pre-pulse and an amplitude of said gradient field pulse.
Claim 7
Dependent Claim
65 words
A system according to claim 1, wherein said means for selectively exciting and saturating including means for applying a combination of a pre-pulse consisting of a high-frequency selective excitation pulse and a gradient field pulse to said object for a plurality of times while sequentially changing at least one of a carrier frequency of said pre-pulse and a gradient direction of said gradient field pulse.
Claim 8
Dependent Claim
21 words
A system according to claim 1, wherein said collecting means includes means for collecting a pulse spin echo magnetic resonance signal.
Claim 9
Dependent Claim
21 words
A system according to claim 1, wherein said collecting means includes means for collecting a gradient field echo magnetic resonance signal.
Claim 10
Dependent Claim
28 words
A system according to claim 1, wherein said acquiring means includes means for Fourier transforming said magnetic resonance signal to said magnetic resonance image of said coronal slice.
Claim 11
Dependent Claim
120 words
A magnetic resonance imaging method for diagnosing right and left kidneys of a subject, comprising: selectively exciting and saturating a first and a second sagittal slice, said first sagittal slice including said right kidney where blood flows in renal veins and said second sagittal slice including said left kidney where blood flows in renal veins; selectively exciting a coronal slice which includes the first and second kidneys where blood flows in renal veins intersecting said first and second sagittal slices to cause a magnetic resonance before said magnetic resonance occurring in said selective exciting and saturating step is relaxed; collecting a magnetic resonance signal; and acquiring a magnetic resonance image of said coronal slice based on said magnetic resonance signal.
Claim 12
Dependent Claim
120 words
A magnetic resonance imaging method for diagnosing right and left kidneys of a subject, comprising: selectively exciting and saturating a first and a second sagittal slice, said first sagittal slice including said right kidney where blood flows in renal veins and said second sagittal slice including said left kidney where blood flows in renal veins; selectively exciting a coronal slice which includes the first and second kidneys where blood flows in renal veins intersecting said first and second sagittal slices to cause a magnetic resonance before said magnetic resonance occurring in said selective exciting and saturating step is relaxed; collecting a magnetic resonance signal; and acquiring a magnetic resonance image of said coronal slice based on said magnetic resonance signal.
Claim 13
Dependent Claim
38 words
A method according to claim 10, wherein said selective exciting and saturating step includes applying a pre-pulse consisting of a high-frequency selective excitation pulse including carriers of two different frequencies and a gradient field pulse to said object.
Claim 14
Dependent Claim
44 words
A method according to claim 10, wherein said selective exciting and saturating step includes applying a combination of a pre-pulse consisting of a high-frequency selective excitation pulse and a gradient field pulse to said object while sequentially changing a carrier frequency of said pre-pulse.
Claim 15
Dependent Claim
53 words
A method according to claim 10, wherein said selectively exciting and saturating step includes a step for applying a combination of a pre-pulse consisting of a high-frequency selective excitation pulse and a gradient field pulse to said object for a plurality of times while sequentially changing a amplitude of said gradient field pulse.
Claim 16
Dependent Claim
63 words
A method according to claim 10, wherein said selectively exciting and saturating step includes a step for applying a combination of a pre-pulse consisting of a high-frequency selective excitation pulse and a gradient field pulse to said object for a plurality of times while sequentially changing a combination of a carrier frequency of said pre-pulse and an amplitude of said gradient field pulse.
Claim 17
Dependent Claim
65 words
A method according to claim 10, wherein said selectively exciting and saturating step includes a step for applying a combination of a pre-pulse consisting of a high-frequency selective excitation pulse and a gradient field pulse to said object for a plurality of times while sequentially changing at least one of a carrier frequency of said pre-pulse and a gradient direction of said gradient field pulse.
Claim 18
Dependent Claim
18 words
A method according to claim 10, wherein said collecting step collects a pulse spin echo magnetic resonance signal.
Claim 19
Dependent Claim
18 words
A method according to claim 10, wherein said collecting step collects a gradient field echo magnetic resonance signal.
Claim 20
Dependent Claim
26 words
A method according to claim 10, wherein said acquiring step includes Fourier transforming said magnetic resonance signal into said magnetic resonance image of said coronal slice.
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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) | 1996-04-05 | 1996-10-05 | 1997-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-04-05 | 2000-10-05 | 2001-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-04-05 | 2004-10-05 | 2005-04-06 | $7700.00 | Window Closed / Lapsed |