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Patent US5352980A successfully refreshed from Google Patents.
US5352980A
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Magnetic resonance imaging apparatus
Assignee: Toshiba Corp
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Filing: 1993-02-25
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Granted: 1994-10-04
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Expires: 2013-02-25
Abstract
Abstract The MR imaging apparatus for imaging a moving spin, comprises a design unit for designing four sets of pulse sequences with four moment vectors, especially four first moment vectors, which can impart a phase shift to the moving spins, an acquiring unit for acquiring echo data by implementing the designed pulse sequences, a calculating unit for calculating a flow-related value of the moving spin, especially, a flow velocity using the echo data and a generating unit for generating image data of the moving spin using the calculated flow velocity. The first moment vectors correspond to four vertices of a tetrahedron respectively located in a 3-D moment space, a center of which coincides with an origin of the 3-D moment space.
Inventors
- 👤 Yoshio Machida
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 00:29
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/44; G01R33/48; G01R33/54; G01R33/56; G01R33/563; G01R33/56308; G01R33/56316
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
97 words
A magnetic resonance imaging apparatus for imaging a moving spin in an object being examined, comprising: means for predetermining sets of pulse sequences corresponding to predetermined moment vectors respectively which impart a phase shift to the moving spin; means for acquiring echo data by implementing said pulse sequences; means for calculating a flow-related value of the moving spin using the echo data; and means for generating image data of the moving spin using the flow-related value, wherein the moment vectors correspond to four vertices and a center of a tetrahedron respectively located in a three-dimensional moment space.
Claim 2
Dependent Claim
97 words
A magnetic resonance imaging apparatus for imaging a moving spin in an object being examined, comprising: means for predetermining sets of pulse sequences corresponding to predetermined moment vectors respectively which impart a phase shift to the moving spin; means for acquiring echo data by implementing said pulse sequences; means for calculating a flow-related value of the moving spin using the echo data; and means for generating image data of the moving spin using the flow-related value, wherein the moment vectors correspond to four vertices and a center of a tetrahedron respectively located in a three-dimensional moment space.
Claim 3
Dependent Claim
25 words
A magnetic resonance imaging apparatus according to claim 1, wherein the center of the tetrahedron is placed at an origin of the three-dimensional moment space.
Claim 4
Dependent Claim
25 words
A magnetic resonance imaging apparatus according to claim 2, wherein the moment vectors are first-order moment vectors and the flow-related value is a flow velocity.
Claim 5
Dependent Claim
28 words
A magnetic resonance imaging apparatus according to claim 2, wherein the moment vectors are second-order moment vectors and the flow-related value is an acceleration of the moving spin.
Claim 6
Dependent Claim
28 words
A magnetic resonance imaging apparatus according to claim 1, wherein the center of the tetrahedron is placed at a position other than an origin of the three-dimensional space.
Claim 7
Dependent Claim
18 words
A magnetic resonance imaging apparatus according to claim 1, wherein the tetrahedron is formed into a regular tetrahedron.
Claim 8
Dependent Claim
18 words
A magnetic resonance imaging apparatus according to claim 1, wherein the tetrahedron is formed into a non-regular tetrahedron.
Claim 9
Dependent Claim
97 words
A magnetic resonance imaging apparatus for imaging a moving spin in an object being examined, comprising: means for predetermining sets of pulse sequences corresponding to predetermined moment vectors respectively which impart a phase shift to the moving spin; means for acquiring echo data by implementing said pulse sequences; means for calculating a flow-related value of the moving spin using the echo data; and means for generating image data of the moving spin using the flow-related value, wherein the moment vectors correspond to three vertices and a center of a triangle respectively located in a two-dimensional moment space.
Claim 10
Dependent Claim
97 words
A magnetic resonance imaging apparatus for imaging a moving spin in an object being examined, comprising: means for predetermining sets of pulse sequences corresponding to predetermined moment vectors respectively which impart a phase shift to the moving spin; means for acquiring echo data by implementing said pulse sequences; means for calculating a flow-related value of the moving spin using the echo data; and means for generating image data of the moving spin using the flow-related value, wherein the moment vectors correspond to three vertices and a center of a triangle respectively located in a two-dimensional moment space.
Claim 11
Dependent Claim
25 words
A magnetic resonance imaging apparatus according to claim 8, wherein the center of the triangle is placed at an origin of the two-dimensional moment space.
Claim 12
Dependent Claim
25 words
A magnetic resonance imaging apparatus according to claim 9, wherein the moment vectors are first-order moment vectors and the flow-related value is a flow velocity.
Claim 13
Dependent Claim
28 words
A magnetic resonance imaging apparatus according to claim 9, wherein the moment vectors are second-order moment vectors and the flow-related value is an acceleration of the moving spin.
Claim 14
Dependent Claim
28 words
A magnetic resonance imaging apparatus according to claim 8, wherein the center of the triangle is placed at a position other than an origin of the two-dimensional space.
Claim 15
Dependent Claim
18 words
A magnetic resonance imaging apparatus according to claim 8, wherein the triangle is formed into a regular triangle.
Claim 16
Dependent Claim
18 words
A magnetic resonance imaging apparatus according to claim 8, wherein the triangle is formed into a non-regular triangle.
References Cited (Backward Citations)
US5038783A
Cited
US5221898A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1997-10-03 | 1998-04-04 | 1998-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2001-10-03 | 2002-04-04 | 2002-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2005-10-03 | 2006-04-04 | 2006-10-04 | $7700.00 | Window Closed / Lapsed |