US5222500A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic resonance imaging method and apparatus for the same
Assignee: Toshiba Corp
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Filing: 1991-06-21
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Granted: 1993-06-29
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Expires: 2011-06-21
Abstract
Abstract A magnetic resonance imaging apparatus disclosed by this invention has a magnet assembly including a static magnetic field coil, a gradient magnetic field coil, an excitation coil, and a detection coil. A magnetic resonance signal detected by the detection coil is subjected to image reconstructing processing to obtain an image. The excitation coil can generate an exciting radio frequency pulse magnetic field for causing magnetic resonance excitation of a plurality of regions of an object to be examined simultaneously. Such an exciting radio frequency pulse magnetic field is formed by a mixed carrier having a plurality of carriers of different center frequencies.
Inventors
- 👤 Hiroshi Sugimoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 19:19
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/44; G01R33/48; G01R33/483; G01R33/4833; G01R33/4835
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
105 words
A magnetic resonance imaging method comprising: a first step of causing magnetic resonance excitation of first and second regions which intersect with a blood vessel of an object to be examined simultaneously, the second region being separated from the first region by a predetermined distance and not intersecting with the first region; a second step of acquiring a magnetic resonance signal from only the second region, the second step being executed after the first step; and a third step of performing image reconstruction processing of the magnetic resonance signal acquired in the second step in order to obtain a tomographic image of the second region.
Claim 2
Dependent Claim
105 words
A magnetic resonance imaging method comprising: a first step of causing magnetic resonance excitation of first and second regions which intersect with a blood vessel of an object to be examined simultaneously, the second region being separated from the first region by a predetermined distance and not intersecting with the first region; a second step of acquiring a magnetic resonance signal from only the second region, the second step being executed after the first step; and a third step of performing image reconstruction processing of the magnetic resonance signal acquired in the second step in order to obtain a tomographic image of the second region.
Claim 3
Dependent Claim
35 words
A method according to claim 1, wherein the first step comprises using a mixed carrier obtained by mixing a first carrier corresponding to the first region and a second carrier corresponding to the second region.
Claim 4
Dependent Claim
28 words
A method according to claim 2, wherein the mixed carrier is modulated with a SINC function waveform in order to generate an exciting radio frequency pulse magnetic field.
Claim 5
Dependent Claim
41 words
A method according to claim 1, wherein the second step includes a step of applying a slicing gradient magnetic field for separating a magnetic resonance signal induced from the first region and a magnetic resonance signal induced from the second region.
Claim 6
Dependent Claim
22 words
A method according to claim 1, wherein the magnetic resonance signal from the second region is a spin echo magnetic resonance signal.
Claim 7
Dependent Claim
22 words
A method according to claim 1, wherein the magnetic resonance signal from the second region is a field echo magnetic resonance signal.
Claim 8
Dependent Claim
17 words
A method according to claim 1, wherein the second region is an inversion recovery magnetic resonance signal.
Claim 9
Dependent Claim
17 words
A method according to claim 1, wherein the second region is an echo planar magnetic resonance signal.
Claim 10
Dependent Claim
34 words
A method according to claim 1, wherein the first, second, and third steps are executed while sequentially changing an order of the first and second regions in order to obtain a plurality of images.
Claim 11
Dependent Claim
106 words
A magnetic resonance imaging method comprising: a first step of causing magnetic resonance excitation of first and second regions of an object to be examined simultaneously, the second region including a blood vessel, wherein said second region intersects with the first region; a second step of acquiring a magnetic resonance signal from the second region and a part of the first region intersecting with the second region, the second step being executed after the first step; and a third step of performing image reconstruction processing of the magnetic resonance signal acquired in the second step in order to obtain a tomographic image of the second region.
Claim 12
Dependent Claim
106 words
A magnetic resonance imaging method comprising: a first step of causing magnetic resonance excitation of first and second regions of an object to be examined simultaneously, the second region including a blood vessel, wherein said second region intersects with the first region; a second step of acquiring a magnetic resonance signal from the second region and a part of the first region intersecting with the second region, the second step being executed after the first step; and a third step of performing image reconstruction processing of the magnetic resonance signal acquired in the second step in order to obtain a tomographic image of the second region.
Claim 13
Dependent Claim
45 words
A method according to claim 10, wherein the first step comprises using a carrier to be modulated including a first carrier corresponding to the first region at a first half thereof and a second carrier corresponding to the second region at a second half thereof.
Claim 14
Dependent Claim
30 words
A method according to claim 11, wherein the carrier to be modulated is modulated with a SINC function waveform in order to generate an exciting radio frequency pulse magnetic field.
Claim 15
Dependent Claim
129 words
A magnetic resonance imaging method comprising: a first step of causing magnetic resonance excitation of at least first and second regions of first, second and third regions of an object to be examined simultaneously, the second region intersecting with a blood vessel, separated from the first region by a predetermined distance and not intersecting with the first region, the third region being separated from the second region and intersecting with neither the first nor second regions; a second step of acquiring a magnetic resonance signal from only the second region, the second step being executed after the first step; and a third step of performing image reconstruction processing of the magnetic resonance signal acquired in the second step in order to obtain a tomographic image of the second region.
Claim 16
Dependent Claim
129 words
A magnetic resonance imaging method comprising: a first step of causing magnetic resonance excitation of at least first and second regions of first, second and third regions of an object to be examined simultaneously, the second region intersecting with a blood vessel, separated from the first region by a predetermined distance and not intersecting with the first region, the third region being separated from the second region and intersecting with neither the first nor second regions; a second step of acquiring a magnetic resonance signal from only the second region, the second step being executed after the first step; and a third step of performing image reconstruction processing of the magnetic resonance signal acquired in the second step in order to obtain a tomographic image of the second region.
Claim 17
Dependent Claim
38 words
A method according to claim 12, wherein the first step comprises using a mixed carrier as a mixture of at least a first carrier corresponding to the first region and a third carrier corresponding to the third region.
Claim 18
Dependent Claim
28 words
A method according to claim 14, wherein the mixed carrier is modulated by a SINC function waveform in order to generate an exciting radio frequency pulse magnetic field.
Claim 19
Dependent Claim
43 words
A method according to claim 13, wherein the second step includes a step of applying a slicing gradient magnetic field in order to separate a magnetic resonance signal induced from the first region and the magnetic resonance signal induced from the second region.
Claim 20
Dependent Claim
22 words
A method according to claim 13, wherein said magnetic resonance signal from the second region is a spin echo magnetic resonance signal.
Claim 21
Dependent Claim
22 words
A method according to claim 13, wherein said magnetic resonance signal from the second region is a field echo magnetic resonance signal.
Claim 22
Dependent Claim
22 words
A method according to claim 13, wherein said magnetic resonance signal from the second region is an inversion recovery magnetic resonance signal.
Claim 23
Dependent Claim
22 words
A method according to claim 15, wherein said magnetic resonance signal from the second region is an echo planar magnetic resonance signal.
Claim 24
Dependent Claim
34 words
A method according to claim 13, wherein the first, second, and third steps are executed while sequentially changing an order of the first and second regions in order to obtain a plurality of images.
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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) | 1996-06-28 | 1996-12-28 | 1997-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-28 | 2000-12-28 | 2001-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-28 | 2004-12-28 | 2005-06-29 | $7700.00 | Window Closed / Lapsed |