Patent US5078141A successfully refreshed from Google Patents.
US5078141A
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Method and system for acquiring image representing brain surface anatomy
Assignee: Toshiba Corp
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Filing: 1991-05-03
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Granted: 1992-01-07
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Expires: 2011-05-03
Abstract
Abstract In an MRI system, in order to acquire an MR image representing a brain surface anatomy of a head of a subject, a surface coil is disposed near the head of the subject, and a predetermined pulse sequence by a spin echo method, a field echo method, or the like is performed. A view direction is changed for a single slice, and an MR image based on stereoscopic viewing is obtained by a single scan. Regions of interest are set on the brain surface portion on the MR image, and then a predetermined pulse sequence is using an echo time for inhibiting mr signals from fat of the brain surface and using a pulse repetition time for enhancing mr signals from water of the brain surface in order performed to obtain projection data in a direction of depth, thereby allowing accurate grasping of the position of a disease portion.
Inventors
- 👤 Hirokazu Suzuki
- 👤 Yoshio Machida
- 👤 Masahiko Hatanaka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:10
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/44; G01R33/48; G01R33/483; G01R33/4833; G01R33/485; H; H04; H04N; H04N13/00; H04N13/30; G01R33/54; G01R33/56; H04N13/20; H04N13/204; H04N13/254
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
142 words
A method for acquiring an image representing a brain surface anatomy of a subject in a magnetic resonance imaging apparatus, the method comprising the steps of: arranging a surface coil near the head of the subject; executing a predetermined pulse sequence for applying a static magnetic field, gradient magnetic fields, and a radio frequency pulse to the subject to obtain magnetic resonance signals from water of only a brain surface inside the head of the subject and to inhibit magnetic resonance signals from fat of the brain surface inside the head of the subject; detecting the magnetic resonance signals from the water of only the brain surface inside the head of the subject using the surface coil in accordance with the predetermined pulse sequence; and constructing an image representing the brain surface anatomy of the subject from the detected magnetic resonance signals.
Claim 2
Independent Claim
142 words
A method for acquiring an image representing a brain surface anatomy of a subject in a magnetic resonance imaging apparatus, the method comprising the steps of: arranging a surface coil near the head of the subject; executing a predetermined pulse sequence for applying a static magnetic field, gradient magnetic fields, and a radio frequency pulse to the subject to obtain magnetic resonance signals from water of only a brain surface inside the head of the subject and to inhibit magnetic resonance signals from fat of the brain surface inside the head of the subject; detecting the magnetic resonance signals from the water of only the brain surface inside the head of the subject using the surface coil in accordance with the predetermined pulse sequence; and constructing an image representing the brain surface anatomy of the subject from the detected magnetic resonance signals.
Claim 3
Dependent Claim
21 words
The method according to claim 1, wherein the predetermined pulse sequence includes a pulse sequence corresponding to a field echo method.
Claim 4
Dependent Claim
25 words
The method according to claim 1, wherein the predetermined pulse sequence includes a pulse sequence corresponding to a field echo method using a chemical shift.
Claim 5
Dependent Claim
66 words
The method according to claim 1, wherein the predetermined pulse sequence includes the steps of: applying an α(α<90°) pulse to the head of the subject; applying a first 180° pulse to the head of the subject; applying a second 180° pulse to the head of the subject; and detecting the magnetic resonance signals from the water of the brain surface inside the head of the subject.
Claim 6
Dependent Claim
45 words
The method according to claim 1, further comprising the steps of: setting a region of interest on the constructed images; obtaining projection data by executing another predetermined pulse sequence for the set region of interest; and displaying the constructed images and the obtained projection data.
Claim 7
Dependent Claim
36 words
The method according to claim 1, wherein the predetermined pulse sequence is executed using an echo time for inhibiting the magnetic resonance signals from the fat of the brain surface inside the head of the subject.
Claim 8
Dependent Claim
14 words
The method according to claim 6, wherein the echo time is approximately 250 msec.
Claim 9
Dependent Claim
38 words
The method according to claim 1, wherein the predetermined pulse sequence is executed using a pulse repetition time for enhancing the magnetic resonance signals from the water of only the brain surface inside the head of the subject.
Claim 10
Dependent Claim
15 words
The method according to claim 8, wherein the pulse repetition time is approximately 2000 msec.
Claim 11
Independent Claim
182 words
A method for acquiring an image representing a brain surface anatomy inside the head of a subject in a magnetic resonance imaging apparatus, the method comprising the steps of: arranging a surface coil near the head of the subject; executing a predetermined pulse sequence for applying a static magnetic field, gradient magnetic fields, and a radio frequency pulse to the subject to obtain magnetic resonance signals from water of only a brain surface inside the head of the subject and to inhibit magnetic resonance signals from fat of the brain surface inside the head of the subject; setting view directions for a slice position of the head of the subject by controlling components of the gradient magnetic fields; detecting said magnetic resonance signals corresponding to the set view directions from the water of only the brain surface inside the head of the subject using the surface coil in accordance with the predetermined pulse sequence; and constructing images representing the brain surface anatomy of the subject from the detected magnetic resonance signals to acquire a stereoscopic image in accordance with the constructed images.
Claim 12
Independent Claim
182 words
A method for acquiring an image representing a brain surface anatomy inside the head of a subject in a magnetic resonance imaging apparatus, the method comprising the steps of: arranging a surface coil near the head of the subject; executing a predetermined pulse sequence for applying a static magnetic field, gradient magnetic fields, and a radio frequency pulse to the subject to obtain magnetic resonance signals from water of only a brain surface inside the head of the subject and to inhibit magnetic resonance signals from fat of the brain surface inside the head of the subject; setting view directions for a slice position of the head of the subject by controlling components of the gradient magnetic fields; detecting said magnetic resonance signals corresponding to the set view directions from the water of only the brain surface inside the head of the subject using the surface coil in accordance with the predetermined pulse sequence; and constructing images representing the brain surface anatomy of the subject from the detected magnetic resonance signals to acquire a stereoscopic image in accordance with the constructed images.
Claim 13
Independent Claim
177 words
A system for acquiring an image representing a brain surface anatomy inside a head of a subject in a magnetic resonance imaging apparatus, the system comprising: static magnetic field applying means for applying a static magnetic field to the subject; gradient magnetic field applying means for applying gradient magnetic fields to the subject; surface coil means for transmitting a radio frequency pulse to the subject and detecting magnetic resonance signals from the subject, the surface coil means being arranged near the head of the subject; pulse sequence control means for controlling the static magnetic field applying means, the gradient magnetic field applying means and the surface coil means in accordance with a predetermined pulse sequence to obtain the magnetic resonance signals from water of only a brain surface inside the head of the subject and to inhibit the magnetic resonance signals from fat of the brain surface inside the head of the subject; and processing means for processing the magnetic resonance signals detected by the surface coil means to produce an image representing the brain surface anatomy.
Claim 14
Independent Claim
177 words
A system for acquiring an image representing a brain surface anatomy inside a head of a subject in a magnetic resonance imaging apparatus, the system comprising: static magnetic field applying means for applying a static magnetic field to the subject; gradient magnetic field applying means for applying gradient magnetic fields to the subject; surface coil means for transmitting a radio frequency pulse to the subject and detecting magnetic resonance signals from the subject, the surface coil means being arranged near the head of the subject; pulse sequence control means for controlling the static magnetic field applying means, the gradient magnetic field applying means and the surface coil means in accordance with a predetermined pulse sequence to obtain the magnetic resonance signals from water of only a brain surface inside the head of the subject and to inhibit the magnetic resonance signals from fat of the brain surface inside the head of the subject; and processing means for processing the magnetic resonance signals detected by the surface coil means to produce an image representing the brain surface anatomy.
Claim 15
Dependent Claim
21 words
The system according to claim 11, wherein the predetermined pulse sequence includes a pulse sequence corresponding to a field echo method.
Claim 16
Dependent Claim
25 words
The system according to claim 11, wherein the predetermined pulse sequence includes a pulse sequence corresponding to a field echo method using a chemical shift.
Claim 17
Independent Claim
211 words
A system for acquiring an image representing a brain surface anatomy inside a head of a subject in a magnetic resonance imaging apparatus, the system comprising: static magnetic field applying means for applying a static magnetic field to the subject; gradient magnetic field applying means for applying gradient magnetic fields to the subject; surface coil means for transmitting a radio frequency pulse to the subject and detecting magnetic resonance signals from the subject, the surface coil means being arranged near the head of the subject; setting means for setting view directions for a slice position of the head; pulse sequence control means for controlling the static magnetic field applying means, the gradient magnetic field applying means and the surface coil means to obtain the magnetic resonance signals from water of only a brain surface inside the head of the subject and to inhibit the magnetic resonance signals from fat of the brain surface inside the head of the subject, corresponding to each of said set view directions; and processing means for processing the magnetic resonance signals detected by the surface coil means to produce a stereoscopic image representing the brain surface anatomy, wherein the view directions set by the setting means are set by controlling components of the gradient magnetic fields.
Claim 18
Independent Claim
211 words
A system for acquiring an image representing a brain surface anatomy inside a head of a subject in a magnetic resonance imaging apparatus, the system comprising: static magnetic field applying means for applying a static magnetic field to the subject; gradient magnetic field applying means for applying gradient magnetic fields to the subject; surface coil means for transmitting a radio frequency pulse to the subject and detecting magnetic resonance signals from the subject, the surface coil means being arranged near the head of the subject; setting means for setting view directions for a slice position of the head; pulse sequence control means for controlling the static magnetic field applying means, the gradient magnetic field applying means and the surface coil means to obtain the magnetic resonance signals from water of only a brain surface inside the head of the subject and to inhibit the magnetic resonance signals from fat of the brain surface inside the head of the subject, corresponding to each of said set view directions; and processing means for processing the magnetic resonance signals detected by the surface coil means to produce a stereoscopic image representing the brain surface anatomy, wherein the view directions set by the setting means are set by controlling components of the gradient magnetic fields.
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) | 1995-01-06 | 1995-07-08 | 1996-01-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-01-06 | 1999-07-08 | 2000-01-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-01-06 | 2003-07-08 | 2004-01-07 | $7700.00 | Window Closed / Lapsed |