EP0082684A2
Expired / Lapsed
EP
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Blood vessel projection imaging system using nuclear magnetic resonance
Assignee: Individual
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Filing: 1982-12-16
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Granted: —
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Expires: 2002-12-16
Abstract
Abstract A two-dimensional projection image of the NMR activity within a volume is obtained. The signals due to static material are cancelled and do not appear in the projection image. The signals due to moving blood in vessels produce an isolated image of the vessels with the superimposed structure removed.
Inventors
- 👤 Albert Macovski
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-07 06:31
CPC Classifications
G; G01; G01R; G01R33/00; G01R33/20; G01R33/44; G01R33/48; G01R33/54; G01R33/56; G01R33/563; G01R33/5635; G01R33/56308; G01R33/445
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
56 words
In a method for imaging moving material in a volume the steps of: addressing the magnetic spins in the volume so that static material will produce no net received signal and moving material will produce a signal; and processing the resultant received signals to form a two-dimensional projection image of the moving material in the volume.
Claim 2
Dependent Claim
56 words
In a method for imaging moving material in a volume the steps of: addressing the magnetic spins in the volume so that static material will produce no net received signal and moving material will produce a signal; and processing the resultant received signals to form a two-dimensional projection image of the moving material in the volume.
Claim 3
Dependent Claim
81 words
The method as described in Claim 1 wherein the step of addressing the magnetic spins include the steps of: exciting the magnetic spins in the volume during a first time interval when the material * is moving at a first velocity; exciting the magnetic spins in the volume during a second time interval when the material is moving at a second velocity different than that of the first velocity; and subtracting the received signals derived from the first and second excitations.
Claim 4
Dependent Claim
48 words
Apparatus for providing a two-dimensional projection image of the moving material in a volume comprising: means for producing received signals which represent a two-dimensional projection image of the magnetic spin activity in the volume; and means for cancelling that portion of the received signals generated by static material.
Claim 5
Dependent Claim
48 words
Apparatus for providing a two-dimensional projection image of the moving material in a volume comprising: means for producing received signals which represent a two-dimensional projection image of the magnetic spin activity in the volume; and means for cancelling that portion of the received signals generated by static material.
Claim 6
Dependent Claim
74 words
Apparatus as recited in Claim 3 wherein the means for cancelling that portion of the signal generated by static materials includes: means for exciting the magnetic spins in a first sub-region of the volume; means for receiving signals from a second sub-region of the volume which is adjacent to that of the first sub-region whereby only excited material which has moved from the first sub-region to the second sub-region will produce a received signal.
Claim 7
Dependent Claim
59 words
Apparatus as recited in Claim 3 wherein the means for cancelling that portion of the signal generated by static materials includes means for exciting the magnetic spins in the volume to the level where magnetic spins in static material are inverted whereby only the moving material which has not completely experienced an inverting excitation will produce a received signal.
References Cited (Backward Citations)
No citation records indexed.
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