X-ray or gamma ray systems or devices – Electronic circuit – With display or signaling
Patent
1997-10-06
1999-12-21
Porta, David P.
X-ray or gamma ray systems or devices
Electronic circuit
With display or signaling
382130, H05G 164, A61B 600
Patent
active
060059176
ABSTRACT:
A method of imaging a blood vessel in a body using X-rays and an injectable contrast medium is described. The contrast medium is injected into the body, and signals constituted by an X-ray image sequence depicting X-ray attenuation values is recorded. The X-ray attenuated values in each spaced-time neighborhood are combined in a way that is dependent on the processed image sequence and separately established for each neighborhood, and separating, from background and vessel signals, flow signals having energy contributions mainly in an area of frequency domain bounded by surfaces corresponding to threshold velocities separately established for each neighborhood, which surfaces are shifted a specified amount along a temporal frequency axis.
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Andersson Mats
Knutsson Hans
Kronander Torbjorn
Bruce David Vernon
Porta David P.
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