X-ray or gamma ray systems or devices – Electronic circuit – Exposure timer
Patent
1984-07-13
1986-10-21
Church, Craig E.
X-ray or gamma ray systems or devices
Electronic circuit
Exposure timer
358111, H05G 164
Patent
active
046189769
ABSTRACT:
For angiographic X-ray examinations with an image intensifier-television installation, three image memories are connected to a control generator which in respective clock pulse intervals cyclically places a respective one of the image memories in the write state for the purpose of storage of a current video signal which is averaged over several images. A subtraction device for the subtraction of image data occurring at various times receives the current video signal and the output signal of the one image memory in the write state. Connected to the subtraction device is a maximum detector which recognizes the maximum of the contrast medium flow and in response thereto actuates the control generator to cause the image memory which was last in the write state, and the image memory with the chronologically oldest video signal to be switched to the read state and to produce a difference signal for display on a video display based on the readout from such image memories.
REFERENCES:
patent: 4064530 (1977-12-01), Kaiser et al.
patent: 4204226 (1980-05-01), Mistretta
patent: 4444196 (1984-04-01), Stein
patent: 4514759 (1985-04-01), Amtmann
patent: 4543604 (1985-04-01), Grosse
Electronic Radiography in X-Ray Diagnosis during Surgical Procedures, Haendle et al., Electromedica, (English Edition), No. 2, 1981, pp. 74-79.
Computer Angiography-Intravenous Arteriography, Baert et al., Electromedica, (English Edition), No. 2, 1981, pp. 122-131.
Digital Subtraction Angiography (DSA): Diagnostic Importance and Risk, Seyferth et al., Electromedica, (English Edition), No. 2, 1982, pp. 60-68.
Church Craig E.
Siemens Aktiengesellschaft
Wieland Charles
LandOfFree
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