X-ray or gamma ray systems or devices – Electronic circuit – Exposure timer
Patent
1990-04-19
1990-12-11
Church, Craig E.
X-ray or gamma ray systems or devices
Electronic circuit
Exposure timer
378 95, H05G 164
Patent
active
049775871
ABSTRACT:
The fluoroscopic signal is supplied to A/D converter and converted into a digital signal. The digital signal is input to selection circuit, memory and display control circuit. Selection circuit detects the brightness of each frame of the fluoroscopic signal and comprises accumulator, reference register, comparator, and AND gate. Accumulator accumulates digital signal of each frame, and detects the brightness of each frame. Register multiplies the brightness of any frame of image formed before the injection of a contrast medium into the blood vessel, with a suitable coefficient, and holds the product as a reference value. Comparator compares the reference value with the output data of accumulator. A trigger signal is externally input to AND gate, and the output of accumulator is supplied to AND gate. When the output of comparator is not less than the reference value, the comparator outputs the detection signal and the write-enable terminal WE of memory rises to a high level. Then, the fluoroscopic signal output by A/D converter is written into memory. When the output of accumulator becomes less than the reference value, the output of comparator falls to a low level, whereby the data writing is stopped and the frames are read from memory. Display control circuit superposes the fluoroscopic signal read from memory, with the fluoroscopic signal output by A/D converter in real time, and displays the superposed signals on display.
REFERENCES:
patent: 4185198 (1980-01-01), Fujimoto
patent: 4204226 (1980-05-01), Mistretta et al.
patent: 4504858 (1985-03-01), Franke
patent: 4543604 (1985-09-01), Grosse
patent: 4551800 (1985-11-01), Riederer et al.
patent: 4618976 (1986-10-01), Haendle
patent: 4689670 (1987-08-01), Okazaki
patent: 4709385 (1987-11-01), Pfeiler et al.
Church Craig E.
Kabushiki Kaisha Toshiba
LandOfFree
X-ray image processing apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with X-ray image processing apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and X-ray image processing apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-394159