Proximity sensor for gamma camera

Details Proximity sensor for gamma camera Proximity sensor for gamma camera

1992-11-27

1994-06-07

Hannaher, Constantine

Radiant energy

Invisible radiant energy responsive electric signalling

With or including a luminophor

25036302, G01T 120

Patent

active

053192052

ABSTRACT:
An imaging detector on a medical imager is provided with a proximity sensor for automatically maintaining a desired distance from the subject to be imaged. The proximity sensor is formed from three infrared beams at decreasing distances from the imaging detector. The imaging detector is moved toward the subject until the first two beams are interrupted. If the third beam is interrupted, the imaging detector is moved back from the subject until only the first beam is interrupted. Faults are detected by monitoring the order in which the beams are interrupted, whether the beams are interrupted when the imaging detector is fully retracted, and whether beams are present when no signal is applied to the beam emitters.

REFERENCES:
patent: 4445035 (1984-04-01), Ueyama
patent: 4593189 (1986-06-01), Stoub
patent: 5055687 (1991-10-01), Ichihara

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