Beam diaphragm and X-ray imaging apparatus

Details Beam diaphragm and X-ray imaging apparatus Beam diaphragm and X-ray imaging apparatus

2007-08-28

2007-08-28

Ho, Allen C. (Department: 2882)

X-ray or gamma ray systems or devices

Beam control

Shutter or chopper

C378S147000, C378S150000, C378S151000, C250S505100

Reexamination Certificate

active

11243696

ABSTRACT:
With a view to providing a beam diaphragm having a large maximum value of aperture opening under a limited profile dimension, the beam diaphragm comprises a pair of control rings having coaxial apertures for the passage of X-rays therethrough and being opposed to each other axially through a spacing and coaxially rotatable independently of each other, a blade positioned between the pair of control rings, and position adjusting means which, in accordance with a relative rotation of the pair of control rings, causes the blade to move toward or away from a common axis of the apertures so as to describe a sectorial plane whose radius increases or decreases continuously.

REFERENCES:
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patent: 5689544 (1997-11-01), Van Den Besselaar
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patent: 5991362 (1999-11-01), Jones
patent: 6233303 (2001-05-01), Tam
patent: 6778636 (2004-08-01), Andrews

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