Beam diaphragm and X-ray imaging apparatus
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United States of America Patent
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Aug 28, 2007
Grant Date -
Apr 20, 2006
app pub date -
Oct 5, 2005
filing date -
Oct 15, 2004
priority date (Note) -
Expired
status (Latency Note)
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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.
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