Block for partially limiting a radiation beam, and a collimator comprising such blocks
First Claim
1. A block for partially limiting a radiation beam emitted by a radiation source in a given reference direction, for limiting a first part of the beam corresponding to a maximum half angle of opening, said block being formed by a limiting block having moving means for allowing said limiting block to move in a parallel direction to a first axis transverse to said reference direction, said limiting block comprising a cylindrical active surface which defines limits for the beam, said limits being a function of the position which said cylindrical active surface occupies along said first axis, said moving means allowing movement of said limiting block such that the orientation of the active surface is not modified and said limits are tangential to the cylindrical active surface for all positions of said limiting block.
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Accused Products
Abstract
The invention provides a block for partially limiting a radiation beam, allowing a first part of this beam to be limited corresponding to a first maximum half angle of opening.
This rectilinearly movable block comprises a cylindrical active surface.
Because of this active surface, said block defines new limits for the beam without modifying the starting orientation of this active surface in dependence on the positions which it may occupy through its rectilinear movement.
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Citations
9 Claims
- 1. A block for partially limiting a radiation beam emitted by a radiation source in a given reference direction, for limiting a first part of the beam corresponding to a maximum half angle of opening, said block being formed by a limiting block having moving means for allowing said limiting block to move in a parallel direction to a first axis transverse to said reference direction, said limiting block comprising a cylindrical active surface which defines limits for the beam, said limits being a function of the position which said cylindrical active surface occupies along said first axis, said moving means allowing movement of said limiting block such that the orientation of the active surface is not modified and said limits are tangential to the cylindrical active surface for all positions of said limiting block.
Specification