Displacement detecting element
First Claim
1. A displacement detecting element for detecting displacement in a leaf of a multi-leaf collimator, the multi-leaf collimator defining a shape contour of a collimated radiation beam, the displacement detecting element comprising:
- a voltage source;
a displacement dependent voltage pick-off; and
a resistive strip connected between said voltage source and said voltage pick-up, said resistive strip having a length which is greater than or equal to a maximum length of displacement of the leaf, wherein one of said pick-off and said strip is connected to the leaf and the other one of said pick-off and said strip is stationary, with both said strip and said pick-off being disposed outside of the collimated radiation beam.
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Accused Products
Abstract
The invention relates to a displacement-detecting element (1) comprising a measuring resistance (2), voltage source (3) and a displacement-dependent voltage pick off (4). The measuring resistance (2) is embodied in the form of a strip. The length of the resistor (6) corresponds to at least the maximal length of displacement (7) of the component to be detected. The invention also relates to a multileaf collimator (23) having such a displacement-detecting element (1). The aim of the invention is to produce a displacement-detecting element (a) for detecting the position of the leaves (22) in a multileaf collimator (23) in a precise and faultless manner. The displacement detecting element (1) is designed for detecting the displacement (7′) of the leaves (22) in a multileaf collimator (23) in the following manner: the measuring resistance (2) or the voltage pick off point (4) are connected in a rigid manner to the leaves (22) in order to detect the displacement and another functioning element (4 or 2) is arranged in a fixed manner. At least one of these functioning elements (2, 4) is disposed in an area (33, 33′, 33″) of the leaves (22), which is not exposed to main radiation (34).
36 Citations
20 Claims
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1. A displacement detecting element for detecting displacement in a leaf of a multi-leaf collimator, the multi-leaf collimator defining a shape contour of a collimated radiation beam, the displacement detecting element comprising:
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a voltage source;
a displacement dependent voltage pick-off; and
a resistive strip connected between said voltage source and said voltage pick-up, said resistive strip having a length which is greater than or equal to a maximum length of displacement of the leaf, wherein one of said pick-off and said strip is connected to the leaf and the other one of said pick-off and said strip is stationary, with both said strip and said pick-off being disposed outside of the collimated radiation beam. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification