POSITION SENSORING METHOD AND SYSTEM FOR A MULTI-LEAF COLLIMATOR
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Abstract
A multi-leaf collimator for radiation therapy in which the position of the leaves are determined by measuring a magnetic field allows to determine the leaf position with enhanced precision, and is at the same time robust to perturbations or disturbances. The magnetic sensor may comprise a magnetic encoder that varies in a predefined pattern along a lengthwise direction of the magnetic element, in particular according to a step function.
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Citations
33 Claims
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1-15. -15. (canceled)
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16. A multi-leaf collimator for radiation therapy appliances comprising:
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a plurality of leaves that are adapted to be moved in a movement direction (x) in and out of a beam path and to collectively define a preset contour; and a measurement device for determining a position of at least one leaf along said movement direction (x); wherein said measurement device is adapted to determine said position by measuring a magnetic field. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A method for measuring the position of at least one leaf in a multi-leaf collimator for radiation therapy appliances, comprising:
the step of determining the position of said leaf along a movement direction (x) by measuring a magnetic field. - View Dependent Claims (33)
Specification