Multiblade collimator

Abstract

A collimating device for controlling a radiation field of an X-ray radiated from an X-ray radiator. The device includes a plurality of first collimating leaves, a plurality of second collimating leaves, a beam generator, a detector, a memory, and a controller. The plurality of second collimating leaves oppose the first collimating leaves. The beam generator is configured to generate a beam. The beam emanates between the first collimating leaves and the second collimating leaves. The detector is configured to detect the beam. The memory is configured to store position information of each leaf of the first and second collimating leaves when the each leaf is determined to intersect the beam based on the detection. The controller is configured to position the each leaf based on the position information so as to control the radiation field.

Description

[0001] Cross References to Related Applications [0002] This application is based on and claims priority from prior Japanese Patent Application No. P2003-67559 filed on March 13, 2003, the entire contents of which are hereby incorporated by reference. technical field [0003] The invention relates to a collimator used in a radiotherapy device and controlling an irradiation field through a plurality of collimating blades. The invention also relates to a method of positioning collimating blades of the collimator. Background technique [0004] When using radiotherapy equipment or X-ray diagnostic equipment, it is very important to reduce the amount of X-ray exposure irradiated to a subject such as a human body. A number of techniques have been proposed to achieve a reduction in X-ray exposure, one well known technique is the use of collimators. A collimator reduces the radiation field by reducing the size of its aperture. The aperture size is controlled by adjusting the pos...

AI Technical Summary

Problems solved by technology

Therefore, the detection error (ie incorrect detection result) of the position of the collimating blades can also cause the error enlargement at the isocenter

In other words, slight detection errors can lead to errors in the isocenter beyond the required accuracy

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