초록 ▼

In a radiation therapy machine it is desirable to produce irregular radiation field shapes in order to shield critical organs not invaded by the tumor. A multileaf collimator is formed of a multiplicity of heavy metal bar leaves driven relative to frames which are driven relative to jaws of a rectan

In a radiation therapy machine it is desirable to produce irregular radiation field shapes in order to shield critical organs not invaded by the tumor. A multileaf collimator is formed of a multiplicity of heavy metal bar leaves driven relative to frames which are driven relative to jaws of a rectangular field collimator by electric motors and flexible cables.

대표청구항 ▼

An apparatus for radiotherapy treatment of a patient comprising: an electron linear accelerator means for generating x-rays at an x-ray source target; a set of four moveable jaws mounted on a jaw frame between said x-ray source target and the patient, said set of jaws defining a rectangular x-ray fi

An apparatus for radiotherapy treatment of a patient comprising: an electron linear accelerator means for generating x-rays at an x-ray source target; a set of four moveable jaws mounted on a jaw frame between said x-ray source target and the patient, said set of jaws defining a rectangular x-ray field; mounting means for mounting a leaf means on said jaw frame, said mounting means including a main leaf support frame; a pair of subframes, each of which is linearly movable mounted from said frame, said subframes being coplanar; a multiplicity of leaves of material substantially opaque to x-rays, said leaves being provided with means to make them linearly movable relative to each said subframe, each leaf being capable of extension beyond a field mid-line, the length of each said leaf being shorter than half of a maximum field length capability of said jaws measured in the direction and plane of said leaves; subframe drive means for independently varying the distance of each subframe from the axis of the rectangular x-ray field, said subframe drive means being substantially coplanar with said subframe; leaf drive means for independently varying the position of each leaf with respect to its corresponding subframe, said leaf drive means being substantially coplanar with each leaf; and computer control means for controlling said subframe drive means and said leaf drive means to provide a dynamically changing radiation field shape during the course of radiation treatment of the patient.