Tungsten alloy leaf is an important component on the multi-leaf collimator, and is also the main part of an IMRT device, which can achieve conformal irradiation, thereby minimizing the leakage of radiation dose. There are at least 20 pairs of tungsten alloy leaves on the multi-leaf collimator. Wherein, IMRT is also known as intensity modulated radiation therapy.
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IMRT device is the direction of radiation therapy in the 21st century. The so-called intensity modulated radiation therapy refers to: On the basis of three-dimensional conformal irradiation, the output dose of the points in the cross-section of the irradiation field is adjusted according to the required way, so that the distribution of radiation in the human body conforms to the outer contour of the target area in three dimensions, while receiving high doses of lethal radiation at the target area, minimize the radiation exposure received by normal tissues and structures around the target area. Wherein, each tungsten alloy leaf is controlled by the program, so that the shooting field is shielded or opened. The timing of the opening and closing time varies with the position of the frame, which results in the spatial modulation of the shape and intensity of the shot.
