Tungsten alloy leaf has high atomic coefficient and high density so that it has a strong ability to shield rays in a multi-leaf collimator. It has been reported that multi-leaf collimator with tungsten alloy leaf improves both the accuracy and the effectiveness of radiation therapy and reduces the time for every treatment dose, which potentially increases the number of patients treated every day. The multileaf collimator is presently an important technical tool either to replace conventional shielding for static conformational radiotherapy or to administer 3D-planned dynamic radiotherapy.
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Tungsten alloy can be made with different shapes and different strengths according to different formulas. And the materials used to make leaves of multi-leaf collimator are generally tungsten alloys containing 95%W. Each tungsten alloy leaf has the advantages of strong ray shielding ability, surface abrasion resistance and good mechanical strength, which ensure that the leakage rate of the rays are minimized, and the friction coefficient between the leaves can be reduced.
