Tungsten alloy multileaf collimator firstly used tungsten alloy leaves to shape structures in 1965 and has improved rapidly to modern day operation in radiotherapy. Tungsten alloy multileaf collimators are now widely used and have become an integral part of any radiotherapy department as they have strong shielding performance against rays while ensuring high accuracy. A pair of tungsten alloy leaves can form a rectangular irradiation field, and multiple pairs of tungsten alloy leaves can be combined to form an irradiation field of any shape.
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Multileaf collimators were primarily used for conformal radiotherapy, and have allowed the cost-effective implementation of conformal treatment with significant time saving, and also have been adapted for use for intensity modulated radiation therapy treatments. For conformal radiotherapy, the multileaf collimator allows conformal shaping of the beam to match the borders of the target tumor. For intensity modulated treatments, the tungsten alloy leaves of a multileaf collimator can be moved across the field to create intensity modulated radiation therapy distributions.
