Tungsten Alloy Multileaf Collimator Model

For each multileaf collimator, two banks of independent tungsten alloy leaves face each other and travel linearly perpendicular to the beam central axis. Orthogonal to the direction of motion, the tungsten alloy leaf edge is parallel to the beam ray line from the target. A cross-sectional and front view of the 80-leaf multileaf collimator. All details of the tungsten alloy leaf design were included in the tongue-and-groove used to reduce radiation leakage through interfaces between adjacent leaves and the complex rounded leaf tip.

As the figure below, the central 3 cm portion of each tungsten leaf end is circular with a radius of curvature of 8.0 cm. Beyond this, the tungsten alloy leaf end is straight and at an angle of 11.3° relative to the vertical axis. The multileaf collimator leaf material is a sintered tungsten alloy. These tungsten alloys have densities in the range of 17.0 to 18.5 g/cm3; 17.7 g/cm3 was chosen as a base.

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