Tungsten Alloy Leaf in 80 Leaves Multileaf Collimator

One of the complications in calculating the overall transmission of the leaf bank is in accurately accounting for the complex leaf shape. The individual tungsten alloy leaves have a projected nominal width of 1 cm at isocenter 100 cm" and a physical thickness of 6.13 cm at their thickest point. The tungsten alloy leaves of the multiLeaf collimator(MLC) are single focused, i.e., the sides are shaped to converge at the source but each tip is rounded in the vertical direction in order to present an approximately constant penumbra at the isocenter plane. The radius of curvature at the center of the tungsten alloy leaf profile is 8 cm. The remainder of the tip profile is defined by two lines, each being tangent to the circular arc and at an 11.3°angle to the vertical.

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