Multileaf Collimator Curved Leaf Interlocks

The patent applies curvature by forming rounded corner parts at the intersections of the protrusion and groove stepped regions. Instead of sharp corners that concentrate stress, the corner parts are formed with a radius of curvature that distributes stress evenly across the leaf structure. This allows the leaves to be made thinner for higher resolution while maintaining sufficient strength to prevent cracking or breakage during operation.

The patent resolves this contradiction by introducing curved transition regions at the corners where the protrusion and groove stepped structures meet. The rounded corner parts with appropriate radius of curvature eliminate stress concentration points while maintaining the interlocking protrusion-groove structure that prevents radiation beam leakage. This allows both functions to coexist: beam leakage prevention through the stepped structure and stress distribution through the curved transitions.

The patent applies the nesting principle through the protrusion-groove interlocking structure where the protrusion of one leaf fits into the groove of the adjacent leaf. This nested configuration allows the leaves to be positioned closer together with smaller gaps, preventing radiation beam leakage even when the leaves are made thinner for higher resolution. The interlocking structure effectively bridges the gap between adjacent thin leaves.