The Advantages of 4-Bank Tungsten Multileaf Collimator

The tungsten micro multileaf collimator (mMLC), is unique in having four sets of leaves, instead of the conventional two. Tungsten micro multileaf collimator has cross-leaves with 96 tungsten alloy leaves in 4 banks.

The advantages of 4-bank tungsten multileaf collimator:

Fast tracking: for parallel tungsten alloy leaves, aperture motion is determined by the time required to cover/uncover target edges parallel to leaf motion and by leaf speed. Since there aren't any such target edges for cross leaf - aperture formation, time is consequently several times faster than that of a parallel tungsten leaf collimator. In addition, cross tungsten alloy leaves smaller weight and lower friction enable higher leaf speed and reliability then conventional mMLCs.

Improved conformity: Cross tungsten leaf conforms better to complicated targets (e.g., doubly concave) and eliminates collimator rotation. Conformity is significantly improved even for a regular shape.

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