Tungsten multiple layer multileaf collimator for using in a radiation system providing a radiation beam in a given beam direction, including a first layer of a plurality of radiation blocking tungsten leaves, the leaves being arranged adjacent one another so as to form two opposed rows of adjacently positioned leaves and being movable in a longitudinal direction, which is generally transverse to the beam direction, defining a radiation beam shaping field between the opposed ends of the leaves. A second layer of a plurality of radiation blocking tungsten leave, the leaves of the second layer being arraigned adjacent one another as to form two opposed rows of adjacently positioned leaves and being movable in a cross-over direction, which is generally transverse to the beam direction and angled with respect to the longitudinal direction, defining a radiation beam shaping field between the opposed ends of the leaves of the second layer.

The Applications of Tungsten Multiple Layer Multileaf Collimator

The tungsten multiple layer multileaf collimator is an important tool for radiation therapy dose delivery. It was originally used as a surrogate for tungsten alloy block field shaping and is now widely used for Intensity Modulated Radiation Therapy. For conformal radiotherapy the tungsten multiple layer multileaf collimator allows conformal shaping of the linear accelerator (LINAC) beam to match the borders of the target tumour. For intensity modulated treatments the tungsten alloy leaves of a multi-leaf collimator can be moved across the field to create Intensity Modulated Radiation Therapy distributions (tungsten alloy multi-leaf collimator's really provide a fluence modulation rather than intensity modulation).

The Advantages of Tungsten Multiple Layer 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 MLCs.

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.

Due to tungsten alloy materials has high density, which is 60% higher than lead, reduces the size of tungsten alloy ray shields, without affecting the radiation shielding effect the excellent radiation absorption of tungsten alloy. Since the environmental friendly characteristics of tungsten alloy, tungsten alloy for radiation shielding better than lead for radiation shielding in environmental protection.

During design of shielding, tungsten alloy radiation shielding is calculated according to requirements of shield to abate the multiple shielding materials' thickness.
Formula:K=e^{0.693 d / △1/2}
K: Shield weakened multiple
△ 1/2: The tungsten alloy radiation shielding material of the half-value layer values

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