Multi-leaf Collimator for CT scan Radiation Protection

As we know, CT scan was performed with the patient in the supine position, to avoid any let out of the radiation, owning to the high density and good radiation absorption, tungsten alloy material is widely used for the linear accelerator equipped with 40 pairs of multi-leaf collimator (MLC), which is used for CT scan radiation protection in the mantle field.

The MLC's shapes could be designed into take the shape of the conventional customized blocks used for treatment of mantle field, also it could be sheet or ultra-thin sheet, etc. The anterior mantle field is divided into three separate MLC segments with the collimator kept at 0°. The first MLC segment is shaped to cover the neck, clavicular regions and mediastinum. The second and the third MLC segments covered the right and left axilla, respectively. Tungsten alloy material is used for the leaves. Each leaf is about 10 mm or less, and is individually motorized and computer controlled to allow precise control of the shape of the beam.

Depending on the superior properties of tungsten alloy, MLC is located between the source of radiation and the patent. By opening tungsten alloy leaf, the operator allows radiation to pass through at that point but not to let out. This gives the operator precise control over the shape of the beam during CT scan.

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