The Structure of Tungsten Alloy Multi-leaf Collimator

1: No focusing structure. Early MLC is mainly used for small lesions in the head and ill miniature MLC, mostly pan structure leaves no focus. This leaves the vertical and horizontal thick blade used in all translational motion, the same size and shape of the radiation field is composed of the upper and lower blades, can not be eliminated through shot penumbra, which will result in a larger clinical unacceptable penumbra.

2: Single-focusing structure. : This structure makes all the blades are in a circle with radiation to the radiation source to the distance of the circumference of the bottom surface of the blade radius of movement, so that the end face of the blade is always parallel with the beam, eliminating wear shooting direction of the blade movement on the penumbra . However, in the direction perpendicular to the blade movement, due to the width of the blade up and down and so on, they still have to wear shot penumbra.

3: double-focusing structure. Double-focusing structure is a multi-leaf collimator tungsten alloy single-focusing structure of each leaf is processed into non-monospaced divergence like in the width direction, face showing the trapezoidal small great, upward extension cord should intersect each end to point sources. This structure can eliminate wear shoot penumbra.

4: leakproof shot structure. Leakproof shot structure of the alloy multi-leaf collimator leaves processed into tungsten each side with a groove, the other side with a tenon that between two adjacent pieces to bump-groove laminated, using ray only travels in straight lines Features get a good shot of leak-proof effect.

5: over the center line design. Blade movement over the center line travel is a necessary condition to achieve strong performance conformal irradiation and become one of the important indicators to measure the strength of the modern MLC function, tungsten alloy multi-leaf collimator leaf over the center line travel requirements should be as large as possible generally not less than 12cm.


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