Multi-leaf collimator

Details Multi-leaf collimator Multi-leaf collimator

2006-08-22

2006-08-22

Bruce, David V. (Department: 2882)

X-ray or gamma ray systems or devices

Beam control

Collimator

C378S147000

Reexamination Certificate

active

07095823

ABSTRACT:
A multi-leaf collimator is disclosed which alleviates the problems of inter-leaf leakage and pixellation. The collimator comprises a first multi-leaf collimator set, a second multi-leaf collimator set at an acute angle to the first, and a third multi-leaf collimator set at an acute angle to the second. Each multi-leaf collimator set will usually include a pair of leaf banks mutually opposed to each other. The acute angle between the first and the second multi-leaf collimator set is preferably the same as the acute angle between the second and the third set. A suitable angle is about 60°. To improve the penumbra characteristics, (i) the leaves of the multi-leaf collimator closest to the radiation source can be deeper in the direction of the radiation than the leaves of a multi-leaf collimator more distant from the radiation source, (ii) the leaves of the multi-leaf collimator furthest from the radiation source can be shallower in the direction of the radiation than the leaves of a multi-leaf collimator closer to the radiation source, (iii) the tips of the leaves of the multi-leaf collimators can be rounded (iv) the radius of curvature of the tips of the leaves of the multi-leaf collimator closest to the radiation source can be greater than the radius of curvature of the tips of the leaves of a multi-leaf collimator more distant from the radiation source, and (v) the radius of curvature of the tips of the leaves of the multi-leaf collimator furthest from the radiation source can be less than the radius of curvature of the tips of the leaves of a multi-leaf collimator closer to the radiation source. In general, it is also preferred that the first multi-leaf collimator is closest to the radiation source, the third multi-leaf collimator is furthest from the radiation source, and the second multi-leaf collimator is between the first and third multi-leaf collimators.

REFERENCES:
patent: 4882741 (1989-11-01), Brown
patent: 4987309 (1991-01-01), Klasen et al.
patent: 5166531 (1992-11-01), Huntzinger
patent: 5748703 (1998-05-01), Cosman
patent: 0 314 214 (1989-05-01), None
patent: 03-009767 (1991-01-01), None
patent: WO 99/17305 (1999-04-01), None

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