title: [Dual sieve-mesh collimator].
abstract: In this paper is advanced a new type of collimator-dual sieve-mesh collimator. Its principle is to use scanned electronic beam to attack 400 matrix-arranged wolfram targets of the square holes on the upper side of the main collimator and created 400 small X-ray fields sized by 10 mm x 10 mm. These X-ray fields will leave on its center 400 smaller X-ray fields sized by 5 mm x 5 mm after being further collimated by a sub-collimator. What's more, 16 different groups of such X-ray fields can be left on the center of the same field by controlling the all-round movement of the main collimator and sub-collimator in proper order and by scanning it round by round and mesh by mesh with electronic beams. It is these ting fields groups that make up various treatment fields with different energy (Dosage). This type of collimator can replace and simplify all other present collimators on accelerators and conformal-intensity modulation radiotherapy equipment. It has advantage of reducing the costs of radio-therapy equipment and making conformal and intensity modulation radiotherapy easier to perform.
authors.affiliation: Equipment Department of Wenzhou Medical College First Affiliate Hospital.
authors.forename: X
authors.initials: X
authors.lastname: Lian
authors.forename: Z K
authors.initials: ZK
authors.lastname: Wang
authors.forename: L B
authors.initials: LB
authors.lastname: Zhuo
mesh_terms: D004867:Equipment Design; D010315:Particle Accelerators; D020266:Radiotherapy, Conformal / Q000295:instrumentation*