| 摘要 |
Apparatus for collimating particle emanations, whether photons or material particles, comprises a collimator plate and a motion means. The collimator plate is made of an attenuating material capable of attenuating the particle emanations. The collimator has a plurality of apertures of defined cross-sectional diameter, cross-sectional shape and three-dimensional distribution which restricts the emanations to pass through the plate in a plurality of defined collimated beams. The motion means moves the collimator to enable the plurality of collimated beams to form a defined combined beam having a preselected cross-sectional distribution of flux, when averaged over a specified time. The resolution of the collimator is essentially the cross-sectional diameter of the apertures, which is limited only by technical manufacturing capabilities. This allows the final imaging or detecting resolution to be essentially the intrinsic resolution of the imaging or detecting device, such as a gamma camera, independent of the energy of the emanations. The collimator may also be used to produce beams of particles with predefined cross-sectional size, cross-sectional shape and cross-sectional relative flux, averaged over time, for physics experiments or other uses.
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