A method of fabricating a collimator assembly includes attaching a first layer to a second layer and forming channels through the attached first layer and second layer. Openings are disposed in the first and second layers before attaching the first and second layers. The openings of the first and second...http://www.google.de/patents/US7615161?utm_source=gb-gplus-sharePatent US7615161 - Simplified way to manufacture a low cost cast type collimator assembly
