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The first and second lenses operate jointly to concentrate and collimate the incident light beam.
Once you can gather up and collimate the light coming from an LED, you can use binary optical elements - holographic diffusers - to take that round, highly collimated beam and put it out into designer patterns.
Most HRCT protocols use thin collimation (at intervals or continuously) from apices to costophrenic angles in the supine position with image reconstruction using an edge-enhancement algorithm.
The excitation and transmitted light is collimated by a set of focusing lenses on either side of the sample chamber.
The TPIAL emits a highly collimated beam of infrared light for precision aiming, as well as a separate infrared illumination beam with adjustable focus.
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