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b Electronically collimated image to optimise the region of interest.
When images have been electronically collimated, image boundaries may no longer correspond to the original field size and unnecessary exposure may easily go unnoticed to the responsible radiologist.
Since the collimated image produced by the sight is only truly parallax free at infinity, the sight has an error circle equal to the diameter of the collimating optics for any target at a finite distance.
These techniques use what's called waveguide grating or waveguide hologram to progressively extract a collimated image guided by total internal reflection (TIR) in a waveguide pipe.
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All images had been processed in a standard and a lung reconstruction kernel, and all data sets were stored in the PACS system, as well as the original 0.625 mm collimated images.
a Two-millimetre collimated CT images at initial diagnosis shows bilateral centrilobular ground-glass nodules, thin-walled cysts and a single air-trapping zone.
With post-processing techniques in digital imaging it is possible to apply digital shutters to the image after acquisition and thus electronically collimate an image to the area of interest.
The ability to electronically collimate an image after acquisition carries the risk of losing important information.
The ability to electronically collimate an image after acquisition carries the risk of overexposure.
The ability to electronically collimate an image after acquisition may serve to enhance contrast in the region of interest.
Especially in children, who come in varied sizes and tend to move around a lot, it is tempting to use a larger field size and electronically collimate the image to an optimum afterwards.
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