What is the effect of a high-ratio grid on an x-ray exposure?
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A grid is like the focusing lens in a camera. A high-ratio grid permits FEWER x-rays to pass through it from the animal (fewer X-rays reach the film), but you get a better, higher resolution radiograph.
The grid prevents scattered radiation from reaching an x-ray film, so that only the primary, directly aimed x-rays penetrate straight into the animal for the best image.
An x-ray grid is basically a plate made of alternating strips of lead, which block scattered x-rays, interspersed between strips of plastic or aluminum, which allow the straight x-rays through.
