Which statement about grids used in mammography is true?

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Grids in mammography are used to improve image contrast by absorbing scatter before it reaches the detector. In practice, two common grid designs are used: linear grids, with lead strips running in parallel, and honeycomb grids, which have a hexagonal pattern of the strips. Both designs aim to reduce scatter and improve sharpness, with choices based on how the system is set up and the imaging task. The other statements aren’t correct because grids are indeed used in mammography, there isn’t only a single grid type, and grids are not optional when scatter control is needed.