What is true regarding the lead strips in focused grids?

The statement that lead strips are angled to match the divergence of the x-ray beam is indeed true for focused grids. Focused grids are designed to improve image quality by reducing scattered radiation that can fog the image. The lead strips in these grids are not arranged parallel to one another as they would be in parallel grids; instead, they are angled. This angling is crucial because it allows the lead strips to align with the path of the x-ray beams as they diverge from the focal spot of the x-ray tube. By matching the angle of the lead strips to this divergence, focused grids can effectively absorb scattered rays while allowing direct x-rays to pass through, resulting in clearer images with higher contrast.

Other options, while seemingly relevant, do not accurately describe the design or function of focused grids. For instance, lead strips being perpendicular to each other is a trait of parallel grids, while the notion of two sets of lead strips at 90 degrees pertains to cross-hatched grids, not focused grids. Likewise, focused grids do not feature lead strips that are closer together compared to other grid types; their primary defining characteristic is the angling of the strips, tailored to the beam divergence.