You have discovered two underutilized radiographic grids in your department. Both grids have the same grid ratio, but grid A is noticeably heavier than grid B. What conclusion can you reach regarding these two grids?

What will be an ideal response?

Although both grids have the same grid ratio, both grids do not have the same lead content. The difference in weight is most likely due to the extra lead in grid A. This extra weight could be due to a higher grid frequency, thicker lead strips, heavier interspace material such as aluminum instead of plastic fiber, or higher lead strips in grid A. Even though both grids have the same ratio, their contrast improvement factors may not be the same due to the difference in lead content. Scatter cleanup with a grid involves more than simply grid ratio.