# Grid Conversion - Video Lesson

This lesson is about a few mathematical problems related to grid conversion. We all understand that grids are good because grids reduce scatter and therefore increase contrast in the image, but using a grid does require that we increase our mass. We wouldn't normally increase our KVP when we use a grid we definitely would have to increase our mass. But how much do we actually have to increase our mass? Well, that depends on what we can call the grid conversion factor. Each type of grid has its own grid conversion factor, including no grid. It even has its own grid conversion factor, which we just call one. If our first mass is a particular number, we just multiply it by one, and we get the same number, which means when you don't use a grid, you continue using the same mass. But, of course, that's not true with other grids. Take for example, the lowest ratio grid, a five to one ratio grid. If we use that kind of grid, we have a grid conversion factor of two, which means we would have to double our mass in order to maintain the same receptor exposure, a six to one

## Lesson Quiz

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