This conversion chart can be used for general grid conversions based on recommended mid-kV ranges of each grid type.

See preceding page for more specific grid conversion considerations.

To use this chart, determine the correct conversion factor (multiplication number) by looking down the chart to the new grid being used, and multiply by this factor.

Example: If 7 mAs @ 70 kV is the technique for a shoulder using a 12:1 grid, what mAs should be used with a 5:1 portable grid?

Answer: The conversion factor for converting from 12:1 to 5:1 is.6.

7 mAs ×.6 = 4.2 mAs at 70 kV.

To check your answer, convert the other way from a 5:l to a l2:l grid. An increase in technique would be needed, and the conversion factor is 1.67. (4.2 mAs × 1.67 = 7 mAs, the original technique for the 12:1 grid.)