Reason for large variability in mA between scanners?

For example in routine Head CT, the mA (tube current) changes between 140mA to 350mA between scanners.

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The "scout" series in these protocols changes between 3, 10, 30, 56, and up to 98 mA.

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(For reference feel free to look at the AAPM Adult Routine Head CT protocols document)

submitted by /u/louis_imad
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