[TeMPOraL]

> I don't know where Scott got 30, but maybe the kidney screening is multiple scans or otherwise higher dose.

Scott called it "multiphase abdominal CT". Quick searching on-line suggests[0] that the "multiphase" here stands for doing 3-4 scans within a minute or two of each other, as the contrast agent diffuses through the organ, giving you multiple images that inform you about different parts of the target structure.

> Wiki gives ~10 Sv for an abdominal CT; (...) Or he was wrong by a factor of 3

If what I wrote above is correct, then it tracks - ~10 mSv for one CT, multiplied by 3-4 scans done in a multiphase CT, gives you ~30-40 mSv, which matches the number Scott posted.

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[0] - https://www.barnardhealth.us/dynamic-contrast/multiphasic-im... - First link I found; CTRL+F "multiphase", as the relevant information is spread throughout the comments section.