mA Modulation or Automatic Exposure Control

• Different methods by different manufacturers

• All aim to take the guesswork out

• Should be optimised for each protocol, e.g. colon vs. abdomen

• Should be set to be routinely ‘on’

• NRPB 2003 survey - 50% UK scanners have it…

• …only 15% sequences use it

• We have a legal and ethical responsibility