Radiology SA is conscious of keeping radiation doses to a minimum, especially for young patients who may need multiple scans over their lifetime. Protocols used by Radiology SA in selected cases can achieve a diagnostic quality CT chest at a dose of 0.3mSv, or the equivalent of about 3-5 chest X-ray examinations. This compares to a more standard CT chest dose of 7mSv, and naturally occurring background radiation, to which we are all exposed, of 2mSv per annum. The case ...