About Radiation Dosage
Your doctor will order a radiology exam for you when it is needed for accurate diagnosis of your condition. There is no conclusive evidence of radiation causing harm at the level that is used for diagnostic exams. The benefits of diagnostic medical exams are vital to good patient care.
Radiation dose can be estimated for common exams. For comparison, in the United States each person receives about 3.0mSv (300mrem) of radiation exposure from background sources each year.
The following tables give dose estimates for some typical exams.
Examinations and Procedures
MRI and ultrasound procedures do not use ionizing radiation. If you have had an ultrasound or MRI examination, you are not exposed to radiation.
Sources: radiologyinfo.org, hps.org