
Magnetic resonance imaging (MRI) is a test that produces very clear pictures, or images, of the human body without the use of x-rays. MRI uses a large magnet, radio waves and a computer to produce these images as described here.
64-slice CT scanner. Beta blockers are usually given in conjunction with this type of scan, and an IV contrast material is used. Evidently the contrast dose is lower but the radiation exposure is higher, compared to the older 16-slice CT scans.
A patient undergoing an abdominal CT scan receives over 50 times more radiation than in a standard X-ray.
Xrays are very subjective in interpretation. It is best to get the original radiographer's reports (usually available from the lab who took the Xray films)
Risk is not only from radiation exposure, but may arise from dyes used, depending on individual sensitivity, so it is prudent to ask what contrast agents are in use for the proposed scan.