MRI and X-Rays: Myths and Truth
First of all, what is the difference between an MRI (Magnetic Resonance Image) and an X-ray (electro-magnetic wave of high energy with very short wavelength)? The above image on the left is an MRI of a left knee. The image on the right is an x-ray of a left knee. While they are both diagnostic imaging devices and equally important tools (in some circumstances) for your physician, there are important differences. X-rays are mainly used for evaluating detailed images of bones and sometimes diseased tissue. An MRI is better suited for evaluating soft tissue like tendons, ligaments, muscles, organs, etc. The MRI shows a series of “slices”, allowing abnormalities to be seen from varying angles.
Most X-rays are now digital, like the ones we use at SOA, a safer and more effective technology than the older “films”. The digital aspect also allows easy transport of the images onto a CD for sharing between physicians when needed. The digital x-ray results are immediately available to your physician at your appointment.
Dispelling a myth: Naysayers may have you believe that X-rays aren’t safe because of radiation. Fact is, we are surrounded by radiation on a daily basis and this is known as “background” radiation. The earth itself emits radiation and certain parts of the country, like Colorado, have higher radiation levels than areas near the coast at sea level. Frequent airline flyers receive more radiation than those who don’t fly. Surprisingly, the highest source of radiation is in our homes!
So how does that relate to when we need an x-ray at your orthopedic visit? A typical adult will receive a total dosage of 620 “millirem” each year from background, diet, industrial, and medical radiation with 50% coming from “background” radiation. Put that into perspective with a single hand or foot x-ray at 0.5, a very small amount. In fact, our food contains radiation and we ingest about 30 “millirem” a year just in our diets! Even a can of soda emits radiation. An interesting website will evaluate your estimated annual radiation at https://www.nrc.gov/about-nrc/radiation/around-us/calculator.html
At Sarasota Orthopedic Associates, we may utilize an MRI to provide a more comprehensive diagnostic evaluation of the soft tissue structures which are not seen on an x-ray. An MRI may identify a condition much faster than traditional methods, and allow you to receive more expeditious treatment. Our MRI services are readily available to our patients, however many physicians refer to us for scans other than orthopedic conditions because of our state-of-the-art technology. Our Signa HD 1.5 scanner is breakthrough technology with lightning speed and breathtaking image quality. We turn around studies in 24 hours and are many times able to schedule patients on a same day basis.
One of the more fascinating technologies is an extremity MRI, specifically for hand, wrist, elbow, knee, or foot. It’s a compact MRI device allowing the patient to rest outside the scanner, eliminating the magnetic “noise” close to your head! You may even read or nap during the exam. That extremity MRI is available for our patients as well as those referred from other offices.
At Sarasota Orthopedic Associates, our mission is to get our patients back on their feet, back to work, back in the game, and back to life. Check out our website at www.SOA.md or call us at 941-951-2663 for more information. You may also schedule an appointment at the home page of our website.
Sources: SOA.md website; ICRP; ASRT; USNRC