This is another very common question: Hey Doctor, Magnetic Resonance Imaging ? Magnetic Resonance Imaging does not have ionizing radiation!
The imaging methods that use x-ray are mammography, x-rays, computed tomography.

Compared to conventional tomography, "helical" tomography also allows use of smaller doses of radiation, as well as being much faster. These multislice equipment can 2, 8, 16, 64 and up to 128 channels , translating greater agility in the test, which is so important for the acquisition of cardiac images, for example.

Magnetic Resonance (MR) is in analogy a fantastic "magnet" that can be <300,000 times stronger than Earth's magnetic field. It is necessary that only part of the studied body is inside this magnificent "magnet" that will align the billions of atoms of your body. They are thus emitted radiofrequency pulses (you probably already hear about it on radio, TV) in the "tuning" of your atoms that will then allow the capture of the "signal" of your body, translated by a powerful computer in image. Incredible right? And 100% without ionizing radiation !!

Magnetic resonance imaging techniques have come a long way, allowing for a number of dynamic, functional studies, including "whole body" images! Being one of the safest diagnostic imaging methods today , enabling early diagnosis of many diseases.

Note:
The information posted on this site should not be considered medical advice. Do not forget that Medicine is a science in constant transformation and countless works and evidences are modified every day.
If you are a non-medical reader, consult your physician about any medical issues related to diseases, conditions, symptoms, diagnosis, treatment and side effects.