What type of imaging technique is MRI?

Magnetic Resonance Imaging (MRI) is considered a non-invasive imaging technique. This is because it does not require any incisions, injections, or invasive procedures to obtain images of the body. MRI works by using strong magnetic fields and radio waves to generate detailed images of organs and tissues inside the body. The non-invasive nature of MRI allows for a thorough examination without the risks associated with surgical or invasive procedures, making it a safer option for diagnosing various medical conditions.

In contrast, the other choices refer to methods that entail different procedures or characteristics. Radioactive imaging typically involves the use of radioactive materials, as seen in techniques like Positron Emission Tomography (PET). X-ray-based methods depend on ionizing radiation to create images, which differ fundamentally from MRI technology. Invasive procedures generally involve entering the body or modifying it in some way, which is not the case with MRIs.