Which imaging technique is least likely to use radiation?

MRI (Magnetic Resonance Imaging) is the imaging technique that is least likely to use radiation. The primary principle behind MRI involves the use of strong magnetic fields and radiofrequency pulses to visualize the internal structures of the body. This technology allows for detailed imaging of soft tissues without the need for ionizing radiation, making it an excellent choice for various diagnostic purposes, such as assessing brain tumors, spinal injuries, and joint issues.

In contrast, the other imaging modalities listed—X-ray, CT scans, and fluoroscopy—all involve exposure to ionizing radiation. X-rays utilize radiation to create images of the body's internal structures; CT scans use a series of X-ray images to construct cross-sectional views of the body; and fluoroscopy provides real-time moving images of the interior of the body using a continuous X-ray beam. Understanding the differences in radiation exposure among these techniques is important for making informed choices in medical imaging, especially considering the risks associated with radiation.