Which imaging technique is least likely to use ionizing radiation?

Magnetic Resonance Imaging (MRI) is the imaging technique least likely to use ionizing radiation because it primarily relies on strong magnetic fields and radiofrequency waves to create images of organs and tissues. MRI is particularly advantageous in that it does not expose patients to radiation, making it a safer option for certain diagnoses, especially in vulnerable populations such as children and pregnant women.

In contrast, X-rays, CT scans, and fluoroscopy all utilize ionizing radiation to generate images. X-rays provide a quick snapshot of the internal structures, CT scans offer cross-sectional imaging often used for more detailed analysis, and fluoroscopy involves real-time imaging that can be used for guided procedures. While these techniques are extremely useful in medical settings, their reliance on ionizing radiation introduces potential risks, particularly with repeated exposures. Thus, MRI stands out as the method that avoids this inherent risk.