Which statement is true regarding MRI scans?

The statement that MRI scans have no ionizing radiation is true because MRI (Magnetic Resonance Imaging) uses powerful magnets and radio waves to create detailed images of organs and tissues within the body. Unlike X-rays or CT scans, which use ionizing radiation that can pose risks to cells and increase the chance of cancer, MRI is a safer imaging technique as it does not involve any radiation exposure. This is one of the primary advantages of MRI, making it suitable for repeated use in patients, including children and pregnant women.

In contrast, other options misrepresent the nature of MRI. For example, the notion that MRI requires sedation for safety is not universally true, as many patients can undergo MRI scans without sedation, although some individuals may require it due to anxiety or inability to remain still. Similarly, stating that MRI scans are used solely for brain assessment is incorrect because MRI is widely used for imaging various parts of the body, including the spine, joints, and soft tissues, among others. Lastly, the use of ionizing radiation in MRI scans is also inaccurate, as it distinguishes MRI from other imaging techniques where ionizing radiation is a concern.