Is there a "gamma ray" in MRI? This is the best.

X-ray (chest X-ray) and CT (multi-slice scanning) have rays. Nuclear magnetic resonance (NMR) has no rays, but is a stereoscopic imaging, so the diagnosis is more detailed and accurate, and the cost is higher. For example, lumbar CT is about 482 yuan, and lumbar MRI is about 906 yuan, which is the charge of a second-class hospital. I just asked, and I'm going to check (.