Cancer screening tools like MRI, CT, and PET scans each serve different purposes, and understanding when and why they’re used matters just as much as the scan itself. These technologies don’t “find cancer” in the same way—each looks at a different aspect of structure or function, and each comes with its own trade-offs. MRI (Magnetic Resonance Imaging) uses magnetic fields and radio waves to create highly detailed images of soft tissue. It does not use ionizing radiation, which makes it especiall