What does MRI utilize to generate images?

MRI, or Magnetic Resonance Imaging, utilizes the magnetic properties of hydrogen atoms in water to generate images. The human body is composed of approximately 60% water, which contains a significant amount of hydrogen. When a patient is placed in an MRI scanner, a strong magnetic field is applied. This magnetic field causes the hydrogen nuclei (protons) within the water molecules to align with the field.

Once the hydrogen atoms are aligned, a radiofrequency pulse is sent through the body, which disrupts this alignment. When the radiofrequency pulse is turned off, the protons relax back to their original alignment with the magnetic field. As they do so, they emit signals that can be detected by the MRI machine. These signals are then processed by a computer to create detailed images of the tissues and structures within the body.

Understanding this process is crucial because it highlights the unique advantage of MRI in differentiating between different types of soft tissues, which is particularly useful for medical diagnostics in areas such as the brain, muscles, joints, and organs.