Magnetic resonance imaging

Definition

Magnetic Resonance Imaging (MRI) is a medical imaging technique used to visualize internal structures of the body using magnetic fields and radio waves. It relies on the principles of nuclear magnetic resonance to generate detailed images of organs and tissues.

5 Must Know Facts For Your Next Test

1. MRI machines utilize strong magnetic fields, typically generated by superconducting magnets in solenoids.
2. The magnetic field strength in MRI systems is measured in teslas (T), commonly ranging from 1.5T to 3T for clinical use.
3. Solenoids are crucial components in MRI systems because they produce uniform magnetic fields essential for accurate imaging.
4. Radiofrequency coils in MRI machines act as both transmitters and receivers, sending radio waves into the body and detecting emitted signals from hydrogen nuclei.
5. MRI does not use ionizing radiation like X-rays or CT scans, making it safer for repeated use.

Review Questions

• What component of an MRI machine generates the strong magnetic field required for imaging?
• How does the strength of the magnetic field in MRI systems typically range for clinical applications?
• Why are solenoids important in the functioning of an MRI machine?

Related terms

Solenoid: A cylindrical coil of wire acting as a magnet when carrying electric current, producing a uniform magnetic field.

Tesla (unit): The unit of measurement for the strength of magnetic fields, commonly used to describe MRI machine capabilities.

Nuclear Magnetic Resonance: $$\text{A physical phenomenon where nuclei in a magnetic field absorb and re-emit electromagnetic radiation, forming the basis for MRI technology.}$$