An MRI machine is more than just a big, claustrophobia-inducing tube. How much do you know about what's going on inside -- or what's going on inside your body while you're in there?
The biggest and most important component of an MRI system is the:
The first MRI examination was performed on a human being in:
For the purpose of an MRI, which element within the body is most important?
An MRI system uses an RF pulse to change the:
- spin of atoms' nuclei
- shape of the nuclei
- amount of metal in a person's cells
The most common type of magnet used in MRI systems is the:
- resistive magnet
- permanent magnet
- superconducting magnet
In a superconducting magnet, the coils are bathed in liquid helium:
- to keep the system from overheating
- to reduce the amount of resistance in the wire
- to keep the area around the coils sterile
An MRI system creates an image when:
- All the hydrogen atoms in your body line up, creating an outline.
- Hydrogen atoms facing opposite directions cancel each other out, creating a reverse outline.
- The hydrogen atoms go back to their normal position, releasing energy.
What component of an MRI system allows it to choose exactly where in the body to acquire an image?
- Gradient magnets
- Contrast injector
What does an MRI system use to convert mathematical data into a picture?
- RF pulse converter
- Fourier transform
- electron precession
MRI scans tend to be very noisy. The noise comes from:
- opposition of the main magnetic field to the current in the gradient magnets' wires
- movement of the magnet from place to place
- stray particles within the system being thrown about by the magnetic field