Magnetic Resonance Imaging (MRI) Practice Test

Disable ads (and more) with a membership for a one time $2.99 payment

Prepare for the MRI Test with our comprehensive study materials. Utilize flashcards and multiple choice questions with hints and explanations to enhance your readiness. Begin your path to success today!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

Practice this question and more.

What defines active shielding in an MR scanner?

Passive coils surrounding the magnet
Superconducting windings within the MR scanner
Coils external to the scanner
Cooling systems of the magnet

The correct answer is: Superconducting windings within the MR scanner

Active shielding in an MR scanner is defined by superconducting windings within the magnet. This concept involves utilizing superconducting coils that generate a magnetic field, which actively counteracts the stray magnetic field produced by the primary magnet of the MRI scanner. By doing so, active shielding enhances the overall homogeneity of the magnetic field within the imaging volume while simultaneously reducing the fringe field's impact on nearby equipment and the environment. This technology is particularly advantageous as it allows for a more compact magnet design, minimizing the need for larger physical distances between the scanner and other objects or individuals. Furthermore, incorporating superconducting windings increases the efficiency of the overall magnetic system, providing high-quality images while also ensuring patient and operator safety. The other options reference various components that do not actively adjust or mitigate the magnetic field in the same manner. For instance, passive coils surrounding the magnet focus on absorbing stray magnetic fields rather than generating a compensatory magnetic field as in active shielding.