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 confidence. Access detailed flashcards and multiple choice questions. Boost your chances of success with explanations and hints. Get ready for your MRI exam 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 primarily influences the amount of RF energy absorbed during an MRI procedure?

  1. Patient's age

  2. Flip angle of RF pulse

  3. Strength of magnetic field

  4. Orientation of the patient

The correct answer is: Flip angle of RF pulse

The amount of RF energy absorbed during an MRI procedure is primarily influenced by the flip angle of the RF pulse. The flip angle determines how much the magnetic moments of the protons in the tissues are tilted away from the direction of the magnetic field. When the RF pulse is applied, it can either completely or partially reorient the spins of the hydrogen protons. A higher flip angle results in a greater population of spins being tipped into the transverse plane, which leads to a stronger signal being generated as these spins return to equilibrium after the RF pulse is turned off. This means that the MRI signal, or image quality, can greatly be affected by this parameter. Adjusting the flip angle can enhance contrast in images depending on the type of tissue being imaged and the specific imaging sequence used. Therefore, understanding and optimizing the flip angle is crucial for obtaining high-quality MRI images and ensuring adequate RF energy absorption.