MRI PHYSICS TEXT BOOK ARRT PRACTICE questions with correct answers

when use of an MRI contrast agent causes tissue to appear brighter which of the following has occurred ? CORRECT ANSWER positive contrast relaxation centers are regions of CORRECT ANSWER increased magnetizatiom when exposed to intense static magnetic fields, filtered human cells.. CORRECT ANSWER show no effect the main potential for biological response from RF is CORRECT ANSWER tissue heating electric current density induced by transient magnetic fields is measured in CORRECT ANSWER ampere per square centimeter the threshold for induction of magnetic phospjenes at low frequencies is approximately CORRECT ANSWER 3T/s the human responses reported during imaging with a 4T system are presumed to be due to CORRECT ANSWER transient magnetic fields bone fracture healing is helped by CORRECT ANSWER low frequency RF at the start of an MRI exam patient anxiety is generally due to CORRECT ANSWER claustrophobia