MRI ARMRIT PHYSICS CRAM EXAM QUESTIONS WITH CORRECT ANSWERS

MRI ARMRIT PHYSICS CRAM EXAM QUESTIONS WITH CORRECT ANSWERS when use of mri agent causes tissue to appear BRIGHTER what oocurs: - Ans ️️ -positive contrast relaxation centers on regions of: - Ans ️️ -increased magnetization when exposed to intense static mag fields, cultured human cells: - Ans ️️ -show no effect the main potntial for biological response in RF is: - Ans ️️ -tissue heating electric current density induced by transient mag fields is measured in" - Ans ️️ -amperes/cm2 the threshold for induction of magnetic phosphenes at ion freq is approx: - Ans ️️ -3 T/s bone fracture healing is helped by - Ans ️️ -low freq rf start of mra exam, patient anxiety is due to - Ans ️️ -claustrophobia % of patients w/ claustro - Ans ️️ -5% operation of successful mri facility must include - Ans ️️ -call each patient CE of mri techs is - Ans ️️ -essential pulse seequences optional for imaging the CNS are not appropriate for whole body imaging bc: - Ans ️️ -T1 & T2 are too long the quench occurs and helium escapes, known bc: - Ans ️️ -donald duck voice proper quality control of mri system requires phantom testing: - Ans ️️ -dailiy principle hazard to patients and techs in mr environment is: - Ans ️️ -projectiles clearly marked exclusion line should be identified at: - Ans ️️ -the .5 mT fringe field after 90' the signal recieved from the patient is - Ans ️️ -the FID (free induction decay