MRSO: Exam 3 Questions with 100% Verified Answers

MRSO: Exam 3 Questions with 100% Verified Answers A contrast media with high relaxivity will do what when compared to contrast media with lower relativity? a. Produce more signal b. Produce less signal c. Improve resolution d. Produce more image noise - a. Produce more signal A ligand that cages a gad ion is referred to as? a. Linear b. Captured c. Macrocyclic d. Polarized - c. Macrocyclic A MR tech is distracted by another patient and brings a non-MR compatible O2 tank in the room which severely injures a patient. This is an example of what? a. Malpractice b. Negligence c. Infraction d. Tort - a. Malpractice A non-emergent quench can take approximately how long? a. 1 minute b. 20 seconds c. 5-15 mins d. 2- 4 mins - c. 5-15 mins An emergent quench will take approximately 1 minute. A patient has a carotid stent and is having an MR knee performed. In terms of patient heating, is this patient safe to scan? a. Yes b. No c. Yes, only if that patient is less than 200 lb d. Yes, only with a heat sink - a. Yes A patient has an insulin pump that is MR conditional. The manufacturer limits the implants to a spatial gradient of 5 T/m. According to this spatial gradient map, is it safe to scan this patient who is 6'5" for a foot MRI? a. Yes b. Any exam would be safe c. Have the patient apply pressure to the implant d. No - a. Yes A patient has removed a vagus stimulator with the leads left in, and is having a MR knee performed with the transmit-receive coil. In terms of patient heating, is it safe to scan? a. No b. Yes, only with heat sink c. Yes d. Yes, only if that patient is less than 200lb. - c. Yes Heating can only occur in areas where RF energy is exposed to. If the implant is not exposed to RF energy, heating will not occur. A patient is having an MR pelvis, has a brain stimulator and is advanced feet first. What are the risks with this implant associated to the gradient magnetic field. a. Electrical current induction b. Heating of stimulator c. None d. The only risk is associated with the static field - a. Electrical current induction A patient is sweating profusely during an MR pelvis exam. What can be done to reduce this heating? Select all that apply. a. Increase the concentrations/number of acquisitions b. Decrease TR c. Scan the patient feet first d. Use fat sat sequences e. Use a gradient echo sequence - a, e A patient is undergoing an MR brain and has pacing wires. What would make this exam safe to perform? Select all that apply. a. Use only spin echo sequences b. Ice pack on the patient chest c. Using a transmit-receive brain coil d. It is not safe ever e. Increase the flip angle f. Increase TR - c. Using a transmit-receive brain coil