MRSO: Exam mark Questions with 100% Verified Answers

MRSO: Exam mark Questions with 100% Verified Answers ___________ diameter loop formed by tissues or devices with a __________ diameter contact point will increase the chance for patient burns. a. Large; large b. Narrow; narrow c. Large; narrow d. Narrow; large - c. Large; narrow As e-fields are produced in a loop of tissue or in a device, the contact area to the patient will transmit this energy. If the contact point is narrow, all that energy is forced through a small area which can cause a burn. 1.5T and 3T MR units typically have a maximum gradient peak of what? a. 20-35 mT/m b. 0-20 mT/m c. 30-50 mT/m d. 30-45 mT/m - d. 30-45 mT/m 4T/m is equal to what? a. 4000 G/cm b. 4G/cm c. 40 G/cm d. 400 G/cm - d. 400 G/cm 1T = 10,000 G 1m = 100 cm Therefore, 1 T/m=10,000G/100cm This means that 1 T/m=100 G/cm A conservative approach to breast feeding after a mother receives gad contrast is: a. To wait 12-24 hours to breastfeed after an IV injection of gad b. To pump and dump breastmilk for 48 hours after an IV injection of gad c. To continue breastfeeding immediately after receiving an IV injection of gad d. To mix formula with breastmilk for 24 hours after an IV injection of gad contrast - a. To wait 12-24 hours to breastfeed after an IV injection of gad 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 deflection of 45 degrees in a tested implant indicates that it deflects at a force equal to what? a. 0.5 gravity force b. 2 gravity force c. 0.25 gravity force d. 1 gravity force - d. 1 gravity force A deflection of 90 degrees due to translational force indicates how much force is experienced in the implant? a. 0.5 gravity force b. 2 gravity force c. 1 gravity force d. Undetermined - d. Undetermined Deflection of 45 degrees indicates equal balance between the gravity place on the implant and the translational force experienced by the implant. With 90 degrees, we cannot tell how much force the implant is experiencing; it will be greater than 2G. A gad ion is attached to a molecule called a/an? a. Chain b. Ligand c. Ion d. String - b. Ligand A ligand that attaches a gad ion in a chain-like molecule is called what? a. Captured b. Polarized c. Macrocyclic d. Linear - d. Linear A ligand that cages a gad ion is referred to as? a. Linear b. Captured c. Macrocyclic d. Polarized - c. Macrocyclic A macrocytic agent refers to a gad ion that is what? a. Small b. Polarized c. Caged in d. Attached in a linear chain - c. Caged in 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 comes in with a 1 cm brain aneurysm clip and you find the package which lists what metal it is made from. Which of the following metals would make it unsafe to scan this patient? a. Elgiloy b. Phynox c. MP35N d. 405 Stainless steel - d. 405 Stainless steel Phynox, elgiloy, titanium, and 316 stainless steel are non-ferrous. 17-7PH and 405 stainless steel are ferrous A patient has a brain aneurysm clip that is conditional up to 700 G/cm. Is this patient safe to be scanned when only considering the static magnetic field? a. Yes b. No - a. yes (aneurysm clip does not come within the 7T/m field) 700 G/cm = 7 T/m (100 G/cm = 1 T/m) A patient has an iliac stent and the manufacturer instructions say to not expose the implant to a SAR of 1.9 W/kg. You are scanning a knee with a transmit-receive coil. How do you scan this patient safely? a. The patient should be scanned with a receive only coil b. The implant will not receive RF heating c. The patient should not be scanned d. The patient should be scanned in normal mode - b. The implant will not receive RF heating 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