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MRSO: EXAM 2 (ACTUAL) 2024 QUESTIONS AND ANSWERS
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MRSO: EXAM 2 (ACTUAL) 2024 QUESTIONS AND ANSWERS
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MRSO: EXAM 2 (ACTUAL) Which of the following techniques can be used to reduce the heating in a fast spin echo? a. Increase the TE spacing b. Increase the flip angle c. Tell them to hold their breath d. Reduc e the TR - ANSWERS -a. Increase the TE spacing What is the ICNIRP occupational workers dose for magnetic flux limit for the head and torso? a. 2 Tesla b. 14 Tesla c. 400 milliTesla d. 8 Tesla - ANSWERS -a. 2 Tesla The ICNIRP set the occupational dose limit for the head & torso is 2 Tesla and 8 Tesla for the extremities. For the general public, the limit for any body part is 400mT. Which of the following is true of a gad contrast media? Select all that apply. a. Gad has 7 unpaired electrons b. Gad will shorten T1 relaxation times c. Gad is paramagnetic d. Gad demonstrated ferrous properties when placed in a strong static magnetic field. - ANSWERS -a, b, c Why does a fast spin echo produce more heat than a conventiona l spin echo sequence? a. It has more gradient activators b. It doesn't use a 180 degree RF pulse c. It doesn't d. It contains more 180 degree refocusing pulses - ANSWERS -d. It contains more 180 degree refocusing pulses (Has 4x the energy than 90 degree p ulses) ___________ 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 - ANSWERS -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. Which of the following is measured in T/m/s? a. Spatial gradient b. Maximum gradient peak c. The rise time d. The slew rate - ANSWERS -d. The slew rate What is the name of the gradient coil used to produce axial images? a. Transverse coil b. Receiver coil c. Golay coil d. Maxwell coil - ANSWERS -d. Maxwell coil What is the name of the gradient coil used to produce sa gittal and coronal images? a. Transverse coil b. Golay coil c. Maxwell coil d. Receiver coil - ANSWERS -b. Golay coil ("saddle coil")The benefits of buying summaries with Stuvia:
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