Pre-Quiz – 2019 New York

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Question 1 of 5

1. Question

How many operating modes are there for a clinical or research MR scanner?

1
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2
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3
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4
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5
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Question 2 of 5

2. Question

How do SAR and B1+rms compare?

SAR defines the power taken up by the patient and B1+rms defines the transmitted RF energy strength
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SAR defines the limit of the RF power while B1+rms defines the limit of the gradient power
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SAR defines the power limit for adults while B1+rms defines the power limit for the pediatric population
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SAR is always greater than B1+rms
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SAR refers to magnetic fields while B1+rms refers to electrical fields
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Question 3 of 5

3. Question

For superconductive MR scanners, where is the strongest static magnetic field Bo found in superconductive MR scanners?

Near the bore opening at the radial center of the scanner
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Near the bore opening at the radial periphery of the scanner
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At the bore center at the radial center of the scanner
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At the bore center at the radial periphery of the scanner
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Circumferentially just at the edges of the 30 cm diameter spherical volume (DSV) from isocenter
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Question 4 of 5

4. Question

For superconductive MR scanners, where is the strongest magnetic spatial gradient (dB/dx, aka static field gradient) found in superconductive MR scanners?

Near the bore opening at the radial center of the scanner
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Near the bore opening at the radial periphery of the scanner
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At the bore center at the radial center of the scanner
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At the bore center at the radial periphery of the scanner
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Circumferentially just at the edges of the 30 cm diameter spherical volume (DSV) from isocenter
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Question 5 of 5

5. Question

Which of the following would present the greatest concern for arrhythmogenesis (i.e., the potential to induce a cardiac arrhythmia in the patient) in a superconductive 1.5T MRI scanner?

A 5’ 9” male patient with Harrington rods from T1-T8, T spine MRI study centered at T5
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A 6’ male patient with a 25 cm length of abandoned defibrillator lead extending from the upper outer left chest to the left lateral ventricular wall, left knee MRI study for meniscal tear centered at the tibia-femoral joint
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A 5’ 3” female patient with a 30 cm length of an abandoned pacemaker lead extending from the right upper chest to the left ventricular wall, acute stroke MRI centered on the eyes (canthomeatal line) with transmit-receive head coil being used
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5’ 8” female patient for cardiac MRI study with a 2.5 cm length of retained epicardial pacer wire/lead
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5’ 7” female ICU patient for MRI of the cervical spine centered at C4 to evaluate for cord compression with thermodilution Swan-Ganz catheter in a right distal pulmonary artery branch vessel
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Pre-Quiz – 2019 New York

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