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: The location of the coils installed in the MRI scanner, from the inner point closest to the patient to the outer most edge, are: Radiofrequency coils, gradient coils, shim coils, main magnet
: _________ would be used to contain the RF in an MR magnet room. A. Steel B. Lead C. Aluminum D. Copper Copper
: The unit of measurement of the magnetic field surrounding the periphery of the MR scanner is expressed as: A. Ohm B. Volts C. Gauss D. Tesla Gauss
Radiofrequency (RF) shielding can be achieved by lining the scanner room walls with: A. Lead B. Aluminum C. Steel plates D. Copper Copper
Active shielding can be defined as: Superconducting windings within the MR scanner, reducing the fringe magnetic field
What is the daily/weekly QA/QC indicator testing for the accuracy of the magnetic field in determining coil tuning and consistent magnetic field strength? A. Transmit gain B. # of spokes C. NSA D. Center frequency Center frequency
Passive shielding can be accomplished by lining the MR room with ___________. A. Lead B. Steel C. Copper D. Aluminum Steel
___________ could be used to line the walls and/or floors of the MR magnet room to reduce the fringe field, and is defined as __________ shielding. A. Copper; active B. Steel; active C. Steel; passive D. Copper; passive E. Lead; passive Steel; passive
The _____ is located within an equipment room. A. Magnetic shielding B. RF power amplifier C. Gradient coils D. RF coils RF power amplifier
The liquid cryogens are cooled in a superconducting magnet at a temperature of _________? A. 1° Celsius B. 1° Fahrenheit C. 4° Kelvin D. 4° Celsius 4° Kelvin
What type of magnet is used with most systems currently manufactured? A. Permanent B. Superconducting C. Resistive D. Upright Superconducting
Transmit gain is a quality measure evaluating for? A. Geometric accuracy -- Z gradient B. Geometric accuracy -- X/Y gradients C. High contrast spatial resolution D. Low contrast spatial resolution E. Accuracy of flip angles Accuracy of flip angles
During a quench of the MR system, patients and employees should be evacuated from the scan room to avoid ______________. A. Damage to tympanic membranes B. Frostbite C. Asphyxiation D. All of the above All of the above
: Doubling the magnetic field strength will: A. Increase the SNR factor by half B. Decrease the SNR factor by half C. Yield an increase of double the SNR D. Yield a decrease of double the SNR Yield an increase of double the SNR
The array processor is responsible for: A. Shimming the magnetic field B. Reconstructing the images using the Fourier transform C. Increasing scan speed using parallel coil elements D. Calculating Field of View measurements inside surface coils Reconstructing the images using the Fourier transform
Consistent room temperature of 65-75°F, humidity of 50-70%, sufficient air flow in the scan room is recommended to: Make patients less vulnerable to the RF heating effects
In order for energy to be efficiently transferred between a transmitter and receiver, the two must be at the same: A. Charge B. Frequency C. Spin density D. Eye level Frequency
The local RF coil used to image a human brain is typically located/kept in the __________. A. Equipment room B. Scan control room C. Magnet room D. Patient waiting room Magnet room
High field scanners typically have field strengths greater than or equal to: A. 0.3 Tesla B. 0.7 Tesla C. 1.5 Tesla D. 5 Gauss 1.5 Tesla
The patient image display with sequence parameter visualization is located in the _________. A. Equipment room B. Scan control room C. Magnet room D. Green room Scan control room
Referring to SAR impact on the patient, all of the following parameter changes negatively impact pulse duty cycle EXCEPT: A. Presaturation slab employment B. Reduction in # slices C. Decreased TR D. Fat suppression selection E. Increased ETL Reduction in # slices
In a cross sectional view of the MR magnet design, which coils are closest to the patient? A. Active shim coils B. Passive shim coils C. Gradient coils D. Radiofrequency coils Radiofrequency coils
Which of the following is NOT a magnetic field associated with MR imaging? A. Static magnetic fields B. Oscillating magnetic fields (RF) C. Time varying magnetic fields (gradient) D. Gravitational earth magnetic fields Gravitational earth magnetic fields
The coil construction in an MR system, from the innermost aspect to the outer: Radiofrequency coils, gradient coils, shim coils, main magnet
The duty cycle can be viewed as the: A. MRI technologist job description B. coil acceleration factor C. active gradient time D. measure of flip angle accuracy active gradient time
The intensity limit for a static magnetic field in clinical use is limited by the Food and Drug Administration (FDA) to _____________? A. 1 Tesla B. 3 Tesla C. 4 Tesla D. 7 Tesla 4 Tesla
The purpose of shimming the magnet is to: A. make the B0 field as homogenous as possible B. make the B1 field as homogenous as possible C. make the scan time as short as possible D. correct for gradient slopes make the B0 field as homogenous as possible
Field strength at magnet isocenter is measured in units of: A. Ohm B. Volts C. Gauss D. Tesla Tesla
Doubling field strength will result in what impact on SAR potential, if any? A. Half-SAR B. No change C. Double SAR D. Quadruple SAR Quadruple SAR
The CPU used to plot and adjust slices in an MR sequence is located: A. Equipment room B. Scan control room C. Magnet room D. Patient waiting room Scan control room
: The liquid cryogens most often used to maintain field strength in a super conducting MR system are: A. Helium B. Gadolinium C. Hydrogen D. Molybdenum Helium
Created by: taylosam3
 

 



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