4404368
Pregunta 1
Pregunta
Which of the following is an advantage of a permanent magnet MRI system
Respuesta
-
Very heavy
-
Low operating costs
-
Fixed field strength
-
Limited field strength
Pregunta 2
Pregunta
Which of the following types of MRI magnet is known as the Classical electromagnet
Respuesta
-
Resistive magnet
-
Superconducting magnet
-
Permanent magnet
-
Distractive magnet
Pregunta 3
Pregunta
Which of the following is a disadvantage of a resistive magnet MRI system
Respuesta
-
Easy coil maintenance
-
Low cost
-
High power consumption
-
None of the above
Pregunta 4
Pregunta
The type of MRI magnet that is produced by cooling a current down to 4 degrees Kelvin is known as a
Respuesta
-
Distractive magnet
-
Permanent magnet
-
Resistive magnet
-
Superconducting magnet
Pregunta 5
Pregunta
The type of MRI magnet that allows the highest field strengths is a
Respuesta
-
Resistive magnet
-
Superconducting magnet
-
Iron core magnet
-
Permanent magnet
Pregunta 6
Pregunta
Coils used to correct imperfections in the magnetic field are known as
Respuesta
-
RF coils
-
Surface coils
-
Gradient coils
-
Shim coils
Pregunta 7
Pregunta
The type of magnet that is produced by permanently magnetizing a ferromagnetic substance is known as a
Respuesta
-
Resistive magnet
-
Electromagnet
-
Superconducting magnet
-
Permanent magnet
Pregunta 8
Pregunta
In clinical MRI, permanent magnets can be produced to operate up to what field strength
Respuesta
-
0.3 tesla
-
0.5 tesla
-
1.0 tesla
-
1.5 tesla
Pregunta 9
Pregunta
Which of the following is a disadvantage of using a permanent magnet in clinical MRI
Respuesta
-
Low fringe field
-
Low operating cost
-
Low field strength
-
Low fringe field & Low field strength
Pregunta 10
Pregunta
Which of the following materials is most commonly used to produce a permanent magnet
Respuesta
-
Niobium-Titanium alloy
-
Copper-Gadolinium alloy
-
Aluminum-Nickel-Cobalt alloy
-
Iron
Pregunta 11
Pregunta
The type of magnet that is produced by passing an electrical current through a conductor is known as a
Respuesta
-
Permanent magnet
-
Resistive magnet
-
Electromagnet
-
Resistive magnet & Electromagnet
Pregunta 12
Pregunta
The rule that is used to determine the direction of the magnetic field in an electromagnet is known as
Respuesta
-
Ohm's Law
-
Right hand thumb rule
-
Left hand thumb rule
-
None of the above
Pregunta 13
Pregunta
In clinical MRI, resistive magnets usually operate at what field strength
Respuesta
-
Between 0.15 - 0.25 tesla
-
Between 0.5 - 1.5 tesla
-
Between 1.5 - 2 tesla
-
Over 2 tesla
Pregunta 14
Pregunta
Which of the following is an advantage of using a resistive magnet for clinical MRI
Respuesta
-
High power consumption
-
Low capital cost
-
Low field strength
-
None of the above
Pregunta 15
Pregunta
The law that is used to determine the amount of resistance in a conductor is known as
Respuesta
-
Newton's Law
-
Ohm's Law
-
Faraday's Law
-
Murphy's Law
Pregunta 16
Pregunta
The type o f magnet that is produced by removing resistance from a conductive wire is known as
Respuesta
-
Resistive magnet
-
Reactive magnet
-
Permanent magnet
-
Superconducting magnet
Pregunta 17
Pregunta
The wire used to create the main magnetic field in a superconducting magnet is known as
Respuesta
-
Aluminum-Tiobium
-
Iron sulfite
-
Copper-tungsten
-
Niobium-Titanium
Pregunta 18
Pregunta
The external magnetic field in a superconducting magnet is said to be what type of magnetic field
Respuesta
-
Static
-
Kinetic
-
Gradient
-
Resistive
Pregunta 19
Pregunta
The wire used in the main magnetic field of a superconducting magnet has its resistance removed by cooling it to a temperature of
Respuesta
-
-452 degrees Fahrenheit
-
0 degrees Celsius
-
269 degrees Kelvin
-
None of the above
Pregunta 20
Pregunta
The liquids used to cool the wire in the main magnetic field of a superconducting magnet are known as
Respuesta
-
Neon gases
-
Plasma
-
Cryogens
-
None of the above
Pregunta 21
Pregunta
The specific liquids used to maintain low temperatures in the superconducting wire are
Respuesta
-
Titanium and Niobium
-
Hydrogen and Neon
-
Halon and Oxygen
-
Helium and Nitrogen
Pregunta 22
Pregunta
The device used to store and transport cryogenic liquids is known as a
Respuesta
-
Thermos
-
Dewar
-
Barrel
-
None of the above
Pregunta 23
Pregunta
In a superconducting magnet, the sudden loss of superconductivity is known as a
Respuesta
-
Squelch
-
Slouch
-
Screech
-
Quench
Pregunta 24
Pregunta
In an MRI system, the magnetic field that extends outside the bore of the magnet is known as the
Respuesta
-
Extended field
-
Outer field
-
Fringe field
-
In field
Pregunta 25
Pregunta
In clinical MRI, superconducting magnets usually operate at field strengths from
Respuesta
-
0.15 to 0.3 tesla
-
0.5 to 2.0 tesla
-
2.5 to 4.0 tesla
-
Over 4 tesla
Pregunta 26
Pregunta
In clinical MRI, which of the following is an advantage of using a superconducting magnet
Respuesta
-
High field strength
-
Shorter scan times
-
Low power consumption
-
All of the above
Pregunta 27
Pregunta
In clinical MRI, which of the following is a disadvantage of using a superconducting magnet
Respuesta
-
High capital costs
-
High fringe field
-
High cryogenic costs
-
All of the above
Pregunta 28
Pregunta
The method used to contain the main magnetic field within the scan room is known as
Respuesta
-
Shimming
-
Shielding
-
Fringing
-
None of the above
Pregunta 29
Pregunta
The method of MRI field containment that uses steel lining in the walls of the magnetic room is known as
Respuesta
-
Active shimming
-
Passive shielding
-
Active shielding
-
Passive shimming
Pregunta 30
Pregunta
The method of MRI field containment that uses additional magnets outside the cryogenic area of the magnet is known as
Respuesta
-
Active shimming
-
Passive shielding
-
Active shielding
-
Passive shimming
Pregunta 31
Pregunta
The process of adjusting coils to improve the homogeneity of the external magnetic field is known as
Respuesta
-
Strengthening
-
Fringing
-
Shielding
-
Shimming
Pregunta 32
Pregunta
Each shim coil requires its own power supply
Respuesta
-
True
-
False
Pregunta 33
Pregunta
The type of shimming that is achieved by placing a ferrous material around the main magnet is known as
Respuesta
-
Passive shimming
-
Passive shielding
-
Active shimming
-
Active shielding
Pregunta 34
Pregunta
The type of shimming that is achieved by adjusting the electrical current in specialized coils is known as
Respuesta
-
Passive shimming
-
Passive shielding
-
Active shimming
-
Active shielding
Pregunta 35
Pregunta
The homogeneity of the external magnetic field is measured in what type of unit
Respuesta
-
Tesla per cm
-
Part per million (ppm)
-
Gauss per meter
-
Megahertz
Pregunta 36
Pregunta
In clinical MRI, the homogeneity of the magnet should be at least
Respuesta
-
1 tesla per cm
-
10 parts per million
-
0.5 gauss per meter
-
32 magahertz
Pregunta 37
Pregunta
The type of coils used to change the strength of the magnetic field inside the bore of the magnet are known as
Respuesta
-
RF coils
-
Shim coils
-
Surface coils
-
Gradient coils
Pregunta 38
Pregunta
In a gradient coil, the amplitude of the gradient slope is determined by what factor
Respuesta
-
The amount of current passing through the coil
-
Transmit bandwidth
-
The strength of the external magnetic field
-
None of the above
Pregunta 39
Pregunta
How many gradient coils are there in a clinical MRI system
Respuesta
-
1 pair
-
2 pairs
-
3 pairs
-
4 pairs
Pregunta 40
Pregunta
Gradient strength is measured in what form of unit
Respuesta
-
Megahertz
-
Gauss per centimeter
-
Militesla per meter
-
Gauss per centimeter & Militesla per meter
Pregunta 41
Pregunta
The time it takes for a gradient coil to reach its peak strength is known as
its
Respuesta
-
Repetition time
-
Echo time
-
Rise time
-
Inversion time
Pregunta 42
Pregunta
Coils that are used to transmit and receive radio frequencies are known as
Respuesta
-
RF coils
-
Shim coils
-
Gradient coils
-
Surface coils
Pregunta 43
Pregunta
The type of RF coil that encompasses the entire anatomy to be scanned is known as
Respuesta
-
Surface coil
-
Phased array coil
-
Volume coil
-
Gradient coil
Pregunta 44
Pregunta
The type of RF coil configuration that uses a pair of coils perpendicular to each other to transmit and receive signal is known as a
Respuesta
-
Surface coil
-
Phased array coil
-
Quadrature coil
-
Shim coil
Pregunta 45
Pregunta
The type of RF coil configuration that uses a series of independent coils to create one image is known as a
Respuesta
-
Surface coil
-
Phased array coil
-
Quadrature coil
-
Gradient coil
Pregunta 46
Pregunta
The type of RF coil configuration that is used to image anatomical structures close to the surface of the patient is known as a
Respuesta
-
Surface coil
-
Quadrature coil
-
Phased array coil
-
Shim coil
Pregunta 47
Pregunta
Mutual induction between the RF transmitter and the RF receiver is known
as
Respuesta
-
Isolation
-
Deisolation
-
Coupling
-
Decoupling
Pregunta 48
Pregunta
Isolating the RF transmitter from the RF receiver is known as
Respuesta
-
Deisolation
-
Isolation
-
Coupling
-
Decoupling
Pregunta 49
Pregunta
The computer that performs the complex calculations necessary to reconstruct MRI images is known as the
Respuesta
-
Array processor
-
RF amplifier
-
Gradient amplifier
-
Shim cabinet
Pregunta 50
Pregunta
The device in the MRI system that supplies power to the gradient coils is known as the
Respuesta
-
Array processor
-
RF amplifier
-
Gradient amplifier
-
None of the above
Pregunta 51
Pregunta
The device in the MRI system that supplies power to the RF transmitter coils is known as the
Respuesta
-
Array processor
-
RF amplifier
-
Gradient amplifier
-
None of the above
Pregunta 52
Pregunta
Prior to each scan, the process of prescanning performs which type of calibration
Respuesta
-
Adjusts the transmit gain
-
Adjusts the receive attenuation
-
Sets the center frequency
-
All of the above
Pregunta 53
Pregunta
The calibration of transmit gain during the prescan process determines which factor
Respuesta
-
RF output necessary to produce a 90 degree flip angle
-
The exact resonant frequency
-
The necessary amount of signal needed to create an image
-
None of the above
Pregunta 54
Pregunta
The process during the prescan that determines the amount of signal that is received is known as
Respuesta
-
Center frequency adjustment
-
Transmit gain adjustment
-
Receive attenuation adjustment
-
Impedance matching
Pregunta 55
Pregunta
The process during prescan that fine tunes the resonant frequency is known
as
Respuesta
-
Center frequency adjustment
-
Transmit gain adjustment
-
Receive attenuation adjustment
-
Impedance matching
Pregunta 56
Pregunta
How many miliseconds are there in a minute
Respuesta
-
60
-
600
-
6,000
-
60,000
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