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Practice Set (8) - Instrumentation

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Diploma MR Quiz on Practice Set (8) - Instrumentation, created by S L on 31/01/2016.
S L
Quiz by S L, updated more than 1 year ago
S L
Created by S L almost 9 years ago
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Resource summary

Question 1

Question
Which of the following is an advantage of a permanent magnet MRI system
Answer
  • Very heavy
  • Low operating costs
  • Fixed field strength
  • Limited field strength

Question 2

Question
Which of the following types of MRI magnet is known as the Classical electromagnet
Answer
  • Resistive magnet
  • Superconducting magnet
  • Permanent magnet
  • Distractive magnet

Question 3

Question
Which of the following is a disadvantage of a resistive magnet MRI system
Answer
  • Easy coil maintenance
  • Low cost
  • High power consumption
  • None of the above

Question 4

Question
The type of MRI magnet that is produced by cooling a current down to 4 degrees Kelvin is known as a
Answer
  • Distractive magnet
  • Permanent magnet
  • Resistive magnet
  • Superconducting magnet

Question 5

Question
The type of MRI magnet that allows the highest field strengths is a
Answer
  • Resistive magnet
  • Superconducting magnet
  • Iron core magnet
  • Permanent magnet

Question 6

Question
Coils used to correct imperfections in the magnetic field are known as
Answer
  • RF coils
  • Surface coils
  • Gradient coils
  • Shim coils

Question 7

Question
The type of magnet that is produced by permanently magnetizing a ferromagnetic substance is known as a
Answer
  • Resistive magnet
  • Electromagnet
  • Superconducting magnet
  • Permanent magnet

Question 8

Question
In clinical MRI, permanent magnets can be produced to operate up to what field strength
Answer
  • 0.3 tesla
  • 0.5 tesla
  • 1.0 tesla
  • 1.5 tesla

Question 9

Question
Which of the following is a disadvantage of using a permanent magnet in clinical MRI
Answer
  • Low fringe field
  • Low operating cost
  • Low field strength
  • Low fringe field & Low field strength

Question 10

Question
Which of the following materials is most commonly used to produce a permanent magnet
Answer
  • Niobium-Titanium alloy
  • Copper-Gadolinium alloy
  • Aluminum-Nickel-Cobalt alloy
  • Iron

Question 11

Question
The type of magnet that is produced by passing an electrical current through a conductor is known as a
Answer
  • Permanent magnet
  • Resistive magnet
  • Electromagnet
  • Resistive magnet & Electromagnet

Question 12

Question
The rule that is used to determine the direction of the magnetic field in an electromagnet is known as
Answer
  • Ohm's Law
  • Right hand thumb rule
  • Left hand thumb rule
  • None of the above

Question 13

Question
In clinical MRI, resistive magnets usually operate at what field strength
Answer
  • Between 0.15 - 0.25 tesla
  • Between 0.5 - 1.5 tesla
  • Between 1.5 - 2 tesla
  • Over 2 tesla

Question 14

Question
Which of the following is an advantage of using a resistive magnet for clinical MRI
Answer
  • High power consumption
  • Low capital cost
  • Low field strength
  • None of the above

Question 15

Question
The law that is used to determine the amount of resistance in a conductor is known as
Answer
  • Newton's Law
  • Ohm's Law
  • Faraday's Law
  • Murphy's Law

Question 16

Question
The type o f magnet that is produced by removing resistance from a conductive wire is known as
Answer
  • Resistive magnet
  • Reactive magnet
  • Permanent magnet
  • Superconducting magnet

Question 17

Question
The wire used to create the main magnetic field in a superconducting magnet is known as
Answer
  • Aluminum-Tiobium
  • Iron sulfite
  • Copper-tungsten
  • Niobium-Titanium

Question 18

Question
The external magnetic field in a superconducting magnet is said to be what type of magnetic field
Answer
  • Static
  • Kinetic
  • Gradient
  • Resistive

Question 19

Question
The wire used in the main magnetic field of a superconducting magnet has its resistance removed by cooling it to a temperature of
Answer
  • -452 degrees Fahrenheit
  • 0 degrees Celsius
  • 269 degrees Kelvin
  • None of the above

Question 20

Question
The liquids used to cool the wire in the main magnetic field of a superconducting magnet are known as
Answer
  • Neon gases
  • Plasma
  • Cryogens
  • None of the above

Question 21

Question
The specific liquids used to maintain low temperatures in the superconducting wire are
Answer
  • Titanium and Niobium
  • Hydrogen and Neon
  • Halon and Oxygen
  • Helium and Nitrogen

Question 22

Question
The device used to store and transport cryogenic liquids is known as a
Answer
  • Thermos
  • Dewar
  • Barrel
  • None of the above

Question 23

Question
In a superconducting magnet, the sudden loss of superconductivity is known as a
Answer
  • Squelch
  • Slouch
  • Screech
  • Quench

Question 24

Question
In an MRI system, the magnetic field that extends outside the bore of the magnet is known as the
Answer
  • Extended field
  • Outer field
  • Fringe field
  • In field

Question 25

Question
In clinical MRI, superconducting magnets usually operate at field strengths from
Answer
  • 0.15 to 0.3 tesla
  • 0.5 to 2.0 tesla
  • 2.5 to 4.0 tesla
  • Over 4 tesla

Question 26

Question
In clinical MRI, which of the following is an advantage of using a superconducting magnet
Answer
  • High field strength
  • Shorter scan times
  • Low power consumption
  • All of the above

Question 27

Question
In clinical MRI, which of the following is a disadvantage of using a superconducting magnet
Answer
  • High capital costs
  • High fringe field
  • High cryogenic costs
  • All of the above

Question 28

Question
The method used to contain the main magnetic field within the scan room is known as
Answer
  • Shimming
  • Shielding
  • Fringing
  • None of the above

Question 29

Question
The method of MRI field containment that uses steel lining in the walls of the magnetic room is known as
Answer
  • Active shimming
  • Passive shielding
  • Active shielding
  • Passive shimming

Question 30

Question
The method of MRI field containment that uses additional magnets outside the cryogenic area of the magnet is known as
Answer
  • Active shimming
  • Passive shielding
  • Active shielding
  • Passive shimming

Question 31

Question
The process of adjusting coils to improve the homogeneity of the external magnetic field is known as
Answer
  • Strengthening
  • Fringing
  • Shielding
  • Shimming

Question 32

Question
Each shim coil requires its own power supply
Answer
  • True
  • False

Question 33

Question
The type of shimming that is achieved by placing a ferrous material around the main magnet is known as
Answer
  • Passive shimming
  • Passive shielding
  • Active shimming
  • Active shielding

Question 34

Question
The type of shimming that is achieved by adjusting the electrical current in specialized coils is known as
Answer
  • Passive shimming
  • Passive shielding
  • Active shimming
  • Active shielding

Question 35

Question
The homogeneity of the external magnetic field is measured in what type of unit
Answer
  • Tesla per cm
  • Part per million (ppm)
  • Gauss per meter
  • Megahertz

Question 36

Question
In clinical MRI, the homogeneity of the magnet should be at least
Answer
  • 1 tesla per cm
  • 10 parts per million
  • 0.5 gauss per meter
  • 32 magahertz

Question 37

Question
The type of coils used to change the strength of the magnetic field inside the bore of the magnet are known as
Answer
  • RF coils
  • Shim coils
  • Surface coils
  • Gradient coils

Question 38

Question
In a gradient coil, the amplitude of the gradient slope is determined by what factor
Answer
  • The amount of current passing through the coil
  • Transmit bandwidth
  • The strength of the external magnetic field
  • None of the above

Question 39

Question
How many gradient coils are there in a clinical MRI system
Answer
  • 1 pair
  • 2 pairs
  • 3 pairs
  • 4 pairs

Question 40

Question
Gradient strength is measured in what form of unit
Answer
  • Megahertz
  • Gauss per centimeter
  • Militesla per meter
  • Gauss per centimeter & Militesla per meter

Question 41

Question
The time it takes for a gradient coil to reach its peak strength is known as its
Answer
  • Repetition time
  • Echo time
  • Rise time
  • Inversion time

Question 42

Question
Coils that are used to transmit and receive radio frequencies are known as
Answer
  • RF coils
  • Shim coils
  • Gradient coils
  • Surface coils

Question 43

Question
The type of RF coil that encompasses the entire anatomy to be scanned is known as
Answer
  • Surface coil
  • Phased array coil
  • Volume coil
  • Gradient coil

Question 44

Question
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
Answer
  • Surface coil
  • Phased array coil
  • Quadrature coil
  • Shim coil

Question 45

Question
The type of RF coil configuration that uses a series of independent coils to create one image is known as a
Answer
  • Surface coil
  • Phased array coil
  • Quadrature coil
  • Gradient coil

Question 46

Question
The type of RF coil configuration that is used to image anatomical structures close to the surface of the patient is known as a
Answer
  • Surface coil
  • Quadrature coil
  • Phased array coil
  • Shim coil

Question 47

Question
Mutual induction between the RF transmitter and the RF receiver is known as
Answer
  • Isolation
  • Deisolation
  • Coupling
  • Decoupling

Question 48

Question
Isolating the RF transmitter from the RF receiver is known as
Answer
  • Deisolation
  • Isolation
  • Coupling
  • Decoupling

Question 49

Question
The computer that performs the complex calculations necessary to reconstruct MRI images is known as the
Answer
  • Array processor
  • RF amplifier
  • Gradient amplifier
  • Shim cabinet

Question 50

Question
The device in the MRI system that supplies power to the gradient coils is known as the
Answer
  • Array processor
  • RF amplifier
  • Gradient amplifier
  • None of the above

Question 51

Question
The device in the MRI system that supplies power to the RF transmitter coils is known as the
Answer
  • Array processor
  • RF amplifier
  • Gradient amplifier
  • None of the above

Question 52

Question
Prior to each scan, the process of prescanning performs which type of calibration
Answer
  • Adjusts the transmit gain
  • Adjusts the receive attenuation
  • Sets the center frequency
  • All of the above

Question 53

Question
The calibration of transmit gain during the prescan process determines which factor
Answer
  • 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

Question 54

Question
The process during the prescan that determines the amount of signal that is received is known as
Answer
  • Center frequency adjustment
  • Transmit gain adjustment
  • Receive attenuation adjustment
  • Impedance matching

Question 55

Question
The process during prescan that fine tunes the resonant frequency is known as
Answer
  • Center frequency adjustment
  • Transmit gain adjustment
  • Receive attenuation adjustment
  • Impedance matching

Question 56

Question
How many miliseconds are there in a minute
Answer
  • 60
  • 600
  • 6,000
  • 60,000
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