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Diploma MR Quiz on Practice Set (8) - Instrumentation, created by S L on 31/01/2016.

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Practice Set (8) - Instrumentation

Question 1 of 56

1

Which of the following is an advantage of a permanent magnet MRI system

Select one of the following:

  • Very heavy

  • Low operating costs

  • Fixed field strength

  • Limited field strength

Explanation

Question 2 of 56

1

Which of the following types of MRI magnet is known as the Classical electromagnet

Select one of the following:

  • Resistive magnet

  • Superconducting magnet

  • Permanent magnet

  • Distractive magnet

Explanation

Question 3 of 56

1

Which of the following is a disadvantage of a resistive magnet MRI system

Select one of the following:

  • Easy coil maintenance

  • Low cost

  • High power consumption

  • None of the above

Explanation

Question 4 of 56

1

The type of MRI magnet that is produced by cooling a current down to 4 degrees Kelvin is known as a

Select one of the following:

  • Distractive magnet

  • Permanent magnet

  • Resistive magnet

  • Superconducting magnet

Explanation

Question 5 of 56

1

The type of MRI magnet that allows the highest field strengths is a

Select one of the following:

  • Resistive magnet

  • Superconducting magnet

  • Iron core magnet

  • Permanent magnet

Explanation

Question 6 of 56

1

Coils used to correct imperfections in the magnetic field are known as

Select one of the following:

  • RF coils

  • Surface coils

  • Gradient coils

  • Shim coils

Explanation

Question 7 of 56

1

The type of magnet that is produced by permanently magnetizing a ferromagnetic substance is known as a

Select one of the following:

  • Resistive magnet

  • Electromagnet

  • Superconducting magnet

  • Permanent magnet

Explanation

Question 8 of 56

1

In clinical MRI, permanent magnets can be produced to operate up to what field strength

Select one of the following:

  • 0.3 tesla

  • 0.5 tesla

  • 1.0 tesla

  • 1.5 tesla

Explanation

Question 9 of 56

1

Which of the following is a disadvantage of using a permanent magnet in clinical MRI

Select one of the following:

  • Low fringe field

  • Low operating cost

  • Low field strength

  • Low fringe field & Low field strength

Explanation

Question 10 of 56

1

Which of the following materials is most commonly used to produce a permanent magnet

Select one of the following:

  • Niobium-Titanium alloy

  • Copper-Gadolinium alloy

  • Aluminum-Nickel-Cobalt alloy

  • Iron

Explanation

Question 11 of 56

1

The type of magnet that is produced by passing an electrical current through a conductor is known as a

Select one of the following:

  • Permanent magnet

  • Resistive magnet

  • Electromagnet

  • Resistive magnet & Electromagnet

Explanation

Question 12 of 56

1

The rule that is used to determine the direction of the magnetic field in an electromagnet is known as

Select one of the following:

  • Ohm's Law

  • Right hand thumb rule

  • Left hand thumb rule

  • None of the above

Explanation

Question 13 of 56

1

In clinical MRI, resistive magnets usually operate at what field strength

Select one of the following:

  • Between 0.15 - 0.25 tesla

  • Between 0.5 - 1.5 tesla

  • Between 1.5 - 2 tesla

  • Over 2 tesla

Explanation

Question 14 of 56

1

Which of the following is an advantage of using a resistive magnet for clinical MRI

Select one of the following:

  • High power consumption

  • Low capital cost

  • Low field strength

  • None of the above

Explanation

Question 15 of 56

1

The law that is used to determine the amount of resistance in a conductor is known as

Select one of the following:

  • Newton's Law

  • Ohm's Law

  • Faraday's Law

  • Murphy's Law

Explanation

Question 16 of 56

1

The type o f magnet that is produced by removing resistance from a conductive wire is known as

Select one of the following:

  • Resistive magnet

  • Reactive magnet

  • Permanent magnet

  • Superconducting magnet

Explanation

Question 17 of 56

1

The wire used to create the main magnetic field in a superconducting magnet is known as

Select one of the following:

  • Aluminum-Tiobium

  • Iron sulfite

  • Copper-tungsten

  • Niobium-Titanium

Explanation

Question 18 of 56

1

The external magnetic field in a superconducting magnet is said to be what type of magnetic field

Select one of the following:

  • Static

  • Kinetic

  • Gradient

  • Resistive

Explanation

Question 19 of 56

1

The wire used in the main magnetic field of a superconducting magnet has its resistance removed by cooling it to a temperature of

Select one of the following:

  • -452 degrees Fahrenheit

  • 0 degrees Celsius

  • 269 degrees Kelvin

  • None of the above

Explanation

Question 20 of 56

1

The liquids used to cool the wire in the main magnetic field of a superconducting magnet are known as

Select one of the following:

  • Neon gases

  • Plasma

  • Cryogens

  • None of the above

Explanation

Question 21 of 56

1

The specific liquids used to maintain low temperatures in the superconducting wire are

Select one of the following:

  • Titanium and Niobium

  • Hydrogen and Neon

  • Halon and Oxygen

  • Helium and Nitrogen

Explanation

Question 22 of 56

1

The device used to store and transport cryogenic liquids is known as a

Select one of the following:

  • Thermos

  • Dewar

  • Barrel

  • None of the above

Explanation

Question 23 of 56

1

In a superconducting magnet, the sudden loss of superconductivity is known as a

Select one of the following:

  • Squelch

  • Slouch

  • Screech

  • Quench

Explanation

Question 24 of 56

1

In an MRI system, the magnetic field that extends outside the bore of the magnet is known as the

Select one of the following:

  • Extended field

  • Outer field

  • Fringe field

  • In field

Explanation

Question 25 of 56

1

In clinical MRI, superconducting magnets usually operate at field strengths from

Select one of the following:

  • 0.15 to 0.3 tesla

  • 0.5 to 2.0 tesla

  • 2.5 to 4.0 tesla

  • Over 4 tesla

Explanation

Question 26 of 56

1

In clinical MRI, which of the following is an advantage of using a superconducting magnet

Select one of the following:

  • High field strength

  • Shorter scan times

  • Low power consumption

  • All of the above

Explanation

Question 27 of 56

1

In clinical MRI, which of the following is a disadvantage of using a superconducting magnet

Select one of the following:

  • High capital costs

  • High fringe field

  • High cryogenic costs

  • All of the above

Explanation

Question 28 of 56

1

The method used to contain the main magnetic field within the scan room is known as

Select one of the following:

  • Shimming

  • Shielding

  • Fringing

  • None of the above

Explanation

Question 29 of 56

1

The method of MRI field containment that uses steel lining in the walls of the magnetic room is known as

Select one of the following:

  • Active shimming

  • Passive shielding

  • Active shielding

  • Passive shimming

Explanation

Question 30 of 56

1

The method of MRI field containment that uses additional magnets outside the cryogenic area of the magnet is known as

Select one of the following:

  • Active shimming

  • Passive shielding

  • Active shielding

  • Passive shimming

Explanation

Question 31 of 56

1

The process of adjusting coils to improve the homogeneity of the external magnetic field is known as

Select one of the following:

  • Strengthening

  • Fringing

  • Shielding

  • Shimming

Explanation

Question 32 of 56

1

Each shim coil requires its own power supply

Select one of the following:

  • True

  • False

Explanation

Question 33 of 56

1

The type of shimming that is achieved by placing a ferrous material around the main magnet is known as

Select one of the following:

  • Passive shimming

  • Passive shielding

  • Active shimming

  • Active shielding

Explanation

Question 34 of 56

1

The type of shimming that is achieved by adjusting the electrical current in specialized coils is known as

Select one of the following:

  • Passive shimming

  • Passive shielding

  • Active shimming

  • Active shielding

Explanation

Question 35 of 56

1

The homogeneity of the external magnetic field is measured in what type of unit

Select one of the following:

  • Tesla per cm

  • Part per million (ppm)

  • Gauss per meter

  • Megahertz

Explanation

Question 36 of 56

1

In clinical MRI, the homogeneity of the magnet should be at least

Select one of the following:

  • 1 tesla per cm

  • 10 parts per million

  • 0.5 gauss per meter

  • 32 magahertz

Explanation

Question 37 of 56

1

The type of coils used to change the strength of the magnetic field inside the bore of the magnet are known as

Select one of the following:

  • RF coils

  • Shim coils

  • Surface coils

  • Gradient coils

Explanation

Question 38 of 56

1

In a gradient coil, the amplitude of the gradient slope is determined by what factor

Select one of the following:

  • The amount of current passing through the coil

  • Transmit bandwidth

  • The strength of the external magnetic field

  • None of the above

Explanation

Question 39 of 56

1

How many gradient coils are there in a clinical MRI system

Select one of the following:

  • 1 pair

  • 2 pairs

  • 3 pairs

  • 4 pairs

Explanation

Question 40 of 56

1

Gradient strength is measured in what form of unit

Select one of the following:

  • Megahertz

  • Gauss per centimeter

  • Militesla per meter

  • Gauss per centimeter & Militesla per meter

Explanation

Question 41 of 56

1

The time it takes for a gradient coil to reach its peak strength is known as
its

Select one of the following:

  • Repetition time

  • Echo time

  • Rise time

  • Inversion time

Explanation

Question 42 of 56

1

Coils that are used to transmit and receive radio frequencies are known as

Select one of the following:

  • RF coils

  • Shim coils

  • Gradient coils

  • Surface coils

Explanation

Question 43 of 56

1

The type of RF coil that encompasses the entire anatomy to be scanned is known as

Select one of the following:

  • Surface coil

  • Phased array coil

  • Volume coil

  • Gradient coil

Explanation

Question 44 of 56

1

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

Select one of the following:

  • Surface coil

  • Phased array coil

  • Quadrature coil

  • Shim coil

Explanation

Question 45 of 56

1

The type of RF coil configuration that uses a series of independent coils to create one image is known as a

Select one of the following:

  • Surface coil

  • Phased array coil

  • Quadrature coil

  • Gradient coil

Explanation

Question 46 of 56

1

The type of RF coil configuration that is used to image anatomical structures close to the surface of the patient is known as a

Select one of the following:

  • Surface coil

  • Quadrature coil

  • Phased array coil

  • Shim coil

Explanation

Question 47 of 56

1

Mutual induction between the RF transmitter and the RF receiver is known
as

Select one of the following:

  • Isolation

  • Deisolation

  • Coupling

  • Decoupling

Explanation

Question 48 of 56

1

Isolating the RF transmitter from the RF receiver is known as

Select one of the following:

  • Deisolation

  • Isolation

  • Coupling

  • Decoupling

Explanation

Question 49 of 56

1

The computer that performs the complex calculations necessary to reconstruct MRI images is known as the

Select one of the following:

  • Array processor

  • RF amplifier

  • Gradient amplifier

  • Shim cabinet

Explanation

Question 50 of 56

1

The device in the MRI system that supplies power to the gradient coils is known as the

Select one of the following:

  • Array processor

  • RF amplifier

  • Gradient amplifier

  • None of the above

Explanation

Question 51 of 56

1

The device in the MRI system that supplies power to the RF transmitter coils is known as the

Select one of the following:

  • Array processor

  • RF amplifier

  • Gradient amplifier

  • None of the above

Explanation

Question 52 of 56

1

Prior to each scan, the process of prescanning performs which type of calibration

Select one of the following:

  • Adjusts the transmit gain

  • Adjusts the receive attenuation

  • Sets the center frequency

  • All of the above

Explanation

Question 53 of 56

1

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

Select one of the following:

  • 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

Explanation

Question 54 of 56

1

The process during the prescan that determines the amount of signal that is received is known as

Select one of the following:

  • Center frequency adjustment

  • Transmit gain adjustment

  • Receive attenuation adjustment

  • Impedance matching

Explanation

Question 55 of 56

1

The process during prescan that fine tunes the resonant frequency is known
as

Select one of the following:

  • Center frequency adjustment

  • Transmit gain adjustment

  • Receive attenuation adjustment

  • Impedance matching

Explanation

Question 56 of 56

1

How many miliseconds are there in a minute

Select one of the following:

  • 60

  • 600

  • 6,000

  • 60,000

Explanation

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