Practice Set (8) - Instrumentation

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Each shim coil requires its own power supply

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

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

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

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

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

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

How many gradient coils are there in a clinical MRI system

Gradient strength is measured in what form of unit

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

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

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

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

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

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

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

Isolating the RF transmitter from the RF receiver is known as

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

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

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

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

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

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

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

How many miliseconds are there in a minute