A Review Quiz On Magnetic Resonance Imaging!

43 Questions | By Athelco | Last updated: Sep 15, 2020 | Total Attempts: 4177

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Here we bring you a review quiz on magnetic resonance imaging! There are different ways that we can get to diagnose a patient's issue, and one of them is looking at the internal organs of a person to identify any anomalies. This is why knowledge and understanding of magnetic resonance imaging readings are important. Take up the quiz below and get to see just how much you know about MRI`s. All the best!

Questions and Answers

1.

These substances exhibit a very slight negative or repelling effect when placed in externally applied magnetic field. They have low and negative susceptibility.
- A.
  
  Diamagnetic
- B.
  
  Paramagnetic
- C.
  
  Superparamagnetic
- D.
  
  Ferromagnetic
2.

Substances that exhibit a slight increase in the magnetic field when placed in an externally applied magnetic field. They have low and positive susceptibility.
- A.
  
  Diamagnetic
- B.
  
  Paramagnetic
- C.
  
  Superpapmagnetic
- D.
  
  Ferromagnetic
3.

Gadilinium is an example of a _ substance
- A.
  
  Diamagnetic
- B.
  
  Paramagnetic
- C.
  
  Superparamagnetic
- D.
  
  Ferromagnetic
4.

These substances exhibit positive suseptibility, but when placed in an external magnetic field they will remain magnetized when external magnetic field is removed
- A.
  
  Diamagnetic
- B.
  
  Paramagnetic
- C.
  
  Superparamagnetic
- D.
  
  Ferromagnetic
5.

These substances exhibit positive suseptibility , are stronger than paramagnetic substances, but are weaker than ferromagnetic substances, and are used as T2 contrast agents
- A.
  
  Diamagnetic
- B.
  
  Paramagnetic
- C.
  
  Superparamagnetic
- D.
  
  Ferromagnetic
6.

10000 gauss = _ Tesla
- A.
  
  5000T
- B.
  
  1 T
- C.
  
  15000T
- D.
  
  None
7.

Magnets made of blocks or slabs or naturally occurring ferrous material.
- A.
  
  Reistive
- B.
  
  Permanent
- C.
  
  Superconducting
- D.
  
  Selenoid
8.

Permanent magnets have field strengths of
- A.
  
  0.5 - 1 T
- B.
  
  0.06 -0.35T
- C.
  
  1-3 T
- D.
  
  Up to 10 T
9.

Wires are aligned side by side to create magnet field
- A.
  
  Permanent magnet
- B.
  
  Resistive magnet
- C.
  
  Selenoid magnet
- D.
  
  Superconducting
10.

This magnet can be used in horizontal or vertical field system, and have strengths up to 0.3 T, and can be turned off.
11.

Magnets that utilize direct current applied to a coil of wire, and are submerged in liquid helium or cryogen to cool the wires.
12.

The majority of superconducting magnets are __ in design and exhibit a (horizontal or vertical) magnetiic field.
13.

Superconductive magnets are limited to _ T in clinical MRI by the FDA.
14.

This type magnetic shielding uses metal, usually steel, in the scan room walls to contain the fringe field
- A.
  
  Passive
- B.
  
  Active
15.

This type of magnetic shielding uses other magnets and their associated magnetic field to confine the field of the main magnet
- A.
  
  Passive
- B.
  
  Active
16.

These coils utilize additional loops and circiutry to improve the efficiency with which the MR signal is induced in the coil, and increase SNR approximately 40% over the coil of the same size.
- A.
  
  Quadrature
- B.
  
  Vertical
- C.
  
  Helmholtz pair
- D.
  
  Phased array
17.

Require the use of solenoid coils due to the orientation of the B0, more effiecient than linear coil, and can be combine with other coils electronically to improve signal uniformity through a region of interest.
- A.
  
  Quadrature
- B.
  
  Vertical
- C.
  
  Helmholtz pair
- D.
  
  Phased array
18.

Allow for increased area of coverage without the reduction in SNR, have multiple coils and receivers.
- A.
  
  Quadrature
- B.
  
  Vertical
- C.
  
  Helmholtz pair
- D.
  
  Phase array
19.

A narrow bandwidth allows for _slices
- A.
  
  Thicker
- B.
  
  Thinner
20.

The slice location is determined by the
- A.
  
  Phase gradient
- B.
  
  Transmit frequency of the rf coil
- C.
  
  Receiver frequency of the rf pulse
- D.
  
  Transmit frequency of the rf pul
21.

The receiver gandwidth represents the range of frequencies sampled during the
- A.
  
  Phase gradient
- B.
  
  Slice selection gradient
- C.
  
  Frequency encoding gradient
- D.
  
  Gradient coils
22.

The receiver bandwidth is determined by the number of
- A.
  
  Phase steps in the martrix
- B.
  
  Frequency samples in the matrix
23.

If 256 frequency samples are collected and the readout or sampling period is 8 ms, the receiver bandwidth would be

Discuss
24.

The main purpose of the gradient subsystem is to
- A.
  
  Select the slice plane
- B.
  
  Select the imaging plance
- C.
  
  Spatially encode the MR signal
- D.
  
  All of the above
25.

This gradient coil varies the intensity of the magnetic field in the head to foot direction
- A.
  
  X
- B.
  
  Y
- C.
  
  Z