Forming MR Images

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1/12 Questions

In order for energy to be efficiently transferred between a transmitter and a receiver, the two must be at the same:
- Charge
- Frequency
- Mass
- Energy level

About This Quiz

Quiz reviewing the basics of forming an MR image.

2.

If the field strength experienced by a patient within an MR magnet was increased, the precessional frequency of the magnetization of the patient's protons would be expected to:
- Remain unaffected
- Decreased
- Increase
- Reverse direction
Correct Answer

A. Increase
3.

_ is defined as a small change in the magnetic field along a particular axis.
- A gradient
- Raw data
- Digital
- A fourier tansform
Correct Answer

A. A gradient
4.

If a group of protons moves toward the high end of a gradient the precessional frequency of their magnetization:
- Stays the same
- Increases
- Decreases
- Reverses directions
Correct Answer

A. Increases
5.

The - gradient creates a change in the magnetic field from the patient's left side to the right side1. x2. y3. z
- 1 only
- 1 & 3
- 2 only
- 1 & 2
Correct Answer

A. 1 only
6.

An image creted from a slice perpendicular to the axis running from anterior to posterior in the patient is called?
- Oblique
- Coronal
- Transverse
- Sagittal
Correct Answer

A. Coronal
7.

In MRI, RF energy is
- Transmitted to all body parts in the vicinity of the RF antenna, or coil
- Collimated to strike a thin slice of protons
- Shielded from striking parts of the body which are not being imaged
- Focussed at a specific section of the patient's body
Correct Answer

A. Transmitted to all body parts in the vicinity of the RF antenna, or coil
8.

In order to disturb the protons in a particular location of the body, the frequency of the transmitted RF energy must be:
- Matched to the precessional frequency of the magnetization produced by protons which are exposed to the same magnetic field as the magnetic field of the MR system
- 42.7MHz
- Matched to the precessional frequency of the magnetization of protons at that particular location
- 63.5 MHz
Correct Answer

A. Matched to the precessional frequency of the magnetization of protons at that particular location
9.

If the slice though the patient that we wish to image is in a magnetic field of 0.995 T, the RF energy sould be transmitted at _ MHz.
- 42.85
- 63.9
- 42.39
- 42.6
Correct Answer

A. 42.39
10.

Which of the following is the function of the gradients?
- They are responsible for ensuring that all of the protons in the body simultaneously receive the RF energy
- They provide the energy used to move the net magnetization of the protons into the transverse plane
- They casue the precessional frequency to vary with position
- They stabilize the magnetic field
Correct Answer

A. They casue the precessional frequency to vary with position
11.

If a patient is placed in a perfectly homogeneous 1.0 T MR system in the absence of a gradient magnetic field, and an RF pulse was transmitted at 43 MHz, _ would absorbe the RF energy.
- Only the protons near the patient's head
- Only protons on the patient's left side
- Only protons in th ecenter of the magnet
- None of the protons
Correct Answer

A. None of the protons
12.

The _ gradient will make the precessional frequency of the magnetization of protons in the patient's right eye different than that of the left heel.1. x 2. y 3. z
- 1&3
- 1 &2
- 1, 2, & 3
- 2 & 3
Correct Answer

A. 1, 2, & 3

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Current Version
Jun 16, 2020

Quiz Edited by
ProProfs Editorial Team
Jan 25, 2009

Quiz Created by
Athelco

Forming Mr Images

In order for energy to be efficiently transferred between a transmitter and a receiver, the two must be at the same:

Quiz Preview

If the field strength experienced by a patient within an MR magnet was increased, the precessional frequency of the magnetization of the patient's protons would be expected to:

_ is defined as a small change in the magnetic field along a particular axis.

If a group of protons moves toward the high end of a gradient the precessional frequency of their magnetization:

The - gradient creates a change in the magnetic field from the patient's left side to the right side1. x2. y3. z

An image creted from a slice perpendicular to the axis running from anterior to posterior in the patient is called?

In MRI, RF energy is

In order to disturb the protons in a particular location of the body, the frequency of the transmitted RF energy must be:

If the slice though the patient that we wish to image is in a magnetic field of 0.995 T, the RF energy sould be transmitted at _ MHz.

Which of the following is the function of the gradients?

If a patient is placed in a perfectly homogeneous 1.0 T MR system in the absence of a gradient magnetic field, and an RF pulse was transmitted at 43 MHz, _ would absorbe the RF energy.

The _ gradient will make the precessional frequency of the magnetization of protons in the patient's right eye different than that of the left heel.1. x 2. y 3. z