MRI Equipment
Review of mri equipment
- 1.
A component used to increasze the strength of a signal
- A.
Gradient coil
- B.
Equipment cabinet
- C.
Digital to analog converter
- D.
Amplifier
Correct Answer
D. Amplifier -
- 2.
The link between the technologist and the computerized electronic environment of the MR system hardware
- A.
Equipment room
- B.
Equipment cabinet
- C.
Operator's console
- D.
Gradient amplifiers
Correct Answer
C. Operator's console -
- 3.
The equipment cabinet houses...
Correct Answer
pulse sequence contoller, digital to analog convertor, the analog to digital convertor, gradient and RF power amplifiers - 4.
The magnet room houses...
Correct Answer
gradient coils, RF coils and the receiver amplifiers - 5.
The operators may be used for:1. converting digital to analog 2. viewing images3. archiving images
- A.
1 and 2
- B.
1 and 3
- C.
2 and 3
- D.
1, 2, and 3
Correct Answer
C. 2 and 3 -
- 6.
The pulse sequence controller is located
- A.
Inside the magnet
- B.
In the operator's console
- C.
On an rf coil
- D.
In the equipment cabinet
Correct Answer
D. In the equipment cabinet -
- 7.
The __ is located within an equipment cabinet
- A.
Magnetic shielding
- B.
RF power amplifier
- C.
Gradient coils
- D.
Rf coils
Correct Answer
B. RF power amplifier -
- 8.
The host computer
- A.
Is the interface between the technologist and the MR system
- B.
Constrains the fringe magnetic field to a smaller space
- C.
Digitizes the MR echoes
- D.
Reconstructs the MR images
Correct Answer
A. Is the interface between the technologist and the MR system -
- 9.
The _ is responsible for telling the gradients when and at what strength to turn on
- A.
Magnetic shielding
- B.
Pulse sequence controller
- C.
Rf power amplifier
- D.
Host computer
Correct Answer
B. Pulse sequence controller -
- 10.
The _ provides the elctrical power to the gradient coils
- A.
Pulse sequence controller
- B.
Rf power amplifier
- C.
Gradient power amplifier
- D.
Host computer
Correct Answer
C. Gradient power amplifier -
- 11.
The _ provides the electrical power to the gradient coils
- A.
Pulse sequence controller
- B.
Rf power amplifier
- C.
Gradient power amplifier
- D.
Host computer
Correct Answer
C. Gradient power amplifier -
- 12.
On a sagittal image which of the following would be affected if the gradient power amplifier for the x gradient coil malfuctioned and produced a gradient in the magnetic field of twice the prescribed strength
- A.
Thickness of the slice
- B.
Field of view of the slice
- C.
Image orientation
- D.
Image matrix
Correct Answer
A. Thickness of the slice -
- 13.
Upon installing a new MRI system, the service engineer mistakenly connects the x-gradient power amplifier to the y-gradient coil, the y-gradient power amplifier to the z-gradient coil, and the z-gradient power amplifier to the x-gradient coil. A __ image would result when the technologist runs the first transverse sequence.
- A.
Tranverse
- B.
Oblique
- C.
Coronal
- D.
Sagittal
Correct Answer
D. Sagittal -
- 14.
The RF shielding: 1. prevents the RF energy generated by the MR system from disturbing external radio signals2. restricts external radio signals from being detected 3. prevents RF related artifacts from resulting
- A.
1and 3
- B.
1 and 2
- C.
1, 2, and 3
- D.
2 and 3
Correct Answer
C. 1, 2, and 3 -
- 15.
A measure of the uniformity of the magnetic field of the system is a defintion of
- A.
Cryogen
- B.
Homogeneity
- C.
Quadrature
- D.
Precession
Correct Answer
B. Homogeneity -
- 16.
Which of the following is the defintion of shimming
- A.
Adjusting homogeneity of the magnetic field
- B.
Creating a linear change in the magnetic field
- C.
Confining the magnetic field to a smaller arfea
- D.
Rapidly shutting off the magnetic field
Correct Answer
A. Adjusting homogeneity of the magnetic field -
- 17.
__ magnets must be taken apart in order to shut off the magnetic field
- A.
Permanent
- B.
Superconducting
- C.
Electro
- D.
Resistive
Correct Answer
A. Permanent -
- 18.
Which of the following describes an electromagnet
- A.
Magnetic bricks are stacked together to form the magnet
- B.
Electrical current flows through a coil of wire and generates a magnetic field
- C.
A changing magnetic field around a coil of wire generates an electic field
- D.
A moving magnetic field induces an electrical current in a neighboring conductive material
Correct Answer
B. Electrical current flows through a coil of wire and generates a magnetic field -
- 19.
__ magnets must remain connected to a power source to maintain their magnetc field.
- A.
Resistive
- B.
Permanent
- C.
Superconducting
- D.
Bar
Correct Answer
A. Resistive -
- 20.
Which of the following is a disadvantage of resistive magnets?1. high energy consumption2. high cooling requirements3. not easy to shut off magnetic field
- A.
1 and 2
- B.
1 only
- C.
1 and 3
- D.
2 only
Correct Answer
A. 1 and 2 -
- 21.
_ magnets can be shut off most quickly in the case of an emergency
- A.
Permanent
- B.
Superconducting
- C.
Resistive
- D.
Bar
Correct Answer
C. Resistive -
- 22.
Which of the following is a disadvantage of resistive magnets?1. high energy consumption2. high cooling requirements3. not easy to shut off magnetic field
- A.
1 and 2
- B.
1 only
- C.
1 and 3
- D.
2 only
Correct Answer
A. 1 and 2 -
- 23.
Which of the following statements is true regarding the magnets used in MR systems1. some superconducting magnets can produce magnetic fields up to 10 T2. resistive magnets may only have horizontal magnetic fields3. permanent magnets are ideal for use in mobile MR systems
- A.
1 only
- B.
1 and 2
- C.
3 only
- D.
1 and 3
Correct Answer
A. 1 only -
- 24.
MR guided _ is an application of interventional MRI1. biopsy2. surgery3. ablation therapy
- A.
2 and 3
- B.
1, 2, and 3
- C.
1 and 2
- D.
1 and 3
Correct Answer
B. 1, 2, and 3 -
- 25.
The fringe magnetic field:
- A.
Is eliminated by using magnetic shielding
- B.
Is eliminated by shimming
- C.
Poses no safety risk if magnetic shielding is used
- D.
Can cause other nearby medical devices to malfuntion
Correct Answer
D. Can cause other nearby medical devices to malfuntion -
- 26.
The magnetic shielding
- A.
Reconstructs the images using the Fourier transform
- B.
Makes the magnetic field more uniform
- C.
Liearly varies the magnetic field along the axis of the magnet
- D.
Constrains the fringe magnetic field to a smaller space
Correct Answer
D. Constrains the fringe magnetic field to a smaller space -
- 27.
The __ gradient coils are wrapped on the top and bottom of the gradient cylinder
- A.
Z
- B.
X
- C.
X and z
- D.
Y
Correct Answer
D. Y -
- 28.
The __ encodes frequencies and phases into the MR echoes
- A.
Gradient coils
- B.
Host computer
- C.
RF coils
- D.
Analog to digital convertor
Correct Answer
A. Gradient coils -
- 29.
_is the definition of Faraday's law
- A.
A moving electron that will induce an electric field in a neighboring conductor
- B.
A moving electron that will induce a magnetic field in a neighboring conductor
- C.
A changing magnetic field that will induce an electrical current in a neighboring conductive material
- D.
A changing electric field that will induce a magnetic field in a neighboring conductor
Correct Answer
C. A changing magnetic field that will induce an electrical current in a neighboring conductive material -
- 30.
Which of the following is an example of Faradays law of induction?1. precessing net magnetization of protons inducing an electrical current in a surface coil2. precessing net magnetization of protons emitting an echo in response to RF pulses3. net magnetization of protons precessing at a rate governed by the strength of the magnetic field they are exposed to
- A.
1 only
- B.
2 only
- C.
3 only
- D.
1 AND 2
Correct Answer
A. 1 only -
- 31.
Which of the following is the function of the RF coils?1. transmission of the RF pulses2. digitizing the received MR echoes3. reception of the MR echoes
- A.
1 and 2
- B.
1 and 3
- C.
2 and 3
- D.
1, 2, and 3
Correct Answer
B. 1 and 3 -
- 32.
A _ coil is preferable when a very uniform signal intensity level must be achieved throughout a cross section of anatomy
- A.
Volumetric
- B.
Linear
- C.
Flat array
- D.
Surface
Correct Answer
A. Volumetric -
- 33.
Which of the following is true regarding function of RF coils1. The same coil may be used to transmit and receive the MR echoes2. seperate coils may be used to transmit the RF pulses and to receive the MR echoes3. a surface coil would be optimal for imaging structures deep within the brain
- A.
1 only
- B.
2 only
- C.
1 and 2
- D.
1 and 3
- E.
1, 2, and 3
Correct Answer
C. 1 and 2 -
- 34.
An RF coil geometry which links together several small surface coils in order to image a larger field of view is called _ coil
- A.
An array coil
- B.
A volumetric coil
- C.
A circularly polarized
- D.
A quadrature
Correct Answer
A. An array coil -
- 35.
A quadrature RF coil:1. uses two sets of coils oriented perpendicular to each other2. requires more power than an otherwise identical linear coil when transmitting3. has a higher signal to noise ratio than an otherwise identical linear coil
- A.
1 and 2
- B.
1 and 3
- C.
2 and 3
- D.
1, 2, and 3
Correct Answer
B. 1 and 3 -
- 36.
A quadrature coil is also known as a
- A.
An array coil
- B.
A circular polarized coil
- C.
A surface coil
- D.
A cardiac array coil
Correct Answer
B. A circular polarized coil -
- 37.
The echoes received from the patientgo through an amplifier to:
- A.
Close the RF recevier coil
- B.
In the operator's console
- C.
Close to the gradient power cabinet
- D.
In the pulse sequence controller
Correct Answer
A. Close the RF recevier coil -
- 38.
The array processor
- A.
Constrain sthe magnetic field within a smaller space
- B.
Lineraly varies the magnetic field along an axis of the magnet
- C.
makes the magnetic field more uniform
- D.
Reconstructs the images using the Fourier transform
Correct Answer
D. Reconstructs the images using the Fourier transform -
- 39.
The fourier transform is performed by which MRI system component
- A.
Receiver amplifier
- B.
DAC
- C.
Array processor
- D.
Host computer
Correct Answer
C. Array processor -
- 40.
Which of the following is not a function of a PACS system
- A.
Image display for the radiologists
- B.
Digital distribution of images
- C.
Long term data storage
- D.
Reconstruction of the image from the raw data
Correct Answer
D. Reconstruction of the image from the raw data -
Quiz Review Timeline +
Our quizzes are rigorously reviewed, monitored and continuously updated by our expert board to maintain accuracy, relevance, and timeliness.
-
Current Version
-
Mar 18, 2022Quiz Edited by
ProProfs Editorial Team -
Jan 18, 2009Quiz Created by
Athelco
Back to top