Week 6 Quiz Flashcards
Cardiac analysis performed with a technique using SAT bands to assess wall motion is known as:
a. myocardial tagging
b. short-axis imaging
c. cardiac gating
d. four-chamber imaging
a. myocardial tagging
Which of the following best describes an FSE sequence?
a. a “train” of gradient echoes
b. a 180 pulse followed by a 90/180 combination
c. a “train” of spin echoes
d. a 90 pulse followed by a 180 pulse
c. a “train” of spin echoes
If one desires to null the signal from a specific tissue using an inversion recovery sequence, one should select an inversion time that is _________ of the T1 relaxation time of that tissue.
a. 69%
b. 43%
c. 80%
d. 37%
a. 69%
When used for MRI, cables from RF coils and ECG leads should be
a. separated and placed straight through the imager
b. formed into loops within the imager
c. neatly coiled and ready for use
d. laid along the patient’s right arm, along the bore
a. separated and placed straight through the imager
Following a 90° RF pulse, the signal that is created is called:
a. gradient echo
b. free induction decay
c. FRE
d. spin echo
b. free induction decay
Gradient strength (amplitude) is measured in units of:
a. mT/M
b. G/cm
c. T/m/s
d. µs
e. %
a and b only
Which of the following is an example of battery?
a. sharing patient information with another technologist in the work area
b. imaging the incorrect body part
c. threatening the patient
d. using an immobilization device
b. imaging the incorrect body part
The signal intensity on diffusion sequences is related to:
a. velocity-induced phase shift
b. flow-related enhancement
c. gadolinium
d. restricted diffusion
d. restricted diffusion
Which MRI technique is used to measure brain perfusion and aid in stroke assessment?
a. arterial spin labeling (ASL)
b. T1-weighted imaging
c. T2-weighted imaging
d. susceptibility-weighted imaging (SWI)
a. arterial spin labeling (ASL)
In order to create a thin slice thickness, a _______ is used.
a. Steep slice selection gradient
b. High amplitude slice selection gradient
c. Narrow transmit bandwidth (tBW)
d. Narrow receiver bandwidth (rBW)
a, b, and c
In a 3D acquisition, the slices are produced by:
a. sampling multiple lines of k-space per pulse sequence repetition
b. very accurate RF pulses
c. a phase-encoding gradient applied in the slice selection direction
d. multiple 180 pulses along the slice selection direction
c. a phase-encoding gradient applied in the slice selection direction
Figure B.4 was likely acquired with a spin echo or fast spin-echo acquisition with a:
a. short TR / long TE
b. long TR / short TE
c. short TR / short TE
d. long TR / long TE
d. long TR / long TE
Fourier transformation converts signal data from the FID into the spectrum.
true or false
true
Figure B.2 is an example of a:
a. PD
b. T2
c. all of the above
d. T1
e. T2*
a. PD
In which of the following EPI sequences would one expect there to be the least susceptibility (distortion) artifacts?
a. single-shot SE-EPI, 256 phase x 256 frequency
b. single-shot SE-EPI, 192 phase x 192 frequency
c. single-shot GRE-EPI, 512 phase x 192 frequency
d. multi-shot (4-shot) SE-EPI, 256 phase x 256 frequency
d. multi-shot (4-shot) SE-EPI, 256 phase x 256 frequency
Gradient echo sequences can yield either T1 or T2* characteristics, with influences caused by all of the following EXCEPT:
a. inhomogeneity
b. susceptibility
c. chemical shift
d. aliasing
d. aliasing
Gradient echo sequences can yield either T1 or T2* characteristics
true or false
true
On Figure B.4 the CSF appears brighter because:
a. water has a short T1 relaxation time
b. water has a high proton density
c. water has a short T2 relaxation time
d. water has a long T2 relaxation time
d. water has a long T2 relaxation time
There are various types of magnets that can be used for MR images. These include:
a. permanent magnet
b. resistive magnet
c. hybrid magnet
d. superconductive magnet
a, b, and c only
Which of the following components improves magnetic field homogeneity?
a. primary magnet coils
b. gradient coils
c. RF coils
d. shim coils
d. shim coils
This bleed is found in which pulse sequence?
a. STIR
b. T2 FLAIR
c. T2
d. T1 post contrast
b. T2 FLAIR
The patient who has too much insulin in their body is experiencing:
a. hypoglycemia
b. diabetic coma
c. hyperglycemia
d. hypovolemia
a. hypoglycemia
The first MRI images of a human were obtained in what year?
a. 1929
b. 1944
c. 1983
d. 1977
d. 1977
As the number of signal averages double which one of the following does not apply?
a. SNR doubles
b. signal drops
c. scan time doubles
d. SNR increase by the square root of the NSA
a. SNR doubles
In a Spin Echo sequence, which is applied first, the slice select or the excitation pulse?
a. slice select
b. excitation pulse
a. slice select
