Data manipulation

Question 1

The technique whereby a portion of the lines of k-space are sampled ad filled and the remaining lines are interpolated are known as all of the following except
A) half fourier
B) partial fourier
C) practional fourier
D) interleaved fourier

Answer 1

d

Question 2

in a 3D acquisition, the slices are produced by
A) a phase encoding gradient in the slice direction
B) multiple 180˚ pulses along the slice direction
C) sampling multiple lines of k-space per pulse sequence repetition
D) very accurate RF pulses

Answer 2

a

Question 3

what is the purpose of using an interleaved acquisition

Answer 3

to avoid cross talk artifact that occurs between adjacent slices

Question 4

the scan time for a 3D acquisition is given by
A) TR x NSA x BW x slice thickness
B) TR x NSA x #PE’s x # of slabs
C) TR x NSA x #PE’s x ETL
D) TR x NSA x #PE’s x # of slices

Answer 4

d

Question 5

one direction in k-space represents phase, the other represents
A) position
B) intensity
C) contrast
D) frequency

Answer 5

d

Question 6

with conventional SE each line of k-space is filled with each
A) FE period
B) TE period
C) TR period
D) excitation period

Answer 6

c

Question 7

the top of k-space is a mirror image of the
A) right
B) left
C) top
D) bottom

Answer 7

d

Question 8

acquiring half of the phase views of k-space and then interpolating the data for the other half is a technique known as
A) zero fill
B) FSE
C) half fourier
D) power scanning

Answer 8

c

Question 9

with a FSE sequence utilising an 8 ETL, the number of k space lines filled with each TR is
A) 4
B) 2
C) 12
D) 8

Answer 9

d

Question 10

to create a projection image in MRA, the technique most commonly employed is
A) multiplanar reconstruction
B) Region of interest calculation
C) maximum intensity pixel
D) summation pixel projection

Answer 10

c

Question 10

to evaluate COW, 3D TOF MRA sequences are acquired and displayed as an axial view of all of the vasculature. This view is known as
A) multiplanar reconstruction
B) segmented image
C) minimum intensity pixel
D) collapsed image

Answer 10

d

Question 11

to evaluate the COW, 3D TOF MRA sequences are acquired and background tissue is carved out to provide better visualisation of intracranial vasculature. This technique is known as
A) multiplanar reconstruction
B) segmenting
C) maximum intensity pixel
D) collapsed image

Answer 11

b

Question 12

creating additional images in various planes from a 3D dataset is called
A) multiplanar reformatting
B) region of interest calculation
C) maximum intensity pixel
D) summation pixel projection

Answer 12

a

Question 13

in order to produce a high quality reformatted image the
A) acquisition voxel must be as rectangular as possible
B) patient must hold their breath
C) acquisition voxel must be isotropic
D) acquisition voxel must be anisotropic

Answer 13

c

Question 14

collecting low frequency data points in k-space as the start of the scan in a rectilinear fashion is known as
A) linear
B) centric
C) elliptic centric
D) reverse centric

Answer 14

b

Question 15

during dynamic enhanced imaging for vasculature or visceral structures, contrast is administered and k-space is filled with ______ to ensure the contrast enhancement is well visualised
A) linear
B) centric
C) reverse centric
D) reverse linear

Answer 15

b

Question 16

high frequency (low amplitude) data points in k-space provide
A) bulk of the image contrast
B) majority of the image contrast
C) for reduced noise
D) spatial resolution (edge detail)

Answer 16

d

Question 17

collecting low frequency data points in k-space at the start of the scan in a spiral fashion is known as
A) linear
B) centric
C) eliptic centric
D) reverse centric

Answer 17

c

Question 18

during contrast enhanced imaging of the abdominal organs, images are acquired without and with gadolinium. To better visualise contrast enhancement _______ can be performed
A) multiplanar reconstruction
B) subtraction
C) region of interest calculation
D) volume rendering

Answer 18

b

Question 19

3D dataset can be reconstructed to display what appears to be a 3D image of the anatomy. This technique is known as
A) multiplanar reconstruction
B) region of interest calculation
C) subtraction
D) volume rendering

Answer 19

d

Question 20

the evaluation of cardiac function can be provided by any or all of the following except
A) cardiac cine
B) multiphase imaging
C) perfusion imaging
D) short axis, single slice, single phase

Answer 20

d

Question 21

the technique by which signal data is transformed from a plot of signal intensity over time to a plot of signal intensity over frequency is known as
A) fourier transformation
B) chemical shift
C) parts per million
D) volume rendering

Answer 21

a

Question 22

technique in which data is modified from the time domain to the frequency domain is known as
A) fourier transformation
B) chemical shfit
C) parts per million
D) volume rendering

Answer 22

a

Question 23

fourier transformation converts signal from the FID into the spectrum
A) true
B) false

Answer 23

a

Question 24

fourier transform is performed in the
A) fourier transformer
B) array processor
C) k-spacer
D) RF amplifier

Answer 24

b

Question 25

cardiac analysis performed with a technique using SAT bands to assess wall motion is known as
A) myocardial tagging
B) four-chamber imaging
C) short axis imaging
D) cardiac gating

Answer 25

a