Data manipulation

Question 1

the technique whereby a portoin of the lines of K spae are sampled and filled and the remaining lines are interpolated is known as

Answer 1

half foureir

partial fourier

fractional foureir

Question 2

in a 3D acquisition the slice are produced by

Answer 2

a phase encoding gradient applied in the slice selection direction

Question 3

the scan time for a 3D (volume) acquisition is given by

Answer 3

TR X NSA x number of phase encodings x number of slices

Question 4

one direction in k space represents phase while the other represents

Answer 4

frequency

Question 5

with conventional spin echo each line of k space is filled in each

Answer 5

TR period

Question 6

the top portion of k space is a mirror image of the

Answer 6

bottom

Question 7

acquiring half of the phase views of ka space and then interpolating the data for the other half is a technique known as

Answer 7

half fourier

Question 8

with a FSE sequence utilizing an eight echo train length (ETL) the number of lines of k space filled during each TR will be

Answer 8

8

Question 9

to create a projection image in MRA the technique most commonly employed is

Answer 9

maximum intensity pixel

Question 10

to evaluate the circle of willis (COW) 3D TOF MRA sequences are acquired and displayed as an axial view of all of the vasculature. this image is known as

Answer 10

collapsed image

Question 11

to evaluate the COW, 3D TOF MRA sequences are acquired and background tissue is carved out to provide better visualization of the intracranial vasculature. this step is known as

Answer 11

segmenting

Question 12

creating additional images in various planes from a 3D data set is accomplished by a technique known as

Answer 12

multiplanar reconstruction

Question 13

in order to produce a high quality reformatted image the

Answer 13

acquisition voxel should be isotropic

Question 14

collecting the low freq (high amplitude signal) data points in k space at the start of a scan (in a rectilinear fashion) is known as

Answer 14

centric

Question 15

collecting the low freq (high amplitude signal) data points in ka space at the start of a scan (in a spiral fashion) is known as

Answer 15

elliptic centric

Question 16

during dynami enhanced imaging for vasculature or visceral structures contrast is administered and ka space is filled with _____to ensure that the contrast enhancemnt is well visualized

Answer 16

centric

Question 17

the high freq (low amplitude) dat apoints in k space provide

Answer 17

edge detail (spatial resolution

Question 18

during contrast enhanced imaging fo the abdominal organs, images are acquired without and with gadolinium enhancement. to bettrer visualize contrast enhancment _______can be performed

Answer 18

subtraction

Question 19

a 3D data set can be reconstructed to display what appears to be a 3D image of the anatomy this technique is known as

Answer 19

volume rendering

Question 20

the evaluation of cardia function can be provided by any of the following

Answer 20

cardia cine

multiphase imaging

perfusoin imaging

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 freq is known as

Answer 21

fourier transformation

Question 22

the technique by which signal data is modified from the time domain to the freq domain is known as

Answer 22

`fourier transformation

Question 23

fourier transformation converts signal dat from the FID into the spectrum

Answer 23

true

Question 24

foureir transformation is performed in the

Answer 24

array processor

Question 25

cardia analysis performed with a technique using SAT band to assess wall motoin is known as

Answer 25

myocardial tagging