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MRI Physics Final Test 2024/2025(Questions With 100% Correct Answers)A+ Graded Verified $9.99   Add to cart

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MRI Physics Final Test 2024/2025(Questions With 100% Correct Answers)A+ Graded Verified

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  • Course
  • MRI Physics
  • Institution
  • MRI Physics

all the following are artifacts in MRI except - ANSWER beam hardening _____ is defined as the strength of the gradient over distance - ANSWER slew rate .5T is equal to _____ Gauss. - ANSWER 5,000

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  • October 3, 2024
  • 7
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers
  • MRI Physics
  • MRI Physics
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STARSHINESTUVIA
MRI Physics Final Test 2024/2025(Questions With 100%
Correct Answers)A+ Graded Verified
all the following are artifacts in MRI except - ANSWER beam hardening

_____ is defined as the strength of the gradient over distance - ANSWER slew rate

.5T is equal to _____ Gauss. - ANSWER 5,000

A FLAIR inversion sequence is utilized to null - ANSWER CSF

A STIR inversion sequence is utilized to null - ANSWER fat

a double echo, spin echo pulse sequence normally results in ____ - ANSWER T2 and proton
density weighted

an inversion recovery is a pulse sequence that begins with a ____ degree inverting pulse -
ANSWER 180

a second (or additional) spin or wobble of the magnetic moment is defined as_____ -
ANSWER precession

hydrogen precesses at approximately ______ MHz/T in a .5T MRI unit - ANSWER 21

the time taken to rephase after the application of the 180 degree RF equals the time to dephase
when the - ANSWER TAU

______ reflects the relationship balance between spin up and spin down nuclei. - ANSWER
net magnetification vector

"active" shielding work to ____ , while passive shielding work to _____ - ANSWER shrink the
magnetic field, contain the magnetic field

to "null" a signal is to _____ a signal - ANSWER reduce

data points in k-space are converted to frequency amplitude in the frequency domain by a
process called - ANSWER fast fourier transfer

which of the following is incorrect? - ANSWER data acquired in the central lines of k-space
contribute to resolution, while data acquired in the outer lines contribute to

_____ extrapolates right side data and places it on the left side - ANSWER partial echo
imaging

, for which of the following is it crucial to have a TR that is shorter than the T1 and T2 times of the
tissue - ANSWER steady state

homogeneity is measured in: - ANSWER ppm

how does increasing the sampling time affect the minimum TE time? - ANSWER increase

If i want to increase image resolution, I would _____ slice thickness - ANSWER decrease

if only a single RF pulse were applied, what flip angle would produce the optimal signal return? -
ANSWER 90

if the gyromagnetic ratio of a substance is 2Mhz/ tesla and the magnetic field strength is 10
Telsa, then the - ANSWER 20 Mhz

if the matrix is increased, what happens to SNR? - ANSWER decrease

if we increase the NEX from 1 to 4, our scan time will _____ - ANSWER increase by a factor
of 4

if you decrease receive bandwidth, you _____ SNR - ANSWER increase

if you increase matrix, you increase resolution and ____ scan time - ANSWER increase

if you increase the matrix size and keep the FOV the same, the pixel size will: - ANSWER
decrease

in a pulse sequence utilizing 2 echoes, the first image is typically a ____ image, while the
second is a - ANSWER proton density

in a time of flight sequence, the tissue is hypointense relative to the flowing blood because of: -
ANSWER saturation effects

in fast spin echo weighting, the _____ encoding slopes are centered on the effective TE
selected. - ANSWER shallow

what is the unit of measurement for the strength of the gradient magnetic field? - ANSWER
mT/m

it is recommended that that the general public those persons who have not been properly
screened for the effect - ANSWER 25G

matter unaffected by a magnetic field is termed: - ANSWER diamagnetic

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