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Free Demo / MRI Imaging Parameters

MRI Imaging Parameters

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Q1 Which MRI parameter has the greatest direct effect on total scan time?
A Slice thickness
B TR
C TE
D Receiver bandwidth
Q2 A technologist decreases FOV and increases matrix size. What is the overall effect?
A Lower spatial resolution
B Improved spatial resolution
C Increased slice thickness
D Reduced acquisition matrix
Q3 Flip angle is increased on a GRE sequence to improve T1 contrast. What SNR tradeoff exists?
A SNR always improves with higher flip angle because more magnetization is tipped into the transverse plane
B SNR peaks at the Ernst angle and decreases if flip angle exceeds it
C SNR is unaffected by flip angle on GRE because TR is the only determinant of signal
D SNR decreases linearly with every degree of flip angle increase regardless of TR or T1
Q4 Receive bandwidth is increased to reduce chemical shift artifact. What image quality cost results?
A Spatial resolution decreases because wider bandwidth spreads the readout across more pixels
B Scan time increases because wider bandwidth requires more time to sample each echo
C SNR decreases because more noise is sampled per voxel
D T2 contrast decreases because bandwidth directly affects echo time and relaxation weighting
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