MRI PHYSICS – ARMRIT TEST EXAM WITH
CORRECT QUESTIONS AND CORRECTLY
WELL DEFINED ANSWERS LATEST
ALREADY GRADED A+ 2025 – 2026
NEX ( NUMBER OF EXCITATIONS) - ANSWERS-The only
parameter that changes both SNR and resolution in the
same direction is?
Increasing the signal relative to the noise - ANSWERS-To
increase the SNR usually requires_____.
Image contrast - ANSWERS-Residual transverse
magnetization affects?
Echo spacing - ANSWERS-The spawning between each echo
is called the ________.
A 180° RF pulse flips the - ANSWERS-Dephased nuclei
thorough 180°. The fat edge is now behind the slow edge
, Rise time - ANSWERS-Time required for MRI machine to
reach field strength for gradient. Steeper slope longer time.
Receive bandwidth to increase signal (SNR) - ANSWERS-
Decrease this and you have better SNR
Proton density weighed images - ANSWERS-Long TR, short T,
small flip angle highest signal to nose ratio.
Magnetization transfer contrast (MTC) - ANSWERS-
Technique used to suppress bound protons by saturating
them before the excitation pulse. This reduces the signal in
free protons. This increases the contrast (CNR) between
normal pathological tissues. Good in angiography and joint
imaging.
What effects voxel size - ANSWERS-Slice thickness (slope of
the gradient), FL , the matrix (#of encodings)
Voxel volume to increase signal (SNR) - ANSWERS-Lager
voxel more signal (SNR), thicker slicers, larger FOV more in
picture, smaller image matrix (determines amount of pixels)
CORRECT QUESTIONS AND CORRECTLY
WELL DEFINED ANSWERS LATEST
ALREADY GRADED A+ 2025 – 2026
NEX ( NUMBER OF EXCITATIONS) - ANSWERS-The only
parameter that changes both SNR and resolution in the
same direction is?
Increasing the signal relative to the noise - ANSWERS-To
increase the SNR usually requires_____.
Image contrast - ANSWERS-Residual transverse
magnetization affects?
Echo spacing - ANSWERS-The spawning between each echo
is called the ________.
A 180° RF pulse flips the - ANSWERS-Dephased nuclei
thorough 180°. The fat edge is now behind the slow edge
, Rise time - ANSWERS-Time required for MRI machine to
reach field strength for gradient. Steeper slope longer time.
Receive bandwidth to increase signal (SNR) - ANSWERS-
Decrease this and you have better SNR
Proton density weighed images - ANSWERS-Long TR, short T,
small flip angle highest signal to nose ratio.
Magnetization transfer contrast (MTC) - ANSWERS-
Technique used to suppress bound protons by saturating
them before the excitation pulse. This reduces the signal in
free protons. This increases the contrast (CNR) between
normal pathological tissues. Good in angiography and joint
imaging.
What effects voxel size - ANSWERS-Slice thickness (slope of
the gradient), FL , the matrix (#of encodings)
Voxel volume to increase signal (SNR) - ANSWERS-Lager
voxel more signal (SNR), thicker slicers, larger FOV more in
picture, smaller image matrix (determines amount of pixels)
