CAMRT: Gradients Exam | Questions with 100%
Correct Answers | Verified | Latest Update
2026/2027
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Terms in this set (90)
When no gradient is applied, how In phase
are the magnetic moments of
hydrogen?
What is the process of dephasing Gradient spoiling
magnetic moments with gradients
called?
How do gradients dephase magnetic A negative lobe gradient is applied to coherent (in
moments? phase) magnetization and altering the frequencies
of the spins. Some speed up or slow down,
depending where they are along the gradient axis
How does a gradient-echo occur? When the magnetic moments are in the same place
at the same time, inducing a maximum signal in the
receiver coil
, How do gradients rephase magnetic A positive lobe gradient is applied to incoherent
moments? (out of phase) magnetization and alters the
magnetic field in a linear fashion along the gradient
axis.
Slow spins experience a higher magnetic field →
speed up
Fast spins experience a lower magnetic field →
slow down
Why are gradients sensitive to The rephasing gradient only affects the magnetic
magnetic field inhomogeneities? moments that are dephased by the gradient
What gradient is responsible for Frequency-encode gradient
dephasing/rephasing of spins?
T/F: The area under the negative False:
lobe of the gradient is twice the area
of the positive lobe gradient Half that of the area of the positive lobe
Why can short TRs be used in GRE Low flip angles means less longitudinal
sequences? magnetization is converted to transverse
magnetization, therefore less time required for
relaxation
How is T1W maximized in GRE TR: Short
sequences? TE: short
FA: large
How is T2*W maximized in GRE TR: long
sequences? TE: long
FA: small
Correct Answers | Verified | Latest Update
2026/2027
Save
Terms in this set (90)
When no gradient is applied, how In phase
are the magnetic moments of
hydrogen?
What is the process of dephasing Gradient spoiling
magnetic moments with gradients
called?
How do gradients dephase magnetic A negative lobe gradient is applied to coherent (in
moments? phase) magnetization and altering the frequencies
of the spins. Some speed up or slow down,
depending where they are along the gradient axis
How does a gradient-echo occur? When the magnetic moments are in the same place
at the same time, inducing a maximum signal in the
receiver coil
, How do gradients rephase magnetic A positive lobe gradient is applied to incoherent
moments? (out of phase) magnetization and alters the
magnetic field in a linear fashion along the gradient
axis.
Slow spins experience a higher magnetic field →
speed up
Fast spins experience a lower magnetic field →
slow down
Why are gradients sensitive to The rephasing gradient only affects the magnetic
magnetic field inhomogeneities? moments that are dephased by the gradient
What gradient is responsible for Frequency-encode gradient
dephasing/rephasing of spins?
T/F: The area under the negative False:
lobe of the gradient is twice the area
of the positive lobe gradient Half that of the area of the positive lobe
Why can short TRs be used in GRE Low flip angles means less longitudinal
sequences? magnetization is converted to transverse
magnetization, therefore less time required for
relaxation
How is T1W maximized in GRE TR: Short
sequences? TE: short
FA: large
How is T2*W maximized in GRE TR: long
sequences? TE: long
FA: small
