In a spin echo pulse sequence, the time between the 90-degree RF pulse and the
180-degree refocusing pulse is
a) the TE
b) 1/4 the TE
c) 1/2 the TE
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1/2 the TE
The physical gradient that varies the magnetic field in the anterior-to-posterior
direction is
a) the x-gradient
b) the y-gradient
c) the z-gradient
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, the y-gradient
T2* (T2-star) is transverse decay due to
a) T2 and T1
b) T2 only
c) T2 plus effects inhomogeneities and chemical shift
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T2 plus effects inhomogeneities and chemical shift
In a gradient echo sequence, T1-weighting can be controlled by
a) the TE
b) the inversion time
c) both the flip angle and the TR
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both the flip angle and the TR
With regard to MR raw data, edge detail is provided by
a) high frequencies
b) low frequencies
c) mid-range frequencies
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, high frequencies
The T2-relaxation time for any given tissue is defined as when
a) 63% of longitudinal magnetization has recovered
b) 63% of transverse has recovered
c) 63% of transverse has decayed
d) 63% of longitudinal magnetization has decayed
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63% of transverse has decayed
Acquired voxels which are equal in all three dimensions are referred to as
a) linear
b) isotropic
c) asymmetric
d) quadratic
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isotropic
Optimum signal due to flow is achieved when the blood flow is
a) Parallel to the slice plane
b) Diagonal to the slice plane
c) Perpendicular to the readout gradient
d) Perpendicular to the slice plane
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, Perpendicular to the slice plane
Which of the following parameters controls the amount of T2-weighting when using a
spin echo pulse sequence
a) TR
b) TE
c) Flip angle
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TE
Which of the following b-values would result in the greatest diffusion-weighting?
a) 500
b) 750
c) 900
d) 1200
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1200
Which of the following techniques for fat suppression can be successfully utilized at
ALL field strengths following the injection of a gadolinium-based contrast agent
a) STIR
b) Spectral Pre-Saturation
c) Dixon Method
Give this one a try later!
180-degree refocusing pulse is
a) the TE
b) 1/4 the TE
c) 1/2 the TE
Give this one a try later!
1/2 the TE
The physical gradient that varies the magnetic field in the anterior-to-posterior
direction is
a) the x-gradient
b) the y-gradient
c) the z-gradient
Give this one a try later!
, the y-gradient
T2* (T2-star) is transverse decay due to
a) T2 and T1
b) T2 only
c) T2 plus effects inhomogeneities and chemical shift
Give this one a try later!
T2 plus effects inhomogeneities and chemical shift
In a gradient echo sequence, T1-weighting can be controlled by
a) the TE
b) the inversion time
c) both the flip angle and the TR
Give this one a try later!
both the flip angle and the TR
With regard to MR raw data, edge detail is provided by
a) high frequencies
b) low frequencies
c) mid-range frequencies
Give this one a try later!
, high frequencies
The T2-relaxation time for any given tissue is defined as when
a) 63% of longitudinal magnetization has recovered
b) 63% of transverse has recovered
c) 63% of transverse has decayed
d) 63% of longitudinal magnetization has decayed
Give this one a try later!
63% of transverse has decayed
Acquired voxels which are equal in all three dimensions are referred to as
a) linear
b) isotropic
c) asymmetric
d) quadratic
Give this one a try later!
isotropic
Optimum signal due to flow is achieved when the blood flow is
a) Parallel to the slice plane
b) Diagonal to the slice plane
c) Perpendicular to the readout gradient
d) Perpendicular to the slice plane
Give this one a try later!
, Perpendicular to the slice plane
Which of the following parameters controls the amount of T2-weighting when using a
spin echo pulse sequence
a) TR
b) TE
c) Flip angle
Give this one a try later!
TE
Which of the following b-values would result in the greatest diffusion-weighting?
a) 500
b) 750
c) 900
d) 1200
Give this one a try later!
1200
Which of the following techniques for fat suppression can be successfully utilized at
ALL field strengths following the injection of a gadolinium-based contrast agent
a) STIR
b) Spectral Pre-Saturation
c) Dixon Method
Give this one a try later!
