Chapter 7 Volume Imaging & Multiplaner Reconstructions MRIT
602 - Capstone
Due Aug 16 at 11:59pm
Points 37
Questions 37
Available Aug 12 at 12am - Aug 16 at 11:59pm
Time Limit None
Allowed Attempts 2
Take the Quiz Again
Attempt History
Attempt Time Score
LATEST Attempt 1 16 minutes 36 out of 37
Correct answers are hidden.
Score for this attempt: 36 out of 37
Submitted Aug 13 at 3:02pm
This attempt took 16 minutes.
Question 1
pts
In a 3D volume pulse sequence, if the Y gradient is applied to encode each slice with a unique amount of
phase, images will result.
, Coronal
Sagittal
Transverse
Oblique
In 3D imaging techniques, individual serial slices are spatially encoded by applying an additional phase
encoding gradient along the slice direction. If the y-gradient is used for this purpose, then the y-axis is
the slice direction. When the y-axis is the slice direction, the resulting images are perpendicular to that
direction.
Question 2
pts
In a 3D volume pulse sequence with a 256 x 256 matrix and 16 transverse slices, unique phases
must be generated by the Z gradient, assuming 1 acquisition.
16
32
256
512
As many phase encoding steps are required along the slice direction as the number of slices. Therefore,
if the pulse sequence generates images of 16 slices, then the same number of phase encoding steps are
required along the slice direction. Since these images are in the transverse plane, then the z-gradient is
used as the slice encoding gradient (i.e. the phase encoding gradient which is applied along the slice
direction).
, Question 3
pts
In a 3D volume pulse sequence with a 256 x 256 matrix and 16 transverse slices, and the Y gradient is
responsible for in plane phase encoding, unique phases must be generated by the X gradient,
assuming 1 acquisition?
16
32
256
No
The in-plane spatial encoding of the transverse slices are accomplished by the y- and x-gradients. The y-
gradient is used for the in-plane phase encoding in this sequence. Therefore, the x-gradient is used for
frequency encoding and is not used to generate phase information in this sequence.
Question 4
pts
In a 3D volume pulse sequence with a 256 x 256 matrix, 16 transverse slices, and the Y gradient
responsible for in plane phase encoding, unique phases must be generated by the Y gradient,
assuming 1 acquisition and no RFOV or parallel imaging?
16
32
256
512
The in-plane spatial encoding of the transverse slices are accomplished by the y- and x-gradients. The y-
gradient is used for the in-plane phase encoding in this sequence. Therefore, with a matrix of 256 x 256,
256 unique phases must be generated by the y-gradient. The z-gradient is used as the slice select
gradient, and therefore the z-gradient must generate 16 unique phases in order to encode each of the 16
slices along the 3D volume.
Question 5
pts
Gradient echo sequences are rarely used for the delineating tumors because?
1. Gradient echo sequences are to complicated to run
2. Gradient echo techniques do not produce true T2 contrast
3. Partial volume artifacts are more common with gradient echo sequences
1 only
2 only
602 - Capstone
Due Aug 16 at 11:59pm
Points 37
Questions 37
Available Aug 12 at 12am - Aug 16 at 11:59pm
Time Limit None
Allowed Attempts 2
Take the Quiz Again
Attempt History
Attempt Time Score
LATEST Attempt 1 16 minutes 36 out of 37
Correct answers are hidden.
Score for this attempt: 36 out of 37
Submitted Aug 13 at 3:02pm
This attempt took 16 minutes.
Question 1
pts
In a 3D volume pulse sequence, if the Y gradient is applied to encode each slice with a unique amount of
phase, images will result.
, Coronal
Sagittal
Transverse
Oblique
In 3D imaging techniques, individual serial slices are spatially encoded by applying an additional phase
encoding gradient along the slice direction. If the y-gradient is used for this purpose, then the y-axis is
the slice direction. When the y-axis is the slice direction, the resulting images are perpendicular to that
direction.
Question 2
pts
In a 3D volume pulse sequence with a 256 x 256 matrix and 16 transverse slices, unique phases
must be generated by the Z gradient, assuming 1 acquisition.
16
32
256
512
As many phase encoding steps are required along the slice direction as the number of slices. Therefore,
if the pulse sequence generates images of 16 slices, then the same number of phase encoding steps are
required along the slice direction. Since these images are in the transverse plane, then the z-gradient is
used as the slice encoding gradient (i.e. the phase encoding gradient which is applied along the slice
direction).
, Question 3
pts
In a 3D volume pulse sequence with a 256 x 256 matrix and 16 transverse slices, and the Y gradient is
responsible for in plane phase encoding, unique phases must be generated by the X gradient,
assuming 1 acquisition?
16
32
256
No
The in-plane spatial encoding of the transverse slices are accomplished by the y- and x-gradients. The y-
gradient is used for the in-plane phase encoding in this sequence. Therefore, the x-gradient is used for
frequency encoding and is not used to generate phase information in this sequence.
Question 4
pts
In a 3D volume pulse sequence with a 256 x 256 matrix, 16 transverse slices, and the Y gradient
responsible for in plane phase encoding, unique phases must be generated by the Y gradient,
assuming 1 acquisition and no RFOV or parallel imaging?
16
32
256
512
The in-plane spatial encoding of the transverse slices are accomplished by the y- and x-gradients. The y-
gradient is used for the in-plane phase encoding in this sequence. Therefore, with a matrix of 256 x 256,
256 unique phases must be generated by the y-gradient. The z-gradient is used as the slice select
gradient, and therefore the z-gradient must generate 16 unique phases in order to encode each of the 16
slices along the 3D volume.
Question 5
pts
Gradient echo sequences are rarely used for the delineating tumors because?
1. Gradient echo sequences are to complicated to run
2. Gradient echo techniques do not produce true T2 contrast
3. Partial volume artifacts are more common with gradient echo sequences
1 only
2 only
