evaluation, q&a, and oral exam campusnet and comments
TRANSCRIPT
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Center for Fast Ultrasound Imaging Department of Electrical Engineering
Evaluation, Q&A, and oral exam Jørgen Arendt Jensen December 4, 2017 Center for Fast Ultrasound Imaging, Build 349 Department of Electrical Engineering Technical University of Denmark
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Topics for today
• Course evaluation on CampusNet and comments • Oral exam and time slots:
– Wednesday 13/12, 2017
– Thursday 14/12, 2017 • Q&A session: Monday 11/12, 2017 at 13.30 in this room
• Help on CT assignments • MR lecture & exercise
2/x
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark 3/x
CampusNet evaluation: When is the deadline? Only 8 have filled it out, so we will look at this Monday
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Oral exam
• 20 min time slots in room 214, building 349 • Take one question, explain on black board • No books or notes in the room • Reading list and questions on CampusNet • Time slots are listed on CampusNet and list is here
• Q&A session: – Monday 11/12, 2017 at 13.30 in this room
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Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
CT assignments
• Usual hand-in of reports • Standard pdf, readable in Urkund • Remember to include the code
• Grade will be available before the exam
5/x Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Shepp-Logan phantom
6/x
Note that the Shepp-Logan phantom is not in Hounsfield units, but the relative scaling is the same.
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Hounsfield units
From
: W. A
. Kal
ende
r; C
ompu
ted
Tom
ogra
phy,
Pub
licis
, 200
5
Note that the in-vivo data on the website is off-set by 1000 HU (-1000 is off-set to 0)
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Influence from number of projections
8/x
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Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Comparison between filters
9/x Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Circular convolution
10/x
−100 −80 −60 −40 −20 0 20 40 60 800
0.01
0.02
h(n)
Filter
−100 −80 −60 −40 −20 0 20 40 60 800
5
10
15
20
g 1(n)
Periodic time signal
−100 −80 −60 −40 −20 0 20 40 60 800
2
4
g 1(n)
Resulting periodic time signal with overlap
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Circular convolution
11/x
−100 −80 −60 −40 −20 0 20 40 60 800
2
4
Sample number (n)
g 2(n)
Periodic time signal without overlap
−100 −80 −60 −40 −20 0 20 40 60 800
0.01
0.02
h(n)
Filter
−100 −80 −60 −40 −20 0 20 40 60 800
5
10
15
20
g 1(n)
Periodic time signal
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Circular convolution – Shepp-Logan
12/x
Ideal Shepp−logan phantom, 512 x 512 pixels, Range: [0.95 1.1]
Relative x−coordinate
Rel
ativ
e y−
coor
dina
te
−3 −2 −1 0 1 2
−3
−2
−1
0
1
2
4
Center for Fast Ultrasound Imaging, Department of Electrical Engineering Technical University of Denmark
Backprojection
13/x
Patient grid
Projec
tion