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Noise and Artifact Reduction in Flat Detector
CT Perfusion Imaging
Michael Manhart1,2)
Yu Deuerling-Zheng 3), Andè Aichert1,2), Markus Kowarschik3), Andreas Maier2)
Tobias Struffert1), Joachim Hornegger2), Arnd Dörfler1)
1) Department of Neuroradiology, Universitätsklinikum Erlangen, Germany
2) Pattern Recognition Lab, FAU Erlangen-Nürnberg, Germany
3) Siemens AG, Angiography & Interventional X-Ray Systems, Germany
Workshop on Iterative
Reconstruction with Compressed
Sensing
January, 20th 2014
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
1. Flat Detector CT Perfusion
2. Digital Brain Perfusion Phantom
3. Reconstruction & Noise Reduction
4. Numerical Study: Digital Brain Phantom
5. Clinical Patient Studies
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
Flat Detector CT Perfusion
3
1. intra-venous contrast
agent injection
2. (Flat Detector ) CT scanning
3. image analysis to quantify
blood flow
● CT Perfusion (CTP) quantifies
blood flow in brain for diagnosis of
ischemic stroke
● New treatment options for stroke:
catheter guided therapy in
interventional room
● Flat Detector CTP: monitor
perfusion before and during
intervention using C-arm system
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
Scanning Protocols
4
Challenges:
● Low C-arm acquisition speed (3.6-5.5 s / 200°incl. pause)
● Angular under-sampling (133-248 projections / 200°)
● Low contrast-to-noise ratio in brain tissue (peak 5-30 HU)
● Patient motion
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
Scanning Protocols
5
• 3 s Protocol with robotic C-arm system
• 2 Mask Rotations
• 10 Bolus Rotations
• 133 Projections / Rotation
• 2.6 s / Rotation
• 1 s Pause between Rotations
• 5 s Protocol with bi-plane C-arm system
• 2 Mask Rotations
• 7 Bolus Rotations
• 248 Projections / Rotation
• 4.2 s / Rotation
• 1 s Pause between Rotations
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
1. Flat Detector CT Perfusion
2. Digital Brain Perfusion Phantom
3. Reconstruction & Noise Reduction
4. Numerical Study: Digital Brain Phantom
5. Clinical Patient Studies
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
Dynamic Brain Phantom - Time Curves
7
Online available: http://www5.cs.fau.de/data
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
Dynamic Brain Phantom - Projection Data
8
Full Projection Data
with Tissue and
Bone
Subtracted
Projection Data with
Dynamic Contrast
Enhancement
Subtracted
Projection Data with
Dynamic Contrast
Enhancement and
Poisson Noise
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
1. Flat Detector CT Perfusion
2. Digital Brain Perfusion Phantom
3. Reconstruction & Noise Reduction
4. Numerical Study: Digital Brain Phantom
5. Clinical Patient Studies
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
Flat Detector CT Perfusion
10
FDK reconstruction of mask and bolus sweeps
Rigid motion correction Mask subtraction
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
DynaCT Perfusion
11
Noise & artifact reduction
Time-contrast curve computation
Perfusion parameter maps calculation
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
FDK-SR-JBF Algorithm for Flat Detector Perfusion CT
Noise Reduction by Joint Bilateral Filtering (JBF)
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
Noise Reduction: Bilateral Filtering
13
Tomasi, C & Manduchi, R: Bilateral Filtering for Gray and Color Images;
Proc. IEEE ICCV, 1998 Pictures:
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
Noise Reduction: Joint Bilateral Filtering (JBF)
14
Petschnigg, G et al.: Digital Photography with Flash and No-Flash Image Pairs;
Proc. ACM SIGGRAPH, 2004
Pictures:
Flash No Flash JBF
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
Joint Bilateral Filtering: Perfusion Guidance Volume
15
Volume 1
Volume 2
Volume 10
Temporal maximum intensity projection (MIP):
MIP max
3D Bilateral
Filtering Guidance
MIP
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
Joint Bilateral Filtering for Flat Detector Perfusion
16
Volume 2
Volume 4
Volume 8
MIP (Guidance Volume)
JBF JBF JBF
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
FDK-SR-JBF Algorithm for Flat Detector
Perfusion CT
Streak Artifact Reduction (SR)
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
Streak Artifact Detection in Guidance Image
18
MIP
Total
Variation of
MIP
Slice 63 Slice 100
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
Vessel/Streak Identification
19
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
Guidance Image Streak Identification
● Brain segmentation in air, bones and tissue
● Identify vessel & streaks by MIP thresholding and TCC
analysis
● negative MIP value in tissue -> streak
● high MIP value in tissue:
● TAC has single high uptake -> vessel
● Otherwise -> streak
● Identify streaks by total variation of MIP
● high total variation and no vessel -> streak
20
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
Guidance Image Streak Removal (SR)
21
Streak
smoothing Bilateral
filtering Joint bilateral
3 Iterations
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
FDK-SR-JBF Algorithm
22
FDK reconstruction
Joint bilateral filtering Update guidance volume
For i = 1 … Nit Temporal MIP computation
Joint bilateral filtering
Streaks identification
Smoothing of streaks in MIP
Reco
nstru
ction
&
Mo
tion
com
pen
sation
Streak remo
val
Final d
eno
ising
Rigid motion compensation
Initial D
eno
ising
Mask subtraction
Bilateral filtering of MIP
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
1. Flat Detector CT Perfusion
2. Digital Brain Perfusion Phantom
3. Reconstruction & Noise Reduction
4. Numerical Study: Digital Brain Phantom
5. Clinical Patient Studies
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5) 24
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5) 25
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
Digital Brain Phantom - Quantitative Results
26
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
1. Flat Detector CT Perfusion
2. Digital Brain Perfusion Phantom
3. Reconstruction & Noise Reduction
4. Numerical Study: Digital Brain Phantom
5. Clinical Patient Studies
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
Patient Study with Head Motion
3 s zeego Acquisition
Patient image data by courtesy of Dr. Struffert and Prof.
Dörfler, Neuroradiology, Universitätsklinikum Erlangen
• 69 year old male
• Occlusion of the middle cerebral artery on the left
• The cerebral artery could be re-canalized successfully with self-
expanding stents
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
Patient Study with Head Motion
29
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5) 30
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
Patient Study with Pre and Post Treatment Scan
3 s zeego Acquisition
Patient image data by courtesy of Dr. Struffert and Prof.
Dörfler, Neuroradiology, Universitätsklinikum Erlangen
• 72 year female patient
• Occlusion left vertebral artery, including the posterior inferior cerebellar
artery
• The vertebral artery could be re-canalized successfully by mechanical
recanalization therapy
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5) 32
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5) 33
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
Patient Study with Pre and Post Treatment Scan
5 s bi-plane Acquisition
Patient image data by courtesy of Dr. Struffert and Prof.
Dörfler, Neuroradiology, Universitätsklinikum Erlangen
• 87 year female patient
• Occlusion of the right distal carotid artery
• The carotid artery could be recanalized successfully by mechanical
recanalization therapy
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
Flat Detector CT CBF & CBV Maps
35
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
Flat Detector CT MTT & TTP Maps Pre Treatment Post Treatment
36
MTT
TTP
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
Dynamic Angiography
37
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January, 20th 2014 | Michael Manhart | Pattern Recognition Lab (CS 5)
Summary & Outlook
● Interventional perfusion imaging with flat detector CT in clinical
practice is feasible
● FDK-SR-JBF approach for computational fast noise and streak
artifact reduction
● Outlook:
● Improved streak identification using pattern recognition approaches
● Online motion correction
● Advanced analytic reconstruction
● Further validation with patient studies
38