SSA-FARY Gating without External Devicesmuecker1/2020-05-29_SSA-FARY.pdf · 2020. 9. 10. ·...
Transcript of SSA-FARY Gating without External Devicesmuecker1/2020-05-29_SSA-FARY.pdf · 2020. 9. 10. ·...
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SSA-FARYGating without External Devices
Sebastian RosenzweigDiagnostic and Interventional Radiology
University Medical Center Göttingen
May 29, 2020
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Challenges in Cardiac MRI
CARDIACMOTION
RESPIRATORYMOTION
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Challenges in Cardiac MRI
CARDIACMOTION
RESPIRATORYMOTION
ECG-gating
ECG
cardiac phases
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Challenges in Cardiac MRI
CARDIACMOTION
RESPIRATORYMOTION
ECG-gatingbreath-holds
breath-hold breath-hold
ECG
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TEMPORALINFORMATION
Challenges in Cardiac MRI
VOLUMETRICINFORMATION
frame-by-frame slice-by-slice
CARDIACMOTION
RESPIRATORYMOTION
ECG-gatingbreath-holds
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TEMPORALINFORMATION
Challenges in Cardiac MRI
VOLUMETRICINFORMATION
CARDIACMOTION
RESPIRATORYMOTION
multi-dimensional
device-freefree-breathing
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AC Region in Radial Imaging
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AC Region in Radial Imaging
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AC Region in Radial Imaging
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AC Region in Radial Imaging
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AC Region in Radial Imaging
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AC Region in Radial Imaging
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AC Region in Radial Imaging
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AC Region in Radial Imaging
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AC Region in Radial Imaging
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AC Region in Radial Imaging
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PCA
[1] Pang et al., Magn. Reson. Med. (2014)
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PCA
[1] Pang et al., Magn. Reson. Med. (2014)
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PCA
time
ampl
itude
ampl
itude
[1] Pang et al., Magn. Reson. Med. (2014)
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PCA
- incomplete separation- noisy
time
ampl
itude
ampl
itude
[1] Pang et al., Magn. Reson. Med. (2014)
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Rössler Attractor
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Time-Delayed Embedding
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Time-Delayed Embedding
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Time-Delayed Embedding
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Time-Delayed Embedding
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Basic Principle
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Basic Principle
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Basic Principle
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Basic Principle
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Basic Principle
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Basic Principle
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Basic Principle
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Basic Principle
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Basic Principle
time
ampl
itude
ampl
itude
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PCA vs. SSA-FARY
time
ampl
itude
timetime
ampl
itude
time
SSA-FARY1,2,3PCA
- incomplete separation- noisy- peak detection
+ clear separation+ intrinsic denoising+ phase preserving
[1] Rosenzweig et al, IEEE (2020) [2] Broomhead and King, Physica D (1986) [3] Vautard and Ghil, Physica D (1989)
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PCA vs. SSA-FARY
time
ampl
itude
timetime
ampl
itude
time
SSA-FARYPCA
timetimetimetime
- incomplete separation- noisy- peak detection
+ clear separation+ intrinsic denoising+ phase preserving
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PCA vs. SSA-FARY
time
ampl
itude
timetime
ampl
itude
time
SSA-FARYPCA
timetimetimetime
- incomplete separation- noisy- peak detection
+ clear separation+ intrinsic denoising+ phase preserving
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PCA vs. SSA-FARY
time
ampl
itude
timetime
ampl
itude
time
SSA-FARYPCA
timetimetimetime
- incomplete separation- noisy- peak detection
+ clear separation+ intrinsic denoising+ phase preserving
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Comparison
ECG
belt
Belt & diaphragm
Lung
Livertime
EOF R1 EOF R2 standard deviationfrom ECG trigger
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Image Reconstruction
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Image Reconstruction
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Image Reconstruction
RING1
gradient delayestimation
SSA-FARYbinning
[1] Rosenzweig et al., Magn. Reson. Med. (2018)
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Image Reconstruction
RING1
gradient delayestimation
SSA-FARYbinning
SMS-NLINV2
coil sensitivityestimation
[1] Rosenzweig et al., Magn. Reson. Med. (2018) [2] Rosenzweig et al., Magn. Reson. Med. (2017)
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Image Reconstruction
RING1
gradient delayestimation
SSA-FARYbinning
SMS-NLINV2
coil sensitivityestimation
MULTI-DIMENSIONAL REGULARIZATION3
Total-Variation constraint
cardiac dimension
resp
irato
ry d
imen
sion
[1] Rosenzweig et al., Magn. Reson. Med. (2018) [2] Rosenzweig et al., Magn. Reson. Med. (2017) [3] Feng et al., Magn. Reson. Med. (2015)
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Image Reconstruction
RING1
gradient delayestimation
SSA-FARYbinning
SMS-NLINV2
coil sensitivityestimation
MULTI-DIMENSIONAL REGULARIZATION1
Total-Variation constraint
[1] Rosenzweig et al., Magn. Reson. Med. (2018) [2] Rosenzweig et al., Magn. Reson. Med. (2017) [3] Feng et al., Magn. Reson. Med. (2015)
volume
cardiac dimension
resp
irato
ry d
imen
sion
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Single Slice
25 cardiac phases
end-inspiration end-expiration
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Single Slice
9 respiratory phases[interpolated]
end-systole end-diastole
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Stack-of-Stars
6 out of 14 slices
end-
expi
ratio
n
6 out of 14 slices
end-
expi
ratio
n
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Wrap Up
SUMMARY● time-delayed embedding + PCA● data-adaptive filtering
LIMITATIONS● arrhythmia● parameter dependence
OUTLOOK● high-resolution imaging● quantitative MRI
➔ denoising, separation & binning➔ device-free gating
https://github.com/mrirecon/ssa-fary