ssa-fary gating without external devicesmuecker1/2020-05-29_ssa-fary.pdf · 2020. 9. 10. ·...
TRANSCRIPT
1
SSA-FARYGating without External Devices
Sebastian RosenzweigDiagnostic and Interventional Radiology
University Medical Center Göttingen
May 29, 2020
SSA-FARY
2
Challenges in Cardiac MRI
CARDIACMOTION
RESPIRATORYMOTION
SSA-FARY
3
Challenges in Cardiac MRI
CARDIACMOTION
RESPIRATORYMOTION
ECG-gating
ECG
cardiac phases
SSA-FARY
4
Challenges in Cardiac MRI
CARDIACMOTION
RESPIRATORYMOTION
ECG-gatingbreath-holds
breath-hold breath-hold
ECG
SSA-FARY
5
TEMPORALINFORMATION
Challenges in Cardiac MRI
VOLUMETRICINFORMATION
frame-by-frame slice-by-slice
CARDIACMOTION
RESPIRATORYMOTION
ECG-gatingbreath-holds
SSA-FARY
6
TEMPORALINFORMATION
Challenges in Cardiac MRI
VOLUMETRICINFORMATION
CARDIACMOTION
RESPIRATORYMOTION
multi-dimensional
device-freefree-breathing
SSA-FARY
7
AC Region in Radial Imaging
SSA-FARY
8
AC Region in Radial Imaging
SSA-FARY
9
AC Region in Radial Imaging
SSA-FARY
10
AC Region in Radial Imaging
SSA-FARY
11
AC Region in Radial Imaging
SSA-FARY
12
AC Region in Radial Imaging
SSA-FARY
13
AC Region in Radial Imaging
SSA-FARY
14
AC Region in Radial Imaging
SSA-FARY
15
AC Region in Radial Imaging
SSA-FARY
16
AC Region in Radial Imaging
SSA-FARY
17
PCA
[1] Pang et al., Magn. Reson. Med. (2014)
SSA-FARY
18
PCA
[1] Pang et al., Magn. Reson. Med. (2014)
SSA-FARY
19
PCA
time
ampl
itude
ampl
itude
[1] Pang et al., Magn. Reson. Med. (2014)
SSA-FARY
20
PCA
- incomplete separation- noisy
time
ampl
itude
ampl
itude
[1] Pang et al., Magn. Reson. Med. (2014)
SSA-FARY
21
Rössler Attractor
SSA-FARY
22
Time-Delayed Embedding
SSA-FARY
23
Time-Delayed Embedding
SSA-FARY
24
Time-Delayed Embedding
SSA-FARY
25
Time-Delayed Embedding
SSA-FARY
26
Basic Principle
SSA-FARY
27
Basic Principle
SSA-FARY
28
Basic Principle
SSA-FARY
29
Basic Principle
SSA-FARY
30
Basic Principle
SSA-FARY
31
Basic Principle
SSA-FARY
32
Basic Principle
SSA-FARY
33
Basic Principle
SSA-FARY
34
Basic Principle
time
ampl
itude
ampl
itude
SSA-FARY
35
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)
SSA-FARY
36
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
SSA-FARY
37
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
SSA-FARY
38
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
SSA-FARY
39
Comparison
ECG
belt
Belt & diaphragm
Lung
Livertime
EOF R1 EOF R2 standard deviationfrom ECG trigger
SSA-FARY
40
Image Reconstruction
SSA-FARY
41
Image Reconstruction
SSA-FARYbinning
SSA-FARY
42
Image Reconstruction
RING1
gradient delayestimation
SSA-FARYbinning
[1] Rosenzweig et al., Magn. Reson. Med. (2018)
SSA-FARY
43
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)
SSA-FARY
44
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)
SSA-FARY
45
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
SSA-FARY
46
Single Slice
25 cardiac phases
end-inspiration end-expiration
SSA-FARY
47
Single Slice
9 respiratory phases[interpolated]
end-systole end-diastole
SSA-FARY
48
Stack-of-Stars
6 out of 14 slices
end-
expi
ratio
n
6 out of 14 slices
end-
expi
ratio
n
SSA-FARY
49
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