Motion encoding and analysis

Motion encoding
and analysis
Institute for
f Biomedical
d l Engineering
University and ETH Zurich
Switzerland
3D Tagging
Tagging preparation
3D Tagging
Tagging*))
*) A. Rutz, S. Ryf
3D Tagging
Maximum relative contraction (2nd principal strain)
Healthy subject
anterior
Rutz AK et al. MRM 2008
Posterior infarction
lateral
anterior
lateral
Diffusion Tensor Mapping – In-vivo
1. Local Look
2. Bipolar
p
Diffusion encoding
g
M
P
S
RF o
90
3. Respiratory selfself-gating
Gamper U et al. MRM 2007
180o
Diffusion Tensor Mapping – In-vivo
In--vivo human heart
In
Gamper U et al. MRM 2007
o
o
o
o
o
o
Resolution 2.2 x 2.2 x 6 mm3
Trigger delay ~70% end systole
TR = 2 R-R Intervals
TE = 67 ms
b = 350 s/mm2
NSA ~ 15 images
Velocity encoding – aortic valve flow
MRI + CFD
Native valve
Artificial valve
Navier-Stokes
Navier
Stokes + ALE + Finite element solver
Leuprecht A, et al. Biorheology 2002
Valvular flow and shear stresses
Native valve
Leuprecht A, et al. Biorheology 2002
Artificial valve
Multi-directional velocity encoding
Navigated, retrospectively triggered 3D phase-contrast*
ECG
HP
NAV
HP
HP
HP
HP
HP
HP
HP
HP
NAV
vy
Comp
+Vx +Vy +Vz
vx
vz
Multi-directional flow visualization
GTFlow by GyroTools Ltd,
Ltd Switzerland
Acknowledgements
University and ETH Zurich
x
x
x
x
Andrea Rutz
Urs Gamper
Jochen von Spiczak
Peter Boesiger
GyroTools Ltd
x
Gerard Crelier
Funding
SEP,, ETH Zurich
S
u c
KTI/CTI
Philips Medical Systems