1
Q
What and Why time series?
A
- image sequences
- some physiological processes can require more than static images to be analyzed (blood flow, motion of organ, contrast agent uptake)
2
Q
Perfusion Analysis
A
- plot intensity voxel over time to create an uptake curve
- correction for motion important because otherwise time curves mix different voxels
- motion correction
3
Q
Registration of time Series
A
- extension to image-to-image registration
- reference: single image, pairwise registration, global optimization (3d), synthetic reference
4
Q
relative and absolute transformations
A
- relative: transformation between time points
- absolute: transformation wrt reference time point
5
Q
propagation of uncertainty
A
- problem arises when chaning transformations
- how can it be reduced?
- minimize uncertainty in individual measurements
- correct transformation after propagating one step
- use an aggregated and regularized transformation
6
Q
Motion Analysis
A
- transformation express motion of structures in the image
- strain: deformation by force
- euler: look at spatial and what material passes through
- lagrangian: follow material point
7
Q
rigid and non rigid motion
A
- rigid: rotation & Translation
- non-rigid: scaling & shearing
