Quality Improvements for Multi-Modal Neuroimaging - PowerPoint PPT Presentation

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Quality Improvements for Multi-Modal Neuroimaging

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Quality Improvements for Multi-Modal Neuroimaging Mika Sepp Brain Research Unit / LTL AMI-Centre Helsinki University of Technology 1. Registration Match metric ... – PowerPoint PPT presentation

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Title: Quality Improvements for Multi-Modal Neuroimaging


1
Quality Improvementsfor Multi-Modal Neuroimaging
  • Mika Seppä
  • Brain Research Unit / LTL
  • AMI-Centre
  • Helsinki University of Technology

2
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3
3 central stages
1. Registration
2. Resampling
3. Visualization
4
1. Registration
  • Match metric
  • Single-modal registration
  • sum of squared differences
  • Multi-modal registration
  • mutual information

5
MI artifacts
  • Images aligned
  • Same pixel/voxel sizes
  • Registration bias
  • Local maxima
  • Continuous sampling
  • higher-order method

MI
offset (pixels)
6
2. Resampling
  • Very common operation
  • geom. correction, motion correction, group
    average etc.

...
15 x
SNR 10log10(?s2/?e2)
7
Two-stage resampling
SNR (dB)
Time (ms)
8
3. Visualization
800 fps
0.1-5 fps
120 fps
9
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Seppä (2007). On continuous sampling and
sub-sample accuracy in mutual-information
registration. TKK Report, TKK-KYL-017. Seppä
(2007). High-quality two-stage resampling for 3-D
volumes in medical imaging. Medical Image
Analysis, 11346-360. Seppä, Hämäläinen (2005).
Visualizing human brain surface from T1-weighted
MR images using texture-mapped triangle meshes.
NeuroImage, 261-12. Hiltunen, Suortti, Arvela,
Seppä, Joensuu, Hari (2005). Diffusion tensor
imaging and tractography of distal peripheral
nerves at 3 T. Clinical Neurophysiology,
1162315-2323.
13
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