Projects:RegistrationLibrary:RegLib C17

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v3.6.3 Slicer3-6Announcement-v1.png Slicer Registration Library Case #17:
Kidney pre-op MR to intra-op CT

Input

this is the fixed reference image. All images are aligned into this space lleft this is the moving image. The transform is calculated by matching this to the reference image
fixed image/target: intra-operative CT moving image: per-operative MRI

Modules

Keywords

CT, MRI, abdominal, image-guided therapy, IGT, tumor ablation

Input Data

  • fixed: intra-operative CT, oblique, 0.58 x 0.58 x 3 mm voxel size, dimensions 512 x 512 x 20
  • moving: opre-operative MRI lique, 1.2 x 1.2 x 4 mm voxel size, dimensions 320 x 240 x 64

Registration Challenges

  • intra-operative CT is acquired with limited FOV and very oblique position
  • intra-operative CT contains artifacts from surgical needles
  • both datasets have strong voxel anisotropy
  • the region of interest (kidney) is small compared to the FOV, i.e. there is substantial "distracting" image content

Key Strategies

  • manual alignment to obtain initial pose
  • rough segmentation of both kidneys to mask "distracting" image content
  • gradual increase in registration DOF.

Procedures

  • Phase 1: obtain masks for kidney ROI
  1. Use the Draw tool in the

Registration Results

original unregistered after manual initial alignment after rigid registration after affine registration

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