2011 Summer Project Week NerveSeg

Nerve Segmentation

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  Projects List

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  Figure 1 - Example of Manual Nerve Segmentation

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  Figure 2 - Example of results so far.

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  Figure 3 - Example of results so far (slicer).

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  Figure 4 - Example of automatic segmentation on Thursday afternoon for multiple nerves.

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  Figure 5 - Complete render of nerve segmentations.

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  Figure 6 - Another View.

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  Figure 7 - View of another

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  Figure 8 - Map with impinging disc.

Key Investigators

• MIT: Adrian Dalca, Polina Golland
• BWH: Giovanna Danagoulian, Ehud Schmidt
• SPL: Ron Kikinis

Objective

We are developing a nerve segmentation algorithm for the automatic isolation of nerves and nerve ganglia inside the spinal sack and out through the vertebrae in new MR Myelography images. Current progress can track the core of a Nerve, and we are working on fully segmenting the edges.

Approach, Plan

Currently we use a particle-filter tracking approach for segmenting the nerves. The algorithm is given a seed point, preferably somewhere in the spine. The particles are tubes following Bézier curves (and hence forming a B-spline track). The dynamics model encourages continuity and smoothness. The image likelihood model compares gradient fields and intensities of predicted patches with image observations to evaluate a posterior distribution of the particles' importance. While we can currently usually track the nerve cores, usually fully throughout the vertebral canal, the algorithm does not delineate the full extent of the nerves. We will focus on achieving this during the project week.

Progress