2012 Summer Project Week:Interactive Needle Segmentation
Screenshot of Manual Needle Segmentation (20 minutes)
Screenshot of Single Needle Modeled With Tractography Fiducial Seeding Module
Screenshot of Multiple Needles Modeled With Tractography Fiducial Seeding Module (Hessian Image Visible)
Key Investigators
- Rutgers: Nabgha Farhat
- BWH: Yi Gao, Neha Agrawal, Nabgha Farhat, Jan Egger, Tina Kapur
- Isomics: Steve Pieper
Objective
The goal of this project is to achieve fast (< 2 minute) interactive segmentation of 5-10 needles from MRI images using Slicer.
Approach, Plan
We will explore different segmentation/editing tools in Slicer to determine which ones can most efficiently segment 2mm needles (10-15 cm long), from MRI scans in which voxels are about 2mm in each dimension. (These needles are not straight lines, and are often placed within a few mm of each other.)
Progress
Needles were effectively modeled from pelvic MRI scans using the Tractography Fiducial Seeding module:
- Scans were cropped to the region of interest
- Hessian images were generated from this data
- Fiducials were placed in regions known to be part of a needle
- The Tractography Fiducial Seeding module was used to generate “tracts” that pass through the fiducial – in this case, the needles
Refinements need to be made to optimize the modeling for brachytherapy needles rather than fiber bundles:
- A sense of “momentum” is needed, so that needles do not abruptly end or change direction in signal voids
- Existing needle and template models (eg, from iGyne) may also be incorporated
Delivery Mechanism
N/A
