New Progresses of DTI-Map, a Program for DTI Computation and Fiber Tracking Hangyi Jiang, Peter van...
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Transcript of New Progresses of DTI-Map, a Program for DTI Computation and Fiber Tracking Hangyi Jiang, Peter van...
New Progresses of DTI-Map, a New Progresses of DTI-Map, a Program for DTI Computation and Program for DTI Computation and
Fiber TrackingFiber Tracking
Hangyi Jiang, Peter van Zijl, Susumu MoriHangyi Jiang, Peter van Zijl, Susumu Mori
Dept. of RadiologyJohns Hopkins UniversitySchool of Medicine F.M. Kirby Research Center
for Functional Brain Imaging
All-in-One StrategyAll-in-One Strategy
Integrating DTI computation, fiber tracking, 3D visualization, ROI drawing and statistic analysis all together;
Windows-style programming with user-friendly interface, most operations could be done just by few clicks;
Facility in Variety of ScannersFacility in Variety of Scanners
Philips Siemens GE Raw data etc.
Imaging Parameter Dialog
Smart dialogs for parameters input and verification
More options for better visualization or computation efficiency
Gradient table editor are introduced
DTI computation: one-click solution
DTI computation, Color Mapping, Anisotropy analysis, ADC map, fiber tracking etc. can be finished in few minutes just by one click
DTI Computation: tensor matrix
Dyy
Dxx
Dzz
Dxz
Dyz
Dxy
DzyDzx
Dyx
DTI Computation: other-results
Eigen Values Eigen Vectors Color Maps
FA
VR
RA
Primary Axis
2nd Axis
Shortest Axis
x y z
x y z
x y z
Anisotropy
DTI Computation: ADC map
Original Images(Multi-Scans)
ADC Map forevery gradient
Region of Interesting (ROI) Tools
Built-in ROI tools Variety drawing tools, 3D ROI displaying,
ROI combination makes complex-ROI drawing possible
Statistic analysis within ROIs for orthogonal views
ROI file management is available
ROI Tools: Interface
Statistics
Shapes
Operations
Files
Options
ROI Drawing Tools
Rectangle Polygon Ellipse
Multiple-ROI: Multiple Slices ROI (3D ROI):
Slice 120 Slice 121
Slice 123
Slice 124
ROI (Region Of Interesting) drawing tools
Different Shape:
Multiple ROIs operations
ROI - A
ROI - B Combination
A + B
A x B
A - B
AND
OR
NOT
OriginalResult
Fiber Tracking
Fiber tracking can be finished in a few minutes
Fiber selection by multi-ROIs combination
Visualization in 2D or 3D views
Fiber data file management is available
Fiber Tracking: Interface
ROI combination
Fiber selection
Fiber color assignment
ROI shape
display options
Fiber-ROI files
Fiber-ROI statistics
File commands
Fiber Tracking: visualization
Selected tracts can be displayed in 3D and 2D orthogonal viewssimultaneously using user assigned color.
Fiber Tracking: visualization
Selected tracts can also be displayed in 2D multi-slices mode.
Fiber Selection: by ROI combination
Fiber can be selected by multi-ROIs combinations such as AND, OR and NOT.This example shows the fibers passing through ROI-A but not ROI-B
ROI - A ROI - B
Fiber Selection: more details
Q: Why do we need it?A: Select (and visualize) the interested fibers within
the whole fiber data record
Intersection (AND) Union (OR)
ROI - AROI - B
ROI - A
ROI - B
Exclusion (NOT)
ROI - AROI - B
A B A B A - B
Fiber Tracking: Algorithm
•Basically, the algorithm is on FACT method (Mori et al, 1999)
•Tracking starts when FA > threshold
•Tracking stops when FA < threshold or tract changed its direction sharply
>70ºFA < 0.4
Visualization
Visualizing images in 2D-orthogonal views and 3D view
3D viewing direction changing freely Zoom in, zoom out interactively for 3D view Multi-slices image viewing, image scaling,
image data and profile viewing are available
Visualization: 3D and 2D views
Axial View
Coronal ViewSagittal View
3D View
Visualization: image level adjusting
Image level adjusting helps the users viewing the details more
Visualization: 3D view
3D-visualization:
– Interactively rotating, zooming and so on.
– Slice opacity is adjustable
– User-defined fiber color
– Synchronized with the
2D orthogonal slice views
Visualization: 3D image opacity
Adjustable image opacity makes see-through possible