Object ID: 00000018WIA30F58970GYZ
Topic ID: id_40023429 Version: 1.3
Date: Mar 28, 2022 3:52:38 PM

View Main EigenVector

About this task

Use these steps to magnify the ROI with a vector displayed in each pixel. The vector color represents the orientation of the white matter in that pixel. Correlate the vector color with the color guide box in the lower-right corner of the viewport.

Step-by-step instructions

From the Review Steps area, click Main EigenVector.

Figure 1. Review steps for FiberTrak protocol
From the Measure/Annotate toolbar, select an ROI.
Place the ROI on any orthogonal image that is either a DTI source, map or color orientation view.
- The line that appears in the ROI is the average of the orientations within the ROI.
- If desired, click and drag the ROI around the image.
Magnify the image to see the color orientation of the Main EigenVector.
- For details, see:
  - Change the image magnification or minification
  - Adjust the image Window Width and Level
    Figure 2. Main EigenVector display
- Below are examples of pixels within an ROI.
  Figure 3. Pixels from an ROI that is comprised of white matter tracts oriented in the sagittal direction
  - Some vectors are a combination of multiple orientations. For example, some vectors may be yellow indicating that the white matter represented in the pixel is oriented in both the Z and Y (blue + green = yellow) directions.
    Figure 4. Pixels from an ROI that is comprised of white matter tracts oriented in multiple directions illustrated by the mix of vector colors