Voyager Data Navigation
Region of Interest (ROI)
What an ROI is, when to use it, and how it improves alignment, resolution, and contrast in Voyager.
ROI (Region of Interest) lets you isolate and work on a focused subset of your scan. By defining an ROI, you can align geometry to a desired coordinate system, increase effective resolution via digital zoom, improve contrast by excluding irrelevant material, and even renormalize the volume to optimize downstream analysis.
If you’re looking for step-by-step instructions on creating an ROI, see the how-to guide:
Learn more: Renormalization in Voyager
Benefits of ROI
- Align the scan to a specific, user-defined coordinate system
- Enhance the effective resolution of critical areas via digital zoom
- Improve contrast by excluding high- or low-density materials outside your area of interest
- Renormalize your resulting volume to the region you care about
Alignment
Use ROI rotation and cropping handles to orient your part to your preferred axes. This helps standardize measurements and comparisons across projects.
- After alignment, dimensions and comparisons become more repeatable. See Inspection Planes for taking measurements once aligned.
Enhanced Resolution (Digital Zoom)
ROIs can increase effective resolution in the area you care about by reducing the working volume. This is especially helpful when inspecting fine details such as porosity or small features.
- For workflows that require tight dimensional accuracy on a local feature, consider pairing your ROI with ISO-50 Mesh + Dimensioning or CAD Comparison.
Enhanced Contrast
Exclude materials outside your area of interest to improve contrast on the features that matter. This can make visual inspection and downstream analysis clearer and faster.
- If you need to adjust material appearance further, explore Renormalization to remap intensity values on the ROI for better visibility of structures.
Renormalization
Renormalization can be applied to an ROI to adjust intensity mapping and highlight the density range you care most about. This is helpful when you want consistent visualization or to separate materials for analysis.
Learn more: Renormalization in Voyager
Best Practices
- Keep ROIs as tight as practical to maximize effective resolution and responsiveness
- Align before you crop tightly—orientation first, refinement second
- Name ROIs clearly; they nest under the parent reconstruction and are reused across workflows
- Use ROIs as inputs to recipes and analyses (e.g., porosity, inclusions, crack detection) to focus computations