Measure Tab Overview
The Measure ribbon tab provides tools for quantitative analysis of project data, including point-based measurements, geometric primitives, statistical analysis of volumes and masks, mesh quality evaluation, and report generation. These tools enable precise dimensional analysis, data characterization, and quality assessment across all data types in Volvicon.
The Measure tab is organized into logical sections based on data type. Start with Measurement Tools for basic distance and angle measurements, then use Statistics tools for in-depth analysis of volumes, masks, and meshes.
Tab Structure
The Measure tab organizes its functionality into four main sections:
Measurement Tools
Tools for creating and managing point-based measurements:
| Tool | Description |
|---|---|
| Measurements | Add geometric measurements such as points, distances, angles, diameters, and contours |
| Histogram | Generate histograms of grayscale values from volume datasets |
| Draw Profile Line | Visualize intensity profiles along user-defined lines |
The interactive gray value histogram, which configures opacity, color, and isosurface rendering, is on the Render page of Render Properties in the Image tab.
Shared Reference
| Page | Description |
|---|---|
| Interactive Histogram Chart | Reading, navigating, and evaluating the distribution chart used by the histogram and statistics tools |
Primitive Tools
Tools for creating and analyzing geometric primitives:
| Tool | Description |
|---|---|
| Primitives | Create geometric primitives such as planes, spheres, cylinders, and cones |
| Primitive Fitting | Automatically fit primitives to point clouds or surface geometry |
| Measurement between Primitives | Measure distances and angles between primitive objects |
Statistics
Tools for statistical analysis of data objects:
| Tool | Description |
|---|---|
| Volume Statistics | Calculate grayscale statistics and histograms for volume datasets |
| Volume Similarity Statistics | Compare similarity metrics between two volume datasets |
| Mask Statistics | Analyze whole mask, per-region, and per-label statistics |
| Compare Masks | Calculate overlap statistics between two masks |
| Surface Statistics | Report mesh statistics for surfaces |
| Volume Mesh Statistics | Report mesh statistics for volume meshes |
Analysis
Tools for advanced visualization and quality analysis:
| Tool | Description |
|---|---|
| Slice Analyzer | Visualize slice gray values as a 3D surface with false-color enhancement |
| Mesh Quality Analyzer | Analyze and visualize mesh element quality for surfaces and volume meshes |
Common Concepts
Measurement Types
The Measurements tool supports several geometric measurement types:
| Type | Description | Coordinates |
|---|---|---|
| Point | Single 3D coordinate | P1 (X, Y, Z) |
| Distance | Linear distance between two points | P1, P2 |
| Angle | Angle formed by three points | P1, P2, P3 (vertex at P2) |
| Diameter | Diameter measurement at a point | P1, P2, P3 |
| Contour | Perimeter and area of a closed or open curve | Multiple points |
| Circle | Circular annotation with radius | Center + radius |
| Ellipse | Elliptical annotation | Center + axes |
| Rectangle | Rectangular annotation | Corner + dimensions |
| Box | 3D box annotation | Origin + dimensions |
| Caption | Text annotation at a 3D position | P1 |
Primitive Types
Primitives are idealized geometric shapes used for reference and measurement:
| Type | Description |
|---|---|
| Plane | Infinite flat surface defined by a point and normal vector |
| Sphere | Ball defined by center and radius |
| Cylinder | Circular tube defined by axis and radius |
| Cone | Conical surface defined by apex, axis, and angle |
| Circle | Planar circle defined by center, normal, and radius |
| Point | Single reference point in 3D space |
| Line | Line defined by two points or point and direction |
Statistics Metrics
Statistical analysis tools report various metrics depending on the data type:
Grayscale Statistics (Volumes)
| Metric | Description |
|---|---|
| Mean gray value | Average gray value |
| Median gray value | Middle value when sorted |
| Std. dev. of gray values | Measure of gray value variation |
| Variance | Square of the standard deviation |
| Min. gray value / Max. gray value | Gray value range |
| Voxel count | Number of voxels analyzed |
| Volume (mm³) / Volume fraction (%) | Size of the analyzed region |
| Skewness, Kurtosis, RMS, Uniformity, Entropy | Distribution shape metrics |
| 5% to 95% quantile values | Gray value percentiles |
See Volume Statistics for the full list.
Shape Statistics (Masks)
| Metric | Description |
|---|---|
| Volume (mm³) | Physical volume of the region |
| Surface area (mm²) | Boundary surface area |
| Diameter X/Y/Z (mm) | Oriented bounding box dimensions |
| Centroid X/Y/Z (mm) | Center of mass position |
| Sphericity, Compactness, Elongation, Flatness | Shape descriptors |
See Mask Statistics for the full list.
Mesh Statistics (Surfaces/Volume Meshes)
| Metric | Description |
|---|---|
| Points | Total vertex count |
| Cells | Total element count (triangles or tetrahedra) |
| Area / Volume | Total surface area or enclosed volume |
| Bounds | Spatial extent in X, Y, Z |
Report Generation
Analysis results from the Measure tab can be exported for documentation and quality control:
- Export to file: Save statistics tables as CSV or text files
- PDF Reports: Generate formatted reports with measurements, statistics, and snapshots using the PDF Report dialog
Scripting Support
Measurement and primitive operations can be automated using Python scripting. See the API documentation:
Related Resources
- Understanding Measurements - Fundamental concepts about measurements
- Understanding Primitives - Working with geometric primitives
- Understanding Masks - Mask statistics and analysis concepts
- PDF Report Generation - Exporting measurements and statistics to PDF