VOLUMETRIC RECONSTRUCTION LABORATORY

The Voxel Lab

How does a stack of flat medical tomographic images become a continuous 3D geometric surface? Using the NLM Visible Human Project's 0.33mm isotropic cubic-voxel datasets, The Voxel Lab demonstrates the bridge between discrete 3D scalar fields, Marching Cubes isosurface extraction, and C² quad subdivision limit surfaces.

Signature Interactive Instrument · 05

The Voxel Lab

Tomography Volumetrics → Marching Cubes Isosurface → Quad Remeshing

AXIAL SLICE (Z-AXIS):Slice #240 / 480 (0.333mm pitch)

HOUNSFIELD / DENSITY THRESHOLD:Threshold: 300 HU

Full Cranial Anatomy at 0.33mm Isotropic Spacing

Isotropic Voxel Grid: 512 × 512 × 480 voxels · 12-bit Hounsfield (CT)

ISOSURFACE DENSITY TIERS

Anatomical Tissue Tiers

Cortical & Trabecular Bone300 HU

Mandibular condyles, zygomatic arches, and cranial sutures. (2,450,000 tris)

Cerebral Soft Tissue & Muscle40 HU

Cerebral cortex gyri, temporalis muscle, and tongue volume. (4,890,000 tris)

External Epidermal Skin Boundary-200 HU

Continuous facial silhouette and external ear cartilage. (1,820,000 tris)

Reconstruction Pipeline:

1. Axial Slice Stacking: Volumetric Bilinear Resampling

2. Hounsfield Unit Thresholding: Otsu Dual-Threshold Segmentation

3. Marching Cubes Triangulation: Lorensen-Cline Isosurface Extraction

4. Quad Retopology & Limit Smoothing: Instant Meshes Field-Aligned Quad Remeshing

VERIDIANUM · ACCOUNTABILITY WIRE

Biomedical Tomography & Anatomical Data Provenance