NeurobookMind EEEA V6 · CT-Derived 3D Lab

A full fellowship built progressively

EEEA Curriculum Roadmap

Clinical cases come after mastery of spatial anatomy, imaging, approaches, instruments and reconstruction. Only the first advanced imaging laboratory is implemented in V5.

Current practical task: import an appropriately de-identified thin-slice skull-base CT, examine the sphenoid and carotid canals in MPR, then create a bone mesh centered on the sellar corridor.

Step 01 · Source data

Load high-resolution CT / MRI

The app processes files locally in Safari. Import a real CT volume in NIfTI (.nii / .nii.gz) or attached-data NRRD (.nrrd) format. CT and MRI remain independent until professionally registered.

▣ Import thin-slice CT◈ Import MRI

Window

No CT or MRI imported. The reconstruction panel will stay empty until a volume is loaded; synthetic QA is explicitly labeled.

Large-volume mode: preserves native CT samples for local ROI reconstruction and creates a memory-efficient preview for MPR. Original files are never changed.

AXIAL*—

Move slice / tap to relocate 3D ROI

CORONAL*—

Crosshair determines ROI center

SAGITTAL*—

Inspect sellar, clival boundaries

*Axis names are voxel-plane labels; NIfTI orientation transforms are reported but are not resampled to radiological orientation. Verify anatomical left/right and axis directions in a validated viewer before interpretation.

—Display voxel dimensions

—Voxel spacing (mm)

—Data source

Step 02 · CT surface reconstruction

Continuous 3D bone mesh · Marching tetrahedra

Real triangles are extracted from threshold-crossings in the loaded CT—not a point cloud. Rebuild at different thresholds and quality. This is a threshold-based surface, not verified anatomical segmentation; inspect all suspect defects in the original CT.

3D VIEW · WAITING FOR CTONE FINGER: ROTATE · PINCH: ZOOM · BUTTONS: ROTATE / RESET

ROI & extraction controls

Bone threshold (HU if calibrated)350

3D field of view (diameter)90 mm

Mesh detail / mobile load

Set the ROI center by tapping the relevant anatomy on the CT slices; the 3D reconstruction uses that point.

Reconstruction status

No scan selected. Load CT, set your ROI, then build.

ROI center: —

Requires real thin-slice bone-kernel CT. A coarse or thick-slice study cannot recover thin sphenoid septa or optic canal dehiscence. Thresholding alone may still create false holes; segmentation validation is mandatory.

Step 03 · Anatomical mastery

EEEA imaging objectives

These checkpoints must be identified on real imaging. No automatic identification is claimed.

Expert teaching notes

Step 04 · Assessment

Imaging quality and approach planning checkpoint

0 / 5

Evidence and limitations

What this workstation can and cannot do

Working now: local NIfTI / attached-data NRRD loading, genuine orthogonal voxel views, isosurface triangle generation from CT intensities, touch orbit, zoom, ROI controls, image-quality flags and structured expert checkpoints.

Not implemented: validated sphenoid, carotid canal, optic nerve or sellar segmentation; same-patient CT–MRI registration; surgical navigation; DICOM series decoding; automated surgical measurements. No high-resolution clinical CT is embedded in this package.

Privacy: do not upload identifiable patient data to Cloudflare or ChatGPT. This version processes locally selected files in your browser; use properly de-identified, permissioned teaching imaging only.

Imaging targets for serious EEEA fellowship

Thin-slice CT bone kernel, generally around 0.5–0.625 mm or better when available, plus dedicated contrast-enhanced 3D T1 MRI and appropriate vascular imaging for selected approaches. Compare MRI and CT only after accurate registration and visual verification.

Reference: 3D endoscopic navigation & skull-base CT reconstruction. Study uses 0.6 mm bone-kernel CT and separately segmented osseous, ICA and optic structures.

Dataset note: CT-SCOPE includes 0.47–1 mm sinus CT data, but the Zenodo files are currently restricted and cannot be shipped here. NasalSeg provides openly downloadable paranasal CT, but its reported 1.5 mm slice spacing is inadequate to validate fine dehiscence. NasalSeg · CT-SCOPE.

Do not mistake a visually smooth surface for surgical accuracy. Accurate 3D reconstruction requires validated imaging, correct geometry/orientation, quality-controlled segmentation, and expert anatomical review.

Image-derived skull-base anatomy, not a fabricated 3D skull.