Roadmap

Completed ✓

• [x] NIfTI loading with orientation correction (SimpleITK)
• [x] DICOM series loading sorted by ImagePositionPatient
• [x] Three synchronized MPR planes — Axial · Coronal · Sagittal
• [x] Draggable crosshairs (InfiniteLine(movable=True))
• [x] Hollow circle at crosshair intersection (ScatterPlotItem)
• [x] Click-to-jump crosshair
• [x] Per-plane W/L sliders (Window width + Window level)
• [x] Per-plane colormaps (9 options each)
• [x] Per-plane cine playback at 20 fps with independent play/pause
• [x] Freehand annotation with yellow strokes
• [x] Clear annotations per plane
• [x] Export annotated viewport as PNG
• [x] Embedded VTK GPU volume rendering as 4th viewport
• [x] Transfer function presets: mri_default · bone · angio · pet
• [x] Background loading with QThread
• [x] LRU slice cache (36 slots) + neighbor prefetch
• [x] Physical voxel spacing applied to aspect ratio
• [x] Dark / light mode with system preference detection

Planned — short term

• [ ] Pixel value readout on hover
• [ ] Keyboard shortcuts (L=load, R=reset, P=play, 1/2/3=focus plane)
• [ ] DICOM metadata panel (acquisition parameters, anonymised)
• [ ] Screenshot export button in TopBar (current view as PNG)
• [ ] Measurement ruler — distance in physical mm

Planned — longer term

• [ ] Segmentation overlay — blend a mask NIfTI over anatomy
• [ ] 4D NIfTI support — fMRI timeseries playback
• [ ] Oblique slicing — arbitrary angle through the volume
• [ ] ROI drawing with intensity statistics
• [ ] Batch export — all slices of a plane as PNG sequence

Will not implement

• PACS networking — out of scope for a local desktop viewer
• Diagnostic reporting — teaching/research tool only, not for clinical diagnosis

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