Lumen — DICOM viewer
No in-app products collected for this app.
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Description
Lumen opens the radiology zip your patient brought in. No upload, no cloud, no signup — just pixels, at native resolution, on every Apple device you own.
Designed for healthcare professionals reviewing studies they already have authority to access. Lumen is positioned for education, case review, and second-read scenarios. It is NOT a medical device and is not intended for primary clinical diagnosis.
WHAT YOU CAN OPEN
DICOM / IHE-PDI zip archives — the format most patient CDs ship as
ISO 9660 disk images directly, no manual mount or repackage needed
Folders of DICOM files
Open via Files.app, share sheet, or in-app picker
PERSISTENT LIBRARY
Every imported archive lives in your device's Lumen folder, visible in the Files app
Re-open with one tap from the home screen; no re-importing
Swipe to delete an archive — and all the videos exported from it
VIEWING
Full native bit-depth display, with pinch zoom, drag pan, and double-tap toggle
Window/level by drag: vertical for brightness, horizontal for contrast — sensitivity scales with the active window so wide CT and narrow brain windows feel equally responsive
One-tap modality presets (CT: soft tissue, bone, lung, brain, abdomen, liver)
Per-instance metadata sheet with manufacturer, matrix, bit depth, transfer syntax, SOP class, and a built-in radiology acronym glossary
VOLUMETRIC TOOLS
Automatic detection of stackable volumes from the slice geometry tags, with a 3D / 4D badge in the browser so you can see at a glance which series are reconstructable
Multi-planar reconstruction (MPR): axial, sagittal, and coronal reformats side by side, with crosshair-linked navigation — tap one plane to jump the other two
Slab projection: maximum-intensity (MIP), minimum-intensity (MinIP), or average over 3 to 50 slices — great for vessels, lungs, and noise reduction
True 3D volume rendering: a Metal-powered raycaster with four rendering modes — Surface (solid skin/bone shell with gradient lighting and per-volume tone presets), Anatomy (coloured tissue transfer function), Volume composite (grayscale translucent depth), and MIP
Tissue isolation presets per modality (bone, skin, soft tissue, lung, liver) — hide everything else from the volume with one tap, no per-slice masking
Two-finger pan, drag-rotate, pinch-zoom, auto-rotate cine, and an axis-aligned clipping plane (sagittal / coronal / axial) for cutting away half the volume to see inside
Save the current 3D view as a PNG snapshot at 2× the on-screen resolution, sharable via Photos, AirDrop, Files, or Mail
DYNAMIC 4D ACQUISITIONS
Native support for dynamic contrast-enhanced series (e.g. dyn_eTHRIVE liver MR, perfusion MR, dynamic angio): every timepoint becomes its own 3D volume
Timepoint slider in MPR and 3D with cine playback — watch contrast wash through over time
All timepoints prefetched in the background and persisted to an on-device cache, so scrubbing across timepoints stays instant across launches
PERFORMANCE
Two-tier volume cache (memory + on-device disk) — reopening MPR or 3D for a series you've already seen skips the multi-second DICOM decode entirely
Series probe results cached per archive so the browser opens instantly even on dynamic studies with thousands of files
Half-float Metal texture upload halves GPU memory and bandwidth — lossless for the modalities Lumen handles
SHARING
Export any series as an H.264 MP4 at 10, 15, or 30 fps
Saved next to its source archive in the Lumen folder of Files.app
Share via the standard share sheet, or copy to iCloud Drive
PNG snapshots of the 3D view share
PRIVACY BY DEFAULT
Everything stays on this device
No analytics on file contents, no account, no tracking SDKs
Patient data leaves the device only when YOU choose to share an export
Lumen is intentionally positioned as an educational and second-read tool. It is not a regulated medical device in any jurisdiction. See the in-app disclaimer for the full statement.