DICOM viewer · open source

Your scans in 2D, MPR and 3D.
Nothing to install.

CT, MR, X-ray and ultrasound straight from the CD, a folder, a ZIP file or the PACS. A single Slyced.exe of about 20 MB, from Windows 7 to 11. Or right in the browser.

Download for Windows Open in the browser

No scan at hand? Try it with a synthetic study →

Windows 7 · 8 · 10 · 11x64 · ARM64 · 32-bitWebGPU · WebGL2MIT or Apache 2.0
Slyced volume rendering
20MB

a single executable, no installer

4+ web

packages: x64, ARM64 and Windows 7 in 64 and 32 bits

7→11

from Windows 7 to Windows 11

0bytes

sent without you asking: no telemetry, no accounts

How it works

From slice
to volume.

Scroll down and see what Slyced does with a study.

  1. Hundreds of slicesA CT scan arrives as hundreds of DICOM images, each a thin slice of the body. Slyced reads folders, CDs with DICOMDIR and ZIP files without extracting them.
  2. Stacked into a volumeThe slices are sorted by their position in the patient and become a 3D volume in memory, ready to be resampled along any plane.
  3. Drawn by the graphics cardWGSL ray casting runs on the GPU (DirectX 12, Vulkan, OpenGL or WebGPU): VR, MIP, MinIP and surface, with realistic lighting.
Try it

Real MPR,
right here.

Axial, coronal and sagittal linked by a crosshair, as in Slyced. Drag on any plane and watch the other two follow.

AXIALAPRL
CORONALSIRL
SAGITTALSIAP

Window

A synthetic phantom computed right on this page, with skull, ventricles, contrast-filled vessels and a small lesion. In Slyced the same works on real studies, with MIP/MinIP slab, oblique planes and curved reformation.

drag moves the crosshair right button adjusts the contrast double click recenters
Slyced MPR with axial, coronal, sagittal and 3D views
Features

Made for people
who read scans.

From the hospital CD to the PACS, from measurements to comparison with the prior study: the everyday tools, with no sign-up and nothing to install.

Study comparison

Current and prior side by side, blended, with a swipe divider or as a checkerboard, aligned automatically (by frame of reference, landmarks or mutual information), with the change in each measurement as a percentage.

Study comparison with the swipe view in Slyced

Built-in PACS

C-FIND, C-GET and C-MOVE with a built-in receiver, or DICOMweb. Download queue, automatic cleanup and a timeline with every study of the patient.

Slyced PACS window

3D on the graphics card

VR with presets (bone, angio, skin, lung…), MIP, MinIP and surface; cropping and simple, realistic or cinematic lighting.

Volume rendering in Slyced

MPR and CPR

Slab with MIP, MinIP or average, oblique planes and a tube tracker for appendix, ureter, bile duct and vessels.

Measurements

Distance, angle, elliptical ROI, density in HU with the likely tissue, and volume from three diameters.

CT reading aids

Highlights for free air, mesenteric fat and stones; phases with and without contrast (ΔHU and subtraction) and an incisional hernia calculator.

Opens everything

Folders, CDs/DVDs with DICOMDIR and ZIP files without extracting. JPEG (12-bit, lossless, arithmetic), JPEG-LS, JPEG 2000, RLE, multiframe and color.

Full-screen reading

F11 leaves only the image; the controls come back when the mouse moves. Dark, light or high-contrast themes.

Truly portable

Runs from the download or a USB stick: no installer, no administrator rights, no Visual C++ Redistributable.

Privacy

The study never leaves
the computer.

  • No telemetry, no accounts and no automatic update checks.
  • Only talks to your PACS, the one you set up, and only when you search or download a study.
  • In the browser too: the web version reads the files on your computer and never uploads them.
  • Open source: anyone can check what the program does.
Technology

Made in Rust,
from file to pixel.

The same code becomes the Windows executable and the WebAssembly of the web version. Slices are read in parallel, and everything 3D is drawn by the graphics card.

Folder · CD · ZIPDICOMDIR PACSDIMSE · DICOMweb dicom-rsheaders · pixels Volumerayon · 16-bit wgpu · WGSLray casting ScreenDX12 · Vulkan · WebGPU
src/jobs.rs

      

      

        
Rustsafe and fast, no garbage collector

        
egui · eframeinterface drawn every frame

        
wgpu · WGSLDirectX 12, Vulkan, OpenGL and WebGPU

        
dicom-rsDICOM parsing and codecs

        
rayonslices decoded in parallel

        
WebAssemblythe same code, in the browser

      

    

  







  

    

      Download
      
Unzip and run.
Done.

      
Pick the package for your Windows on the latest release page, or use the web version with nothing to download.

    

    

      x64Windows 10 and 11, Intel or AMD (almost every PC)Slyced-‹version›-x64.zip
      ARM64Windows 10 and 11 on SnapdragonSlyced-‹version›-arm64.zip
      Win 7 · 64Windows 7 SP1, 8 and 8.1, 64-bitSlyced-‹version›-win7-x64.zip
      Win 7 · 32Windows 7 SP1, 8 and 8.1, 32-bitSlyced-‹version›-win7-x86.zip
      BrowserExperimental web version: no PACS yetcrie-studio.github.io/slyced/app
    

    
The packages are not digitally signed yet: if Windows shows “Windows protected your PC”, click More info → Run anyway. Check the file against the release's SHA256SUMS.txt. Details in the manual (Portuguese).

  







  

    

      FAQ
      
Frequently asked
questions.

    

    

      
How do I open a CT or MRI CD on my computer?
Download Slyced, extract it and run Slyced.exe. Click Open folder and pick the CD drive, or drag the CD folder onto the window: it finds the DICOMDIR and lists the studies, with nothing to install. Without a CD drive, copy the disc to a USB stick or a ZIP file, which Slyced opens without extracting.

      
Is there a free DICOM viewer that runs on Windows 7?
Yes. Slyced has packages for Windows 7 SP1, 8 and 8.1, 64-bit and 32-bit, as well as Windows 10 and 11 (x64 and ARM64). It is free and open source.

      
Can I view DICOM files in the browser without installing anything?
Yes, with the experimental web version. Files are read by the browser itself and never uploaded to any server. It does not support PACS or JPEG-LS yet.

      
Does Slyced send my studies anywhere?
No. There is no telemetry, no account and no automatic update check. The program only connects to the PACS servers you set up, and only when you search or download a study.

      
Which studies and formats does Slyced open?
CT, MR, X-ray and ultrasound DICOM files from folders, CDs/DVDs with DICOMDIR and ZIP files. It reads uncompressed images and JPEG (including 12-bit and lossless), JPEG-LS, JPEG 2000 and RLE, multiframe and color.

      
Does Slyced do MPR and 3D?
Yes: axial, coronal and sagittal MPR with oblique planes and slab (MIP, MinIP or average), curved planar reformation (CPR) and GPU volume rendering with VR, MIP, MinIP and surface modes.

      
Is Slyced available in English?
Yes. The interface is in English and Brazilian Portuguese: it follows the language of Windows (or of the browser, in the web version) and can be changed at any time in Settings → Appearance. The user manual is in Portuguese for now.

      
Can I use Slyced for diagnosis?
Slyced is not certified as a medical device (ANVISA, FDA or CE). Use it to view and study images, not as the sole basis for a diagnosis.

    

  







  

    

      Credits
      
Who made it
and with what.

    

    

      

        
        
Luiz Felipe Pitzer

        
Creator and developer of Slyced, from the idea to the interface and the code.

        lfp.app.br
          
        

          This page and parts of the code were made with Claude Opus 5.5, by Anthropic.

      

      

        
Built with

        
      

      

        
Inspiration

        
    
          
  • RadiAnt · Horos · Weasis
    • 
          
  • OHIF · 3D Slicer (VR presets)
    • 
        

        
Images

        
    
          
  • Screens and animations use synthetic studies made by the project itself. No patient images.
    • 
        

        
License

        
      

    

    

      Not certified as a medical device (ANVISA/FDA/CE). Do not use it as the sole basis for a diagnosis.