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dicom-viewer-mcp-app

mcp
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  • License — License: MIT
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  • process.env — Environment variable access in main.ts
  • process.env — Environment variable access in vite.config.ts
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SUMMARY

MCP app/server that renders local DICOM series into server-side PNG slices with window/level handling, then embeds an interactive viewer with slice navigation, zoom, pan, and metadata inside LLM chat clients.

README.md

DICOM Viewer MCP App

A prototype MCP (Model Context Protocol) App that displays DICOM medical images directly within LLM chat interfaces, including Claude Desktop. Built using the MCP Apps SDK.

DICOM Viewer Screenshot

Features

  • View DICOM medical images directly within Claude Desktop
  • Series navigation - browse through multiple slices with slider, buttons, or scroll wheel
  • Keyboard shortcuts - arrow keys for navigation, Home/End for first/last slice
  • Pan and zoom controls for image inspection
  • Displays image metadata (dimensions, bit depth, instance number)
  • Server-side rendering using dicom-parser and sharp
  • Handles DICOM window/level and rescale slope/intercept
  • Automatic sorting by Instance Number or Slice Location

How It Works

  1. The MCP server scans the ./dicom/ folder for all .dcm files
  2. Parses each DICOM file using dicom-parser
  3. Converts pixel data to PNG using sharp with proper windowing
  4. Sorts slices by Instance Number or Slice Location
  5. Embeds all images in the HTML resource sent to Claude Desktop
  6. The client displays images with interactive navigation controls

This approach avoids CSP (Content Security Policy) restrictions in Claude Desktop by doing all DICOM processing server-side.

Prerequisites

  • Node.js 18+
  • Claude Desktop with MCP support

Installation

# Clone the repository
git clone https://github.com/ThalesMMS/dicom-viewer-mcp-app.git
cd dicom-viewer-mcp-app

# Install dependencies
npm install

# Build the project
npm run build

Usage

1. Add your DICOM files

Place your DICOM files (.dcm) in the ./dicom/ folder:

./dicom/
├── IM-0001-0001.dcm
├── IM-0001-0002.dcm
├── IM-0001-0003.dcm
└── ...

2. Configure Claude Desktop

Add the server to your Claude Desktop configuration:

macOS: ~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "dicom-viewer": {
      "command": "node",
      "args": [
        "/absolute/path/to/dicom-viewer-mcp-app/dist/index.js",
        "--stdio"
      ]
    }
  }
}

3. Restart Claude Desktop

After updating the configuration, fully quit and restart Claude Desktop.

4. View DICOM images

Ask Claude to "show me a DICOM study" or "use the view-dicom tool".

Controls

Action Control
Navigate slices Scroll wheel, slider, or ◀/▶ buttons
Navigate slices (keyboard) Arrow keys (←/→ or ↑/↓)
First/Last slice Home / End keys
Zoom Ctrl + Scroll wheel, or +/− buttons
Pan Click and drag
Reset view Reset button

Development

# Build and run in development mode
npm start

# Or run with hot reload
npm run dev

Project Structure

dicom-viewer-mcp-app/
├── dicom/                  # Place DICOM files here (a single series)
│   └── .gitkeep
├── src/
│   ├── mcp-app.tsx        # React client component
│   ├── mcp-app.module.css # Styles
│   └── global.css
├── server.ts              # MCP server with DICOM processing
├── main.ts                # Entry point (stdio/HTTP transport)
├── mcp-app.html           # HTML template
├── package.json
└── README.md

Technical Details

DICOM Processing

The server handles:

  • 8-bit and 16-bit pixel data (signed and unsigned)
  • MONOCHROME1 and MONOCHROME2 photometric interpretations
  • Rescale slope and intercept transformations
  • Window center and window width adjustments
  • Automatic slice sorting by Instance Number or Slice Location

Supported DICOM Transfer Syntaxes

Currently supports uncompressed DICOM files (Explicit/Implicit VR Little Endian). Compressed transfer syntaxes (JPEG, JPEG 2000, etc.) are not yet supported.

Limitations

  • Uncompressed DICOM only (no JPEG/JPEG2000 compression)
  • All slices are loaded at once (may be slow for very large series)
  • Single series at a time

Citation

If you use this software, please cite it using the metadata in CITATION.cff:

Thales Matheus Mendonça Santos. DICOM Viewer MCP App. Version 1.0.0. 2026-06-08. https://github.com/ThalesMMS/dicom-viewer-mcp-app

Author

Thales Matheus Mendonça Santos - GitHub

License

MIT

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