Photon TG-51 Calculator – Automated Linac Output Calibration & QA

Simplify photon beam output calibration calculations with a dedicated, locally hosted TG-51 web application.

Designed for medical physicists, this application streamlines reference dosimetry calculations for both flattened and flattening-filter-free (FFF) photon beams, following the AAPM TG-51 protocol and the 2014 photon addendum.

Whether you're performing annual linac calibration, reviewing measurement data, or teaching TG-51 dosimetry, this tool provides a convenient interface for calculations, documentation, and historical measurement review.

✨ Key Features

🔬 Automated TG-51 Calculations

• Calculate absorbed dose to water using the TG-51 formalism.
• Apply temperature-pressure (Ptp), polarity (Ppol), ion recombination (Pion), and electrometer (Pelec) corrections.
• Calculate beam-quality conversion factors (kQ).
• Support flattened and FFF photon beams.

⚡ Flexible Reference Dosimetry Setup

• Support SAD-based photon reference measurements.
• Select PDD- or TMR-based beam-quality workflows.
• Automatically use the appropriate calculation tables based on the selected measurement method.
• Enter ion chamber calibration and measurement parameters through an intuitive interface.

📊 Output Verification and QA

• Calculate photon reference dose and output.
• Compare measured output against expected values.
• Display percentage differences for efficient QA review.
• Review calculation details and intermediate correction factors.

💾 Local Database and Measurement Records

• Save calibration measurements and calculation results.
• Maintain historical records for reference and comparison.
• Store data locally without requiring a cloud-based service.
• Support organized annual QA documentation.

💻 Local Web Application

• Run the application on your own computer.
• Access the interface through a web browser.
• No external server or cloud account required.
• Source code can be reviewed and customized for institutional workflows.

👩‍⚕️ Who Is This For?

• Therapeutic medical physicists
• Medical physics residents and students
• Radiation oncology departments
• Clinical educators
• Physicists developing automated QA workflows

📦 What's Included?

• Photon TG-51 web application source code
• Local application setup instructions
• Database setup guidance
• Example measurement data for demonstration and testing

📚 Technical Reference

The application implements photon reference dosimetry calculations based on:

• AAPM TG-51 (1999): Clinical Reference Dosimetry of High-Energy Photon and Electron Beams
• AAPM TG-51 Photon Addendum (2014)

⚠️ Important Disclaimer

This software is provided as an educational, research, and independent calculation-support tool. It is not an FDA-cleared medical device and has not been independently validated for clinical use at your institution.

Users are responsible for verifying all calculations, beam-quality corrections, measurement conventions, and results against applicable protocols and independently validated clinical procedures before relying on them for clinical decisions.

Make TG-51 calculations more efficient, transparent, and reproducible.