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Dual-Modality X-Ray-Induced Radiation Acoustic and Ultrasound Imaging for Real-Time Monitoring of Radiotherapy.

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This study introduces a new dual-modality imaging system combining X-ray-induced radiation acoustic imaging (xRAI) and ultrasound (US) for real-time radiotherapy guidance. The system precisely tracks tumor motion, improving treatment accuracy and reducing side effects.

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Area of Science:

  • Medical Physics
  • Biomedical Imaging
  • Radiotherapy Technology

Background:

  • Radiotherapy precision is limited by internal body motion, affecting tumor targeting and normal tissue sparing.
  • Real-time monitoring of tumor and surrounding tissue movement is crucial for adaptive radiotherapy.
  • Existing imaging methods may not provide sufficient real-time feedback on radiation dose deposition during treatment.

Purpose of the Study:

  • To evaluate the feasibility of a dual-modality X-ray-induced radiation acoustic imaging (xRAI) and ultrasound (US) system for real-time image-guided radiotherapy.
  • To assess the system's ability to monitor geometric and morphological misalignments of the radiation field.
  • To improve radiotherapy accuracy and minimize side effects by tracking organ motion.

Main Methods:

  • An integrated xRAI and B-mode US dual-modality system was developed on a clinical research ultrasound platform.
  • The system's performance was validated using phantoms, ex vivo, and in vivo rabbit liver models.
  • Experiments involved switching between xRAI and US imaging modes to assess spatial resolution and frame rates.

Main Results:

  • The dual-modality system achieved spatial resolutions of 1.1 mm for xRAI and 0.37 mm for US.
  • xRAI required 300x signal averaging for a good signal-to-noise ratio, with a frame rate of 1.1 Hz.
  • Ultrasound imaging provided a real-time frame rate of 22 Hz, suitable for monitoring internal body motion.

Conclusions:

  • The developed xRAI and US imaging combination enables real-time in vivo mapping of radiation dose deposition during radiotherapy.
  • This US-based image-guided radiotherapy system offers significant potential for personalized cancer treatment.
  • The technology can enhance tumor eradication while limiting damage to surrounding healthy tissues.