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Ultrasonography is an imaging technique that uses high-frequency sound waves to visualize the body's internal structures. It is a non-invasive and safe procedure that does not involve the use of ionizing radiation, making it widely used in various medical fields. Ultrasonography is used to study heart function, blood flow in the neck or extremities, certain conditions such as gallbladder disease, and fetal growth and development.
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Ion beam tracking using ultrasound motion detection.

M Prall1, R Kaderka1, N Saito1

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Diagnostic ultrasound (US) shows promise for real-time tumor motion detection in particle therapy. An artificial neural network improved accuracy, achieving 1 mm geometrical conformity for moving targets during scanned heavy ion beam irradiation.

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Area of Science:

  • Medical Physics
  • Radiotherapy
  • Medical Imaging

Background:

  • Particle therapy requires precise tumor localization for effective motion mitigation.
  • Real-time tumor position data is crucial for tracking and gating techniques.

Purpose of the Study:

  • To evaluate diagnostic ultrasound (US) as a real-time motion detection method.
  • To assess US for scanned heavy ion beam irradiation of moving targets in a phantom study.

Main Methods:

  • A tumor surrogate (rubber ball) moved in 2D trajectories within a water bath.
  • Ultrasound tracking system measured surrogate position, feeding data to a therapy control system (TCS).
  • An artificial neural network (ANN) was implemented in the TCS to predict motion and compensate for system delays.

Main Results:

  • Irradiation patterns achieved low inhomogeneity (few percent) and high geometrical conformity (approx. 1 mm).
  • ANN delay compensation effectively improved accuracy for large motion amplitudes.

Conclusions:

  • Diagnostic US is a promising dose-free, high frame-rate, and model-independent motion detection method.
  • Further investigation is warranted for scanned heavy ion beam therapy of moving targets.