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Coupling surface cameras with on-board fluoroscopy: a feasibility study.

Carri K Glide-Hurst1, Dan Ionascu, Ross Berbeco

  • 1Department of Radiation Oncology, Henry Ford Health Systems, Detroit, Michigan 48202, USA. churst2@hfhs.org

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This summary is machine-generated.

Three-dimensional surface imaging cameras can accurately track external surrogates for internal tumor motion, synchronizing with kV imaging. This technology shows promise for facilitating gated radiation therapy treatments in lung cancer patients.

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Area of Science:

  • Medical Physics
  • Radiation Oncology
  • Image Guidance

Background:

  • Accurate tumor motion tracking is crucial for effective radiation therapy.
  • External surrogates offer a non-invasive method for monitoring internal organ movement during treatment.

Purpose of the Study:

  • To assess the feasibility of using 3D surface imaging cameras as external surrogates for tumor motion.
  • To achieve temporal synchronization between surface imaging and kV imaging for real-time tracking.

Main Methods:

  • A hardware controller interfaced kV fluoroscopy with surface imaging computers.
  • Phantom studies used a programmable motion platform and simulated patient data.
  • Clinical validation involved imaging lung cancer patients with simultaneous kV fluoroscopy and surface imaging.

Main Results:

  • Surface imaging accurately measured chest wall motion amplitude (1.005 +/- 0.003 cm) and period.
  • System latency was characterized as 0.64 +/- 0.02 s for sinusoidal motion and 0.65 +/- 0.03 s for simulated patient motion.
  • Abdomen-to-tumor motion correlation (Pearson r = 0.93-0.98) was comparable or superior to diaphragm-to-tumor correlation (Pearson r = 0.89-0.95).

Conclusions:

  • 3D surface imaging cameras are feasible external surrogates for tracking tumor motion in synchrony with kV imaging.
  • This approach can facilitate gated radiation therapy using surface imaging.
  • Further patient studies are recommended to confirm these findings and optimize the technique.