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Technical note: MR image-based synthesis CT for CyberKnife robotic stereotactic radiosurgery.

Shengxiu Jiao1, Xiaoqian Zhao1, Peng Zhou2

  • 1Department of Nuclear Medicine, Shandong Provincial Hospital Affiliated to Shandong First Medical University, Jinan, Shandong, People's Republic of China.

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Summary

Deep learning accurately generates synthetic CT (sCT) images from MR scans for CyberKnife robotic radiosurgery. This enables precise radiation dose calculation, expanding MRI-only radiotherapy applications.

Keywords:
CyberKnife robotic stereotactic radiosurgeryMR-only radiation therapydeep learningsynthesis CT

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Area of Science:

  • Medical Physics
  • Radiotherapy Technology
  • Artificial Intelligence in Medicine

Background:

  • Accurate dose calculation is crucial for effective stereotactic radiosurgery.
  • Synthetic CT (sCT) generation from MRI offers potential for MRI-only radiotherapy, reducing patient radiation exposure.
  • CyberKnife (CK) robotic stereotactic radiosurgery requires precise imaging for treatment planning.

Purpose of the Study:

  • To evaluate the accuracy of deep learning-based synthetic CT (sCT) images for dose calculation in CyberKnife (CK) robotic stereotactic radiosurgery.
  • To determine if MR-only workflows are feasible for CK treatments.

Main Methods:

  • A U-net convolutional neural network was trained on 2446 MR-CT image pairs.
  • 551 MR images were translated to sCT images for testing.
  • Dose calculations on sCT images were validated against conventional CT images using a QA phantom and statistical tests (Wilcoxon signed rank test).
  • Mean Absolute Error (MAE) and percentage dose differences in critical regions were analyzed.

Main Results:

  • The MAE for the whole brain region between CT and sCT was below 25 HU.
  • Percentage dose differences were minimal: < ±0.4% for GTV, PTV, and brainstem.
  • Most regions of interest (ROIs) showed dose differences of no more than ±0.04%.

Conclusions:

  • Deep learning-based sCT generation provides accurate dose calculations for CyberKnife robotic stereotactic radiosurgery.
  • This technology expands the application of MR-only radiation therapy in CK treatments.
  • The findings support the clinical feasibility of using sCT for dose verification in CK radiosurgery.