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How does CBCT reconstruction algorithm impact on deformably mapped targets and accumulated dose distributions?

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A novel iterative cone-beam CT (CBCT) reconstruction algorithm impacts deformable image registration and dose accumulation in prostate cancer radiotherapy. This iterative approach shows improved contour accuracy and dose distribution compared to standard FDK-CBCT methods.

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Area of Science:

  • Medical Physics
  • Radiotherapy
  • Image Reconstruction

Background:

  • Cone-beam CT (CBCT) is crucial for image-guided radiotherapy.
  • Standard Feldkamp-Davis-Kress (FDK) reconstruction may introduce artifacts affecting downstream analysis.
  • Iterative reconstruction algorithms offer potential improvements in image quality.

Purpose of the Study:

  • To quantitatively compare deformable image registration (DIR) and deformable dose accumulation (DDA) between standard FDK-CBCT and a novel iterative CBCT reconstruction algorithm.
  • To assess the impact of different CBCT reconstruction methods on dosimetric accuracy and contouring in prostate cancer radiotherapy.

Main Methods:

  • CBCT datasets were reconstructed using both FDK and iterative algorithms for 323 treatment fractions in 10 prostate cancer patients.
  • Planning CT images were registered to CBCT datasets, and daily doses were computed and mapped to the planning CT.
  • Comparisons included voxel dose differences, clinical constraint adherence, and contour accuracy using three DIR algorithms against ground truth.

Main Results:

  • Average daily dose differences were within 1 cGy, but maximum point dose differences after deformable mapping reached 1.33 Gy.
  • Maximum normalized DDA differences per fraction were up to 0.80 Gy.
  • The iterative CBCT algorithm improved contour accuracy, with increased Dice similarity (0.10) and decreased distance metrics (2.5 mm for mass center, 3.3 mm for Hausdorff).

Conclusions:

  • The iterative CBCT reconstruction algorithm yields different mapped volumes of interest, deformed doses, and cumulative doses compared to conventional FDK-CBCT.
  • These differences suggest that iterative reconstruction may enhance the accuracy of image-guided radiotherapy for prostate cancer patients.