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Simulation study on the conversion between CT and CBCT dose quantities via the effective dose.

Steffen Ketelhut1, Marie-Luise Kuhlmann1, Ludwig Büermann1

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Summary
This summary is machine-generated.

Cone-beam computed tomography (CBCT) and computed tomography (CT) dose metrics are not directly convertible, hindering comparisons. This study provides conversion coefficients to establish common diagnostic reference levels for both imaging modalities.

Keywords:
Monte-Carlo simulationscomputed tomographycone-beam computed tomographydose-area productdose-length productdosimetry

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Area of Science:

  • Medical Physics
  • Radiological Imaging
  • Radiation Dosimetry

Background:

  • Cone-beam computed tomography (CBCT) is increasingly used for tasks traditionally performed by computed tomography (CT).
  • Dosimetric quantities like dose-area product (DAP) and dose-length product (DLP) are not mutually convertible between CBCT and CT.
  • This lack of convertibility complicates dose comparisons in clinical studies and the application of diagnostic reference levels (DRLs).

Purpose of the Study:

  • To investigate the conversion of DAP to DLP and vice versa via effective dose (E).
  • To establish common diagnostic reference levels (DRLs) for both CT and CBCT imaging tasks.

Main Methods:

  • Monte Carlo simulations were used for dose calculations.
  • Simulations covered four head and four trunk scan regions applicable to both CT and CBCT.
  • Conversion coefficients (k=DAP/DLP) were calculated for each region.

Main Results:

  • Calculated conversion coefficients (k) varied by anatomical region.
  • Examples include: cranium 30(4) cm, thorax 78(12) cm, and pelvis 70(12) cm.
  • These coefficients provide a basis for inter-modality dose comparison.

Conclusions:

  • The study provides essential conversion coefficients for DAP and DLP between CT and CBCT.
  • These findings facilitate the establishment of unified diagnostic reference levels (DRLs).
  • Enables more accurate dose assessment and comparison across different imaging techniques.