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A measurement-based X-ray source model characterization for CT dosimetry computations.

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Summary
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This study demonstrates that peak tube voltage (kVp) and half-value layer (HVL) accurately characterize computed tomography (CT) X-ray sources. The validated kVDoseCalc algorithm precisely computes CT patient doses, improving accuracy and safety.

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Area of Science:

  • Medical Physics
  • Radiological Physics
  • Diagnostic Imaging

Background:

  • Accurate characterization of computed tomography (CT) X-ray sources is crucial for precise dose calculation.
  • Existing methods for CT X-ray source modeling may require further validation for patient-specific dose computation.

Purpose of the Study:

  • To establish that nominal peak tube voltage potential (kVp) and measured half-value layer (HVL) can characterize CT X-ray sources.
  • To validate an in-house dose computation algorithm (kVDoseCalc) for machine- and patient-specific CT dose calculations.

Main Methods:

  • Measured HVL along internal bow-tie filter axes to assess spatial variation of X-ray source spectra.
  • Utilized third-party software (Spektr) and nominal kVp to generate energy spectra.
  • Calculated beam fluence and validated kVDoseCalc using PMMA and anthropomorphic thorax phantoms with ionization chambers.

Main Results:

  • The source model and characterization technique using HVL and kVp accurately represented CT X-ray sources.
  • kVDoseCalc demonstrated high accuracy, with average percent differences between calculation and measurement below 1.5% for PMMA phantom.
  • Maximum percent differences were under 3.50%, with most simulations within experimental uncertainties.

Conclusions:

  • The developed method based on HVL measurements and nominal kVp is effective for accurate CT X-ray source characterization.
  • Experimental validation confirms kVDoseCalc's capability for precise computation of CT dose, essential for patient safety.