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    Annual International Conference of the IEEE Engineering in Medicine and Biology Society. IEEE Engineering in Medicine and Biology Society. Annual International Conference
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    Measuring X-ray tube energy spectra is challenging due to photon pile-up. This study estimates spectra using a flat panel detector and Monte Carlo methods, achieving acceptable accuracy for tungsten anodes between 50-70 kVp.

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    Area of Science:

    • Medical Physics
    • Radiological Imaging
    • Computational Physics

    Background:

    • X-ray tube energy spectrum measurement is hindered by photon pile-up effects from high photon fluence.
    • Accurate spectral information is crucial for optimizing radiation dose and diagnostic image quality.

    Purpose of the Study:

    • To estimate the primary X-ray spectrum of radiodiagnostic X-ray tubes.
    • To analyze the challenges and applicability of using a flat panel detector and Monte Carlo methods for spectral unfolding.

    Main Methods:

    • Utilized a flat panel detector with a PMMA wedge to record dose curves under specific X-ray tube conditions.
    • Employed the Monte Carlo method to determine the response function (matrix) relating dose curves to the primary X-ray spectrum.
    • Unfolded the primary X-ray spectrum using the measured dose curve and the derived response matrix.

    Main Results:

    • The study analyzed technical limitations of flat panel detectors and inherent radiation physics challenges (ill-posed problem).
    • The proposed spectral unfolding method demonstrated acceptable accuracy for X-ray spectra lacking characteristic lines.
    • Specifically, the method is suitable for tungsten anode X-ray tubes operating in the 50-70 kVp range.

    Conclusions:

    • The combination of flat panel detectors, attenuating materials, and Monte Carlo simulations offers a viable approach for X-ray spectrum estimation.
    • The method's accuracy is dependent on the spectral characteristics, being more reliable for continuous spectra without prominent characteristic X-ray lines.
    • This technique provides a practical tool for characterizing X-ray beams in diagnostic radiology, particularly within specific voltage ranges.