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Feasibility study of utilizing Sphinx Compact for quality assurance in uniform scanning proton therapy

  • Suresh Rana
    Correspondence
    Corresponding author at: Department of Radiation Oncology, Lynn Cancer Institute, Boca Raton Regional Hospital, Baptist Health South Florida, Boca Raton, FL, USA.
    Affiliations
    Department of Medical Physics, The Oklahoma Proton Center, Oklahoma City, OK, USA

    Department of Radiation Oncology, Lynn Cancer Institute, Boca Raton Regional Hospital, Baptist Health South Florida, Boca Raton, FL, USA

    Department of Radiation Oncology, Florida International University, Miami, FL, USA
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  • Colton Eckert
    Affiliations
    Department of Medical Physics, The Oklahoma Proton Center, Oklahoma City, OK, USA
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  • Biniam Tesfamicael
    Affiliations
    Department of Medical Physics, The Oklahoma Proton Center, Oklahoma City, OK, USA
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Published:November 03, 2022DOI:https://doi.org/10.1016/j.ejmp.2022.10.001

      Highlights

      • Sphinx compact produced results comparable to other detectors.
      • Sphinx compact showed the potential of using it in uniform scanning protons.
      • Monthly QA time in uniform scanning protons can be reduced using Sphinx Compact.

      Abstract

      Purpose

      To investigate the feasibility of utilizing the Sphinx Compact detector for quality assurance in a uniform scanning proton therapy system.

      Method

      The Sphinx Compact detector was used to measure various dosimetric parameters of uniform scanning proton beam at the Oklahoma Proton Center: distal range, distal-fall-off, collinearity, field symmetry, flatness, and field size for four different beams. A specially designed brass aperture was used to perform the required measurements. The Sphinx Compact measurement results were validated against the measurement results from the well-established detectors in proton therapy: IBA Zebra, IBA MatriXX-PT, EBT3 films, and Logos XRV-124. The data collected using the Sphinx Compact was analyzed in myQA software.

      Results

      Based on the data analysis performed, the Sphinx Compact measurements were within acceptable accuracy to the results from the detectors mentioned in the Method section. Specifically, the lateral penumbra was within ±0.4 mm, collinearity was within ± 0.5 mm, flatness was within ±0.6 %, symmetry within ±1.6 %, distal range was within ±0.5 mm, distal-fall-off was <0.9 mm, and field size was within ±1 mm. The reproducibility of the Sphinx Compact was tested for range and collinearity, and the results were within ±0.1 mm.

      Conclusion

      The sphinx Compact detector could potentially replace multiple detectors utilized for monthly QA in uniform scanning proton therapy. In a multi-room center, performing the QA with one detector compared to using multiple detectors dramatically reduces total QA time and the complexity of the QA process.

      Keywords

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