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Evaluation of Size Correction Factor for Size-specific Dose Estimates (SSDE) Calculation.

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Nihon Hoshasen Gijutsu Gakkai Zasshi
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The American Association of Physicists in Medicine (AAPM) size-specific dose estimate (SSDE) is useful for area detector CT (ADCT) dose assessment. This study found that AAPM

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Area of Science:

  • Medical Physics
  • Radiological Imaging
  • Radiation Dosimetry

Background:

  • The American Association of Physicists in Medicine (AAPM) Report No. 204 recommends size-specific dose estimates (SSDE) for computed tomography (CT) dose assessment, using the formula SSDE = CTDIvol × SCF.
  • SSDE accounts for patient thickness, but its applicability to area detector CT (ADCT) devices, like 320-row scanners, has not been extensively studied.
  • Previous research has not fully evaluated the size correction factor (SCF) for ADCT, necessitating an investigation into its accuracy and reliability.

Purpose of the Study:

  • To evaluate the size correction factor (SCF) values for area detector CT (ADCT) using simulation techniques.
  • To investigate the impact of varying beam widths on SCF values in ADCT.
  • To compare SCF values derived from ADCT simulations with those recommended by the AAPM.

Main Methods:

  • Simulations were performed using the Electron Gamma Shower Ver.5 (EGS5) code, incorporating measured dose ratios and effective energies specific to the Aquilion ONE X-ray CT system.
  • The geometry of the CT system was constructed, and simulations were run with polymethyl methacrylate (PMMA) phantoms ranging from 8 cm to 40 cm in thickness.
  • Computed tomography dose index-volume (CTDIvol) and size correction factor (SCF) were determined for different beam widths, including conventional and volume scans.

Main Results:

  • The study calculated SCF values for various beam widths in conventional and volume scans on ADCT.
  • Differences in SCF values between conventional scans, volume scans, and AAPM recommendations reached up to 23.0%.
  • Normalizing SCF values to a 16 cm diameter phantom reduced the error, particularly for thinner patients, suggesting improved accuracy for pediatric populations.

Conclusions:

  • The size correction factor (SCF) values recommended by the AAPM are considered useful in clinical practice, even with different beam widths and CT devices.
  • Despite variations observed in SCF values due to beam width and device type, the AAPM's recommendations provide a practical approach to dose assessment.
  • The findings support the continued use of AAPM-recommended SCF values for size-specific dose estimates in ADCT, with potential for improved accuracy in pediatric imaging.