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<p>This study evaluates the microDiamond detector (PTW 60019) for small-field dosimetry and introduces a cubic correction model (R<sup>2</sup> = 0.86) to account for its over-response in very small fields. Measurements on a Clinac IX (6 MV) were benchmarked against an A28 chamber and Gafchromic EBT3 film. Output factor corrections derived from the cubic model showed high agreement with values obtained using the Daisy Chain method recommended in IAEA TRS-483. Post-correction, microDiamond and EBT3 values agreed within 2.5%. These findings support the microDiamond’s suitability for stereotactic small-field dosimetry when model-based corrections are applied.</p>

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Novel correction model for microDiamond detector response in small-field radiotherapy: demonstrated improvements over the Daisy Chain method

  • 期刊论文

  • 发表日期：

    2026年1月23日

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  • H. Sekkat,
  • A. Khallouqi,
  • O. El Mouden,
  • A. Bannan,
  • Y. Berrada,
  • A. Halimi,
  • O. El Rhazouani

摘要

This study evaluates the microDiamond detector (PTW 60019) for small-field dosimetry and introduces a cubic correction model (R2 = 0.86) to account for its over-response in very small fields. Measurements on a Clinac IX (6 MV) were benchmarked against an A28 chamber and Gafchromic EBT3 film. Output factor corrections derived from the cubic model showed high agreement with values obtained using the Daisy Chain method recommended in IAEA TRS-483. Post-correction, microDiamond and EBT3 values agreed within 2.5%. These findings support the microDiamond’s suitability for stereotactic small-field dosimetry when model-based corrections are applied.