Evaluation of radiation detectors for the determination of field output factors in Leksell Gamma Knife dosimetry using 3D printed phantom inserts.

Item request has been placed! ×
Item request cannot be made. ×
loading   Processing Request
Read More Add to Saved list
  • Additional Information
    • Source:
      Publisher: Istituti Editoriali e Poligrafici Internazionali Country of Publication: Italy NLM ID: 9302888 Publication Model: Print-Electronic Cited Medium: Internet ISSN: 1724-191X (Electronic) Linking ISSN: 11201797 NLM ISO Abbreviation: Phys Med Subsets: MEDLINE
    • Publication Information:
      Publication: Pisa : Istituti Editoriali e Poligrafici Internazionali
      Original Publication: Lugano, Switzerland : Giardini editori S.A.,
    • Subject Terms:
      Printing, Three-Dimensional* ; Phantoms, Imaging* ; Radiosurgery*/instrumentation ; Radiometry*/instrumentation; Monte Carlo Method
    • Abstract:
      The Leksell Gamma Knife® Perfexion™ and Icon™ have a unique geometry, containing 192 60 Co sources with collimation for field sizes of 4 mm, 8 mm, and 16 mm. 4 mm and 8 mm collimated fields lack lateral charged particle equilibrium, so accurate field output factors are essential. This study performs field output factor measurements for the microDiamond, microSilicon, and RAZOR™ Nano detectors. 3D printed inserts for the spherical Solid Water® Phantom were fabricated for microDiamond detector, the microSilicon unshielded diode and the RAZOR™ Nano micro-ionisation chamber. Detectors were moved iteratively to identify the peak detector signal for each collimator, representing the effective point of measurement of the chamber. In addition, field output correction factors were calculated for each detector relative to vendor supplied Monte Carlo simulated field output factors and field output factors measured with a W2 scintillator. All field output factors where within 1.1 % for the 4 mm collimator and within 2.3 % for the 8 mm collimator. The 3D printed phantom inserts were suitable for routine measurements if the user identifies the effective point of measurement, and ensures a reproducible setup by marking the rotational alignment of the cylindrical print. Measurements with the microDiamond and microSilicon can be performed faster compared to the RAZOR™ Nano due to differences in the signal to noise ratio. All detectors are suitable for field output factor measurements for the Leksell Gamma Knife® Perfexion™ and Icon™.
      Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
      (Crown Copyright © 2024. Published by Elsevier Ltd. All rights reserved.)
    • Contributed Indexing:
      Keywords: Dosimetry; Field output correction factors; Field output factors; Gamma Knife; RAZOR Nano; Small fields; microDiamond; microSilicon
    • Publication Date:
      Date Created: 20240427 Date Completed: 20240510 Latest Revision: 20240510
    • Publication Date:
      20240511
    • Accession Number:
      10.1016/j.ejmp.2024.103370
    • Accession Number:
      38677196