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2D monolithic silicon-diode array detectors in megavoltage photon beams: does the fabrication technology matter? A medical physicist’s perspective

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Abstract

A family of prototype 2D monolithic silicon-diode array detectors (MP512, Duo, Octa) has been proposed by the Centre for Medical Radiation Physics, University of Wollongong (Australia) for relative dosimetry in small megavoltage photon beams. These detectors, which differ in the topology of their 512 sensitive volumes, were originally fabricated on bulk p-type substrates. More recently, they have also been fabricated on epitaxial p-type substrates. In the literature, their performance has been individually characterized for quality assurance (QA) applications. The present study directly assessed and compared that of a MP512-bulk and that of a MP512-epitaxial in terms of radiation hardness, long-term stability, response linearity with dose, dose per pulse and angular dependence. Their measurements of output factors, off-axis ratios and percentage depth doses in square radiation fields collimated by the jaws and produced by 6 MV and 10 MV flattened photon beams were then benchmarked against those by commercially available detectors. The present investigation was aimed at establishing, from a medical physicist’s perspective, how the bulk and epitaxial fabrication technologies would affect the implementation of the MP512s into a QA protocol. Based on results, the MP512-epitaxial would offer superior radiation hardness, long-term stability and achievable uniformity and reproducibility of the response across the 2D active area.

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Acknowledgements

Nauljun Stansook was supported by a faculty of Medicine Ramathibodi Hospital (Mahidol University, Bangkok, Thailand). We would like to acknowledge the Gross Foundation (Melbourne, Australia) for financial support. The authors are also grateful to Dr. Justin Davies at the GATRI facility (ANSTO, Lucas Heights, Australia).

Funding

This study was funded by the National Health and Medical Research Council of Australia with the Project Grant No. APP1030159.

Author information

Authors and Affiliations

  1. Centre for Medical Radiation Physics (CMRP), University of Wollongong, Wollongong, Australia

    N. Stansook, G. Biasi, K. Utitsarn, M. Petasecca, P. Metcalfe, M. L. F. Lerch, T. Kron & A. B. Rosenfeld

  2. Department of Radiology, Faculty of Medicine, Mahidol University, Bangkok, Thailand

    N. Stansook

  3. Illawarra Health and Medical Research Institute (IHMRI), Wollongong, Australia

    M. Petasecca, M. Carolan, M. L. F. Lerch & A. B. Rosenfeld

  4. Illawarra Cancer Care Centre (ICCC), Wollongong, Australia

    M. Carolan

  5. Department of Medical Services, Lopburi Cancer Hospital, Lopburi, Thailand

    K. Utitsarn

  6. SPA-BIT, Kiev, Ukraine

    V. L. Perevertaylo

  7. Peter MacCallum Cancer Centre, Melbourne, Australia

    T. Kron

  8. Sir Peter MacCallum Cancer Institute, University of Melbourne, Melbourne, Australia

    T. Kron

Authors
  1. N. Stansook
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  2. G. Biasi
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  3. K. Utitsarn
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  4. M. Petasecca
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  5. P. Metcalfe
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  6. M. Carolan
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  7. M. L. F. Lerch
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  8. V. L. Perevertaylo
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  9. T. Kron
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  10. A. B. Rosenfeld
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Correspondence to A. B. Rosenfeld.

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Stansook, N., Biasi, G., Utitsarn, K. et al. 2D monolithic silicon-diode array detectors in megavoltage photon beams: does the fabrication technology matter? A medical physicist’s perspective. Australas Phys Eng Sci Med 42, 443–451 (2019). https://doi.org/10.1007/s13246-019-00736-7

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  • DOI: https://doi.org/10.1007/s13246-019-00736-7

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