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A new extended-length parallel-plate ionization chamber.

Ana F Maia1, Linda V E Caldas

  • 1Instituto de Pesquisas Energéticas e Nucleares, Comissão Nacional de Energia Nuclear, Av. Prof. Lineu Prestes, 2242, CEP 05508-000, São Paulo, Brazil. afmaia@ipen.br

Physics in Medicine and Biology
|August 4, 2005
PubMed
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A novel parallel-plate ionization chamber was developed for computed tomography (CT) calibration. This cost-effective device demonstrated excellent performance in various radiation beams, serving as a valuable reference system.

Area of Science:

  • Medical Physics
  • Radiation Dosimetry
  • Instrumentation

Background:

  • Accurate radiation dosimetry is crucial for medical imaging quality assurance.
  • Existing ionization chambers may not optimally serve as reference systems for specific applications like computed tomography (CT).

Purpose of the Study:

  • To develop and characterize a novel parallel-plate ionization chamber.
  • To establish a cost-effective reference system for computed tomography (CT) standard beams at the IPEN Calibration Laboratory.
  • To evaluate the chamber's performance in mammography and diagnostic radiology beams.

Main Methods:

  • A custom parallel-plate ionization chamber was designed and manufactured.
  • The chamber's sensitive volume and dimensions were optimized to be comparable to commercial pencil ionization chambers.

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  • Performance was assessed through characterization and quality control tests in standard radiation beams (CT, mammography, diagnostic radiology).

    • Main Results:

    • The newly developed parallel-plate ionization chamber exhibited very good performance.
    • The chamber successfully functioned as a reference system in CT standard beams.
    • The device proved versatile, performing well in mammography and diagnostic radiology beams as well.

    Conclusions:

    • The developed parallel-plate ionization chamber is a suitable and cost-effective reference system for CT dosimetry.
    • Its performance across different radiation modalities highlights its potential utility in various radiological applications.
    • The simple and economical construction facilitates its adoption in calibration laboratories.