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Research ArticleExperimental Studies

Comparison of the Characteristics of Two Types of Parallel-plate Ionization Chamber Under Small-field Electron Irradiation

YUYA YANAGI, HAJIME MONZEN, KAZUKI KUBO, JUNKO SUGIYAMA, KAZUO NOMA, TAKAAKI ITO, YUSUKE SAKAI, KENJI NAKAMURA, TETSUO KIDA, HIROSHI DOI and YASUMASA NISHIMURA
Anticancer Research May 2023, 43 (5) 1967-1972; DOI: https://doi.org/10.21873/anticanres.16356
YUYA YANAGI
1Department of Medical Physics, Graduate School of Medical Sciences, Kindai University, Osakasayama, Japan;
2Department of Radiology, Shiga University of Medical Science Hospital, Otsu, Japan;
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  • For correspondence: yanagi@belle.shiga-med.ac.jp
HAJIME MONZEN
1Department of Medical Physics, Graduate School of Medical Sciences, Kindai University, Osakasayama, Japan;
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KAZUKI KUBO
1Department of Medical Physics, Graduate School of Medical Sciences, Kindai University, Osakasayama, Japan;
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JUNKO SUGIYAMA
2Department of Radiology, Shiga University of Medical Science Hospital, Otsu, Japan;
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KAZUO NOMA
2Department of Radiology, Shiga University of Medical Science Hospital, Otsu, Japan;
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TAKAAKI ITO
1Department of Medical Physics, Graduate School of Medical Sciences, Kindai University, Osakasayama, Japan;
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YUSUKE SAKAI
1Department of Medical Physics, Graduate School of Medical Sciences, Kindai University, Osakasayama, Japan;
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KENJI NAKAMURA
1Department of Medical Physics, Graduate School of Medical Sciences, Kindai University, Osakasayama, Japan;
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TETSUO KIDA
2Department of Radiology, Shiga University of Medical Science Hospital, Otsu, Japan;
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HIROSHI DOI
3Department of Radiation Oncology, Faculty of Medicine, Kindai University, Osakasayama, Japan
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YASUMASA NISHIMURA
3Department of Radiation Oncology, Faculty of Medicine, Kindai University, Osakasayama, Japan
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Abstract

Background/Aim: This study compared two types of parallel-plate ionization chamber to clarify the pitfalls of dosimetry in electron radiation therapy. Materials and Methods: The ion recombination correction factor and polarity effect correction factor, sensitivity, and percentage depth doses (PDDs) of PPC05 and PPC40 parallel-plate ionization chambers were compared in a small-field electron beam. The output ratios were measured for 4-20 MeV electron beams with field sizes of 10 cm × 10 cm, 6 cm × 6 cm, and 4 cm × 4 cm. Furthermore, the films were placed in water and positioned in the beam with their surface perpendicular to the beam axis, and lateral profiles were obtained for each beam energy and each field. Results: Regarding PDDs, at depths greater than the peak dose, the percentage depth dose for PPC40 was smaller than that for PPC05 in small fields and at beam energies greater than 12 MeV, which could be attributed to the lack of lateral electron equilibrium at small depths and multiple scattering events at large depths. The output ratio of PPC40 was approximately 0.025–0.038, which was lower than that of PPC05 in a 4 cm × 4 cm field. For large fields, the lateral profiles were similar, regardless of the beam energy, however, for small fields, the flatness of the lateral profile was beam energy dependent. Conclusion: The PPC05 chamber, which has a smaller ionization volume, is therefore more suitable than the PPC40 chamber for small-field electron dosimetry, in particular at high beam energies.

Key Words:
  • PPC40
  • PPC05
  • parallel-plate ionization chamber
  • electron beam
  • small field
  • percentage depth dose
  • Received February 17, 2023.
  • Revision received February 28, 2023.
  • Accepted March 1, 2023.
  • Copyright © 2023 International Institute of Anticancer Research (Dr. George J. Delinasios), All rights reserved.
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Anticancer Research: 43 (5)
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Comparison of the Characteristics of Two Types of Parallel-plate Ionization Chamber Under Small-field Electron Irradiation
YUYA YANAGI, HAJIME MONZEN, KAZUKI KUBO, JUNKO SUGIYAMA, KAZUO NOMA, TAKAAKI ITO, YUSUKE SAKAI, KENJI NAKAMURA, TETSUO KIDA, HIROSHI DOI, YASUMASA NISHIMURA
Anticancer Research May 2023, 43 (5) 1967-1972; DOI: 10.21873/anticanres.16356

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Comparison of the Characteristics of Two Types of Parallel-plate Ionization Chamber Under Small-field Electron Irradiation
YUYA YANAGI, HAJIME MONZEN, KAZUKI KUBO, JUNKO SUGIYAMA, KAZUO NOMA, TAKAAKI ITO, YUSUKE SAKAI, KENJI NAKAMURA, TETSUO KIDA, HIROSHI DOI, YASUMASA NISHIMURA
Anticancer Research May 2023, 43 (5) 1967-1972; DOI: 10.21873/anticanres.16356
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Keywords

  • PPC40
  • PPC05
  • parallel-plate ionization chamber
  • electron beam
  • small field
  • percentage depth dose
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