Quality assurance of I-125 seeds for prostate brachytherapy using an imaging plate

Shunsuke Furutani, Takuya Saze, Hitoshi Ikushima, Masataka Oita, Kyousuke Ozaki, Yoshiomi Kishida, Yoshihiro Takegawa, Hiromu Nishitani

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)


Purpose: OncoSeed is delivered in a sterile environment in the form of a cartridge, so it is impractical to resterilize and reload seeds after calibration. We investigated a new method using an imaging plate dosimetry system to characterize all seeds in the OncoSeed cartridge in a sterile environment. Methods and Materials: Seeds within the cartridge were placed on an imaging plate, and the imaging plate irradiated. To remove scatter radiation, and improve spatial resolution of seed images, we used X-ray parallel cross grids. The irradiated imaging plate was scanned using a Bio-imaging Analyzer System, and radioactivity intensities of seed images were given in counts. Counts could be translated to profiles, and each seed within the cartridge was analyzed. Results: Results showed a good correlation between counts and total radioactivity of the seeds within the cartridge. Thus, using a least-squares line, it was possible to characterize a cartridge with unknown apparent activity. By analyzing the profiles, it was possible not only to detect a miscalibrated seed in the cartridge from its relative difference in counts, but also to identify its position in the cartridge. No significant changes in counts were seen between sterile and nonsterile environments. Conclusion: Using an imaging plate dosimetry system, all seeds in a cartridge could be characterized in a sterile environment.

Original languageEnglish
Pages (from-to)603-609
Number of pages7
JournalInternational Journal of Radiation Oncology Biology Physics
Issue number2
Publication statusPublished - Oct 1 2006
Externally publishedYes


  • Cartridge
  • I-125 seed
  • Imaging plate
  • Prostate brachytherapy
  • Quality assurance

ASJC Scopus subject areas

  • Radiation
  • Oncology
  • Radiology Nuclear Medicine and imaging
  • Cancer Research


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