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Updated: Aug 11, 2026
Irradiator Commissioning and Dosimetry for Assessment of LQ α and β Parameters, Radiation Dosing Schema, and in vivo Dose Deposition
Published on: March 11, 2021
Quality assurance of I-125 seed permanent implant therapy using a self-color developing reflection-type dosimetry
Shunsuke Furutani1, Hitoshi Ikushima, Kyosuke Ozaki
1Department of Radiology, The University of Tokushima, Japan.
Purpose:
We evaluated a self-color developing sheet-type film for the detection of dead seeds in I-125 permanent implant therapy for prostate cancer.
Materials And Methods:
As a preliminary study, we irradiated X-rays to a self-developing reflection-type sheet film and created a relational curve between absorbed dose and film density. I-125 seeds were placed on a film and the approximate absorbed dose of I-125 was calculated from the relational curve of X-rays. A cartridge in which a dead seed was loaded among 10 I-125 seeds was placed on the film and the detectability of the dead seed was evaluated.
Results:
Using the relational curve of X-rays, it was possible to measure the approximate absorbed dose of I-125 seeds and to easily detect a dead seed at a glance. Using sterilized film, it was possible to detect a dead seed.
Conclusion:
The self-developing film method is feasible for the detection of a dead seed in a cartridge without re-sterilization of seeds.
