Measurement of the strength of iodine-125 seed moving at unknown speed during implantation in brachytherapy

The aim of this study is to demonstrate the feasibility of estimating the strength of the moving radiation source during patient implantation. The requirement for the counting time was investigated by comparing the results of the measurements for the static source with those for the source moving at...

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Bibliographic Details
Published in:Journal of radiation research 2014-01, Vol.55 (1), p.162-167, Article 162
Main Authors: Tanaka, Kenichi, Endo, Satoru, Tateoka, Kunihiko, Asanuma, Osamu, Kamo, Ken-ichi, Sato, Kaori, Takeda, Hiromitsu, Takagi, Masaru, Hareyama, Masato, Takada, Jun
Format: Article
Language:English
Subjects:
Brachytherapy
Brachytherapy - instrumentation
Brachytherapy - methods
Counting
Detection equipment
Detectors
Estimating
Feasibility
Humans
Implantation
Iodine Radioisotopes - analysis
Iodine Radioisotopes - therapeutic use
Measurement
Motion
Needles
Prostheses and Implants
Prosthesis Implantation - methods
Radiation Protection - methods
Radiometry - methods
Radiotherapy Dosage
Reproducibility of Results
Sensitivity and Specificity
Strength
Technology
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Summary:The aim of this study is to demonstrate the feasibility of estimating the strength of the moving radiation source during patient implantation. The requirement for the counting time was investigated by comparing the results of the measurements for the static source with those for the source moving at 2, 5, 10 and 20 cm s−1. The utilized source was 125I with an air-kerma strength of 0.432 U ( Gym2h-1). The detector utilized was a plastic scintillation detector (8 cm × 5 cm × 2 cm in thickness) set at 8 cm away from the needle to guide the source. Experiments were conducted in order to determine the most desirable counting time. Analysis using the maximum of the measured values while the source passed through the needle indicated that the results for the moving source increased more than those for the static source as the counting time decreased. The combined standard uncertainty, with the coverage factor of 1, was within 4% at the counting time of 100 ms. This investigation supported the feasibility of the method proposed for estimating the source strength during the implantation procedure, regardless of the source speed. The method proposed is a potential option for reducing the risk of accidental replacements of sources with those of incorrect strengths.
ISSN:0449-3060
1349-9157
DOI:10.1093/jrr/rrt087