eISSN: 2081-2841
ISSN: 1689-832X
Journal of Contemporary Brachytherapy
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2/2022
vol. 14
 
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abstract:
Original paper

Investigating the displacement of radio-active sources during gold-198 grain brachytherapy for hospitalized oral cancer patients

Masaru Konishi
1
,
Yuki Takeuchi
2
,
Katsumaro Kubo
2
,
Nobuki Imano
2
,
Ikuno Nishibuchi
2
,
Yuji Murakami
2
,
Kiichi Shimabukuro
3
,
Pongsapak Wongratwanich
3
,
Naoya Kakimoto
3
,
Yasushi Nagata
2

1.
Department of Oral and Maxillofacial Radiology, Hiroshima University Hospital, Japan
2.
Department of Radiation Oncology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Japan
3.
Department of Oral and Maxillofacial Radiology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Japan
J Contemp Brachytherapy 2022; 14, 2: 115–122
Online publish date: 2022/03/23
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Purpose
This study aimed to investigate status of displacement of gold-198 (198Au) grains in patients with oral cancers as well as factors and countermeasures for the displacement of 198Au grains.

Material and methods
The present study included 34 patients with oral cancers, who were exclusively treated with 198Au grain brachytherapy between 2013 and 2019. Timing and duration of the 198Au grain displacement from the oral cavity and reduction in radiation dose were estimated. Location of the displaced grain was classified as either inside or outside of gross tumor volume. Number and location of the displacement of 198Au grains, primary lesion, and growth type were evaluated.

Results
Of the 34 patients included in this study, 198Au grains were displaced in 4 patients (11.8%) during hospitalization. A total of 5 grains (1.4%) were displaced out of an overall count of 367 grains implanted in these 34 patients. Of the four patients who experienced displacement of 198Au grains, three had tongue cancer, and one had lip cancer. All four patients whose grains were displaced had superficial lesions.

Conclusions
When performing brachytherapy with 198Au grains for superficial lesions on the tongue or lips, care should be taken to avoid grain displacement.

keywords:

brachytherapy, radio-isotopes, mouth neoplasm, radiation dosage

 
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