Plan reproducibility of intraoperatively custom-built linked seeds compared to loose seeds for prostate brachytherapy

Tomoya Kaneda, Toshio Ohashi, Masanori Sakayori, Shinya Sutani, Shoji Yamashita, Tetsuo Momma, Shinichi Takahashi, Takashi Hanada, Naoyuki Shigematsu

Research output: Contribution to journalArticle

Abstract

Purpose: Few studies have compared the implant quality of linked and loose seeds for prostate brachytherapy. This study aimed to evaluate and compare plan reproducibility of intraoperatively built custom linked seeds and loose seeds for prostate brachytherapy. Material and methods: Between December 2010 and March 2014, 76 localized prostate cancer patients received Iodine-125 brachytherapy with external beam radiotherapy. Linked and loose seeds were implanted in 39 and 37 patients, respectively. The primary endpoint was the mean (± standard deviation) of the absolute change in the minimum dose received by 90% of the prostate volume between intraoperative and post-operative planning (ΔD90) to confirm plan reproducibility. Comparisons between the groups were evaluated using 2-sample t tests. Results: The ΔD90 values were 6.95 ± 11.6% and -0.41 ± 8.5% for the loose and linked seed groups, respectively (p < 0.01). The linked seed group showed decreased post-operative D90 (118.8% vs. 127.2%), V150 (51.7% vs. 66.7%), and RV100 (0.44 ml vs. 0.61 ml) compared to the loose seed group (p < 0.01), whereas lung migration tended to be reduced (0% vs. 8%). Conclusions: The plan reproducibility of the linked seed group was better than that of the loose seed group. Moreover, the linked seed group showed less migration and lower rectal dose.

Original languageEnglish
Pages (from-to)291-296
Number of pages6
JournalJournal of Contemporary Brachytherapy
Volume10
Issue number4
DOIs
Publication statusPublished - 2018 Jan 1

Fingerprint

Brachytherapy
Prostate
Seeds
Iodine
Prostatic Neoplasms
Radiotherapy
Lung

Keywords

  • Brachytherapy
  • Dosimetry
  • Linked seed
  • Migration
  • Prostate cancer

ASJC Scopus subject areas

  • Oncology
  • Radiology Nuclear Medicine and imaging

Cite this

Plan reproducibility of intraoperatively custom-built linked seeds compared to loose seeds for prostate brachytherapy. / Kaneda, Tomoya; Ohashi, Toshio; Sakayori, Masanori; Sutani, Shinya; Yamashita, Shoji; Momma, Tetsuo; Takahashi, Shinichi; Hanada, Takashi; Shigematsu, Naoyuki.

In: Journal of Contemporary Brachytherapy, Vol. 10, No. 4, 01.01.2018, p. 291-296.

Research output: Contribution to journalArticle

Kaneda, Tomoya ; Ohashi, Toshio ; Sakayori, Masanori ; Sutani, Shinya ; Yamashita, Shoji ; Momma, Tetsuo ; Takahashi, Shinichi ; Hanada, Takashi ; Shigematsu, Naoyuki. / Plan reproducibility of intraoperatively custom-built linked seeds compared to loose seeds for prostate brachytherapy. In: Journal of Contemporary Brachytherapy. 2018 ; Vol. 10, No. 4. pp. 291-296.
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abstract = "Purpose: Few studies have compared the implant quality of linked and loose seeds for prostate brachytherapy. This study aimed to evaluate and compare plan reproducibility of intraoperatively built custom linked seeds and loose seeds for prostate brachytherapy. Material and methods: Between December 2010 and March 2014, 76 localized prostate cancer patients received Iodine-125 brachytherapy with external beam radiotherapy. Linked and loose seeds were implanted in 39 and 37 patients, respectively. The primary endpoint was the mean (± standard deviation) of the absolute change in the minimum dose received by 90{\%} of the prostate volume between intraoperative and post-operative planning (ΔD90) to confirm plan reproducibility. Comparisons between the groups were evaluated using 2-sample t tests. Results: The ΔD90 values were 6.95 ± 11.6{\%} and -0.41 ± 8.5{\%} for the loose and linked seed groups, respectively (p < 0.01). The linked seed group showed decreased post-operative D90 (118.8{\%} vs. 127.2{\%}), V150 (51.7{\%} vs. 66.7{\%}), and RV100 (0.44 ml vs. 0.61 ml) compared to the loose seed group (p < 0.01), whereas lung migration tended to be reduced (0{\%} vs. 8{\%}). Conclusions: The plan reproducibility of the linked seed group was better than that of the loose seed group. Moreover, the linked seed group showed less migration and lower rectal dose.",
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AU - Yamashita, Shoji

AU - Momma, Tetsuo

AU - Takahashi, Shinichi

AU - Hanada, Takashi

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AB - Purpose: Few studies have compared the implant quality of linked and loose seeds for prostate brachytherapy. This study aimed to evaluate and compare plan reproducibility of intraoperatively built custom linked seeds and loose seeds for prostate brachytherapy. Material and methods: Between December 2010 and March 2014, 76 localized prostate cancer patients received Iodine-125 brachytherapy with external beam radiotherapy. Linked and loose seeds were implanted in 39 and 37 patients, respectively. The primary endpoint was the mean (± standard deviation) of the absolute change in the minimum dose received by 90% of the prostate volume between intraoperative and post-operative planning (ΔD90) to confirm plan reproducibility. Comparisons between the groups were evaluated using 2-sample t tests. Results: The ΔD90 values were 6.95 ± 11.6% and -0.41 ± 8.5% for the loose and linked seed groups, respectively (p < 0.01). The linked seed group showed decreased post-operative D90 (118.8% vs. 127.2%), V150 (51.7% vs. 66.7%), and RV100 (0.44 ml vs. 0.61 ml) compared to the loose seed group (p < 0.01), whereas lung migration tended to be reduced (0% vs. 8%). Conclusions: The plan reproducibility of the linked seed group was better than that of the loose seed group. Moreover, the linked seed group showed less migration and lower rectal dose.

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