Multi-institutional retrospective analysis of learning curves on dosimetry and operation time before and after introduction of intraoperatively built custom-linked seeds in prostate brachytherapy

Hiromichi Ishiyama, Takefumi Satoh, Atsunori Yorozu, Shiro Saito, Masaaki Kataoka, Katsuyoshi Hashine, Ryuji Nakamura, Susumu Tanji, Koji Masui, Koji Okihara, Toshio Ohashi, Tetsuo Momma, Manabu Aoki, Kenta Miki, Masako Kato, Masashi Morita, Norihisa Katayama, Yasutomo Nasu, Takashi Kawanaka, Tomoharu FukumoriFumitaka Ito, Ryoichi Shiroki, Yuji Baba, Akito Inadome, Yasuo Yoshioka, Hitoshi Takayama, Kazushige Hayakawa

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

This multi-institutional retrospective analysis examined learning curves for dosimetric parameters and operation time after introduction of intraoperatively built custom-linked (IBCL) seeds. Data from consecutive patients treated with seed implantation before and after introduction of IBCL seeds (loose seed, n = 428; IBCL seed, n = 426) were collected from 13 centers. Dose-volume histogram parameters, operation times, and seed migration rates were compared before and after introduction of IBCL seeds. At the 1-month CT analysis, no significant differences were seen in dose to 90% of prostate volume between before and after IBCL seed introduction. No learning curve for dosimetry was seen. Prostate and rectal volume receiving at least 150% of prescription dose (V150 and RV150) were higher in the loose-seed group than in the IBCL-seed group. Operation time was extended by up to 10 min when IBCL seeds were used, although there was a short learning curve of about five patients. The percentage of patients with seed migration in the IBCL-seed group was one-tenth that in the loose-seed group. Our study revealed no dosimetric demerits, no learning curve for dosimetry, and a slightly extended operation time for IBCL seeds. A significant reduction in the rate of seed migration was identified in the IBCL-seed group.

Original languageEnglish
Pages (from-to)68-74
Number of pages7
JournalJournal of Radiation Research
Volume57
Issue number1
DOIs
Publication statusPublished - Jan 1 2016

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learning curves
Learning Curve
Brachytherapy
dosimeters
seeds
Prostate
Seeds
dosage

Keywords

  • I
  • Brachytherapy
  • Intraoperatively built custom-linked seed
  • Loose seed
  • Low dose rate
  • Prostate cancer

ASJC Scopus subject areas

  • Radiology Nuclear Medicine and imaging
  • Radiation
  • Health, Toxicology and Mutagenesis

Cite this

Multi-institutional retrospective analysis of learning curves on dosimetry and operation time before and after introduction of intraoperatively built custom-linked seeds in prostate brachytherapy. / Ishiyama, Hiromichi; Satoh, Takefumi; Yorozu, Atsunori; Saito, Shiro; Kataoka, Masaaki; Hashine, Katsuyoshi; Nakamura, Ryuji; Tanji, Susumu; Masui, Koji; Okihara, Koji; Ohashi, Toshio; Momma, Tetsuo; Aoki, Manabu; Miki, Kenta; Kato, Masako; Morita, Masashi; Katayama, Norihisa; Nasu, Yasutomo; Kawanaka, Takashi; Fukumori, Tomoharu; Ito, Fumitaka; Shiroki, Ryoichi; Baba, Yuji; Inadome, Akito; Yoshioka, Yasuo; Takayama, Hitoshi; Hayakawa, Kazushige.

In: Journal of Radiation Research, Vol. 57, No. 1, 01.01.2016, p. 68-74.

Research output: Contribution to journalArticle

Ishiyama, H, Satoh, T, Yorozu, A, Saito, S, Kataoka, M, Hashine, K, Nakamura, R, Tanji, S, Masui, K, Okihara, K, Ohashi, T, Momma, T, Aoki, M, Miki, K, Kato, M, Morita, M, Katayama, N, Nasu, Y, Kawanaka, T, Fukumori, T, Ito, F, Shiroki, R, Baba, Y, Inadome, A, Yoshioka, Y, Takayama, H & Hayakawa, K 2016, 'Multi-institutional retrospective analysis of learning curves on dosimetry and operation time before and after introduction of intraoperatively built custom-linked seeds in prostate brachytherapy', Journal of Radiation Research, vol. 57, no. 1, pp. 68-74. https://doi.org/10.1093/jrr/rrv065
Ishiyama, Hiromichi ; Satoh, Takefumi ; Yorozu, Atsunori ; Saito, Shiro ; Kataoka, Masaaki ; Hashine, Katsuyoshi ; Nakamura, Ryuji ; Tanji, Susumu ; Masui, Koji ; Okihara, Koji ; Ohashi, Toshio ; Momma, Tetsuo ; Aoki, Manabu ; Miki, Kenta ; Kato, Masako ; Morita, Masashi ; Katayama, Norihisa ; Nasu, Yasutomo ; Kawanaka, Takashi ; Fukumori, Tomoharu ; Ito, Fumitaka ; Shiroki, Ryoichi ; Baba, Yuji ; Inadome, Akito ; Yoshioka, Yasuo ; Takayama, Hitoshi ; Hayakawa, Kazushige. / Multi-institutional retrospective analysis of learning curves on dosimetry and operation time before and after introduction of intraoperatively built custom-linked seeds in prostate brachytherapy. In: Journal of Radiation Research. 2016 ; Vol. 57, No. 1. pp. 68-74.
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AU - Ishiyama, Hiromichi

AU - Satoh, Takefumi

AU - Yorozu, Atsunori

AU - Saito, Shiro

AU - Kataoka, Masaaki

AU - Hashine, Katsuyoshi

AU - Nakamura, Ryuji

AU - Tanji, Susumu

AU - Masui, Koji

AU - Okihara, Koji

AU - Ohashi, Toshio

AU - Momma, Tetsuo

AU - Aoki, Manabu

AU - Miki, Kenta

AU - Kato, Masako

AU - Morita, Masashi

AU - Katayama, Norihisa

AU - Nasu, Yasutomo

AU - Kawanaka, Takashi

AU - Fukumori, Tomoharu

AU - Ito, Fumitaka

AU - Shiroki, Ryoichi

AU - Baba, Yuji

AU - Inadome, Akito

AU - Yoshioka, Yasuo

AU - Takayama, Hitoshi

AU - Hayakawa, Kazushige

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N2 - This multi-institutional retrospective analysis examined learning curves for dosimetric parameters and operation time after introduction of intraoperatively built custom-linked (IBCL) seeds. Data from consecutive patients treated with seed implantation before and after introduction of IBCL seeds (loose seed, n = 428; IBCL seed, n = 426) were collected from 13 centers. Dose-volume histogram parameters, operation times, and seed migration rates were compared before and after introduction of IBCL seeds. At the 1-month CT analysis, no significant differences were seen in dose to 90% of prostate volume between before and after IBCL seed introduction. No learning curve for dosimetry was seen. Prostate and rectal volume receiving at least 150% of prescription dose (V150 and RV150) were higher in the loose-seed group than in the IBCL-seed group. Operation time was extended by up to 10 min when IBCL seeds were used, although there was a short learning curve of about five patients. The percentage of patients with seed migration in the IBCL-seed group was one-tenth that in the loose-seed group. Our study revealed no dosimetric demerits, no learning curve for dosimetry, and a slightly extended operation time for IBCL seeds. A significant reduction in the rate of seed migration was identified in the IBCL-seed group.

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