Single-energy metal artifact reduction in postimplant computed tomography for I-125 prostate brachytherapy: Impact on seed identification

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3 Citations (Scopus)

Abstract

Purpose To evaluate the effectiveness of the single-energy metal artifact reduction (SEMAR) technique for improving the accuracy of I-125 seed identification in postimplant computed tomography (CT) after prostate brachytherapy. Methods and Materials Postimplant CT images of 40 patients treated with I-125 prostate brachytherapy were acquired. For all patients, 2 data sets were reconstructed, 1 with SEMAR algorithms (SEMAR image), and the other without SEMAR algorithms (non-SEMAR image). Seed locations are automatically detected by the automatic seed finder tool, and their locations were compared between the SEMAR and non-SEMAR images. Dosimetric parameters using seed locations as detected were compared. Results The true-positive fraction of properly detected seeds on the SEMAR image as determined from a reference seed distribution defined by one investigator was significantly higher than the true-positive fraction on the non-SEMAR image (p = 0.011). The variabilities in D90 (p = 0.001), V100 (p = 0.007), and V150 (p = 0.007) were significantly reduced for seed location on the SEMAR image as compared with non-SEMAR image. Conclusions Prostate postimplant CT with SEMAR improved the accuracy of seed localization and postimplant dosimetric parameters.

Original languageEnglish
Pages (from-to)768-773
Number of pages6
JournalBrachytherapy
Volume15
Issue number6
DOIs
Publication statusPublished - 2016 Nov 1

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Brachytherapy
Artifacts
Prostate
Seeds
Metals
Tomography
Research Personnel

Keywords

  • Brachytherapy
  • I-125
  • Metal artifact reduction
  • Prostate

ASJC Scopus subject areas

  • Oncology
  • Radiology Nuclear Medicine and imaging

Cite this

@article{ac08cd51d2384444851346e275c5708d,
title = "Single-energy metal artifact reduction in postimplant computed tomography for I-125 prostate brachytherapy: Impact on seed identification",
abstract = "Purpose To evaluate the effectiveness of the single-energy metal artifact reduction (SEMAR) technique for improving the accuracy of I-125 seed identification in postimplant computed tomography (CT) after prostate brachytherapy. Methods and Materials Postimplant CT images of 40 patients treated with I-125 prostate brachytherapy were acquired. For all patients, 2 data sets were reconstructed, 1 with SEMAR algorithms (SEMAR image), and the other without SEMAR algorithms (non-SEMAR image). Seed locations are automatically detected by the automatic seed finder tool, and their locations were compared between the SEMAR and non-SEMAR images. Dosimetric parameters using seed locations as detected were compared. Results The true-positive fraction of properly detected seeds on the SEMAR image as determined from a reference seed distribution defined by one investigator was significantly higher than the true-positive fraction on the non-SEMAR image (p = 0.011). The variabilities in D90 (p = 0.001), V100 (p = 0.007), and V150 (p = 0.007) were significantly reduced for seed location on the SEMAR image as compared with non-SEMAR image. Conclusions Prostate postimplant CT with SEMAR improved the accuracy of seed localization and postimplant dosimetric parameters.",
keywords = "Brachytherapy, I-125, Metal artifact reduction, Prostate",
author = "Yutaka Shiraishi and Yoshitake Yamada and Tomoaki Tanaka and Takahisa Eriguchi and Shuichi Nishimura and Kayo Yoshida and Takashi Hanada and Toshio Ohashi and Naoyuki Shigematsu and Masahiro Jinzaki",
year = "2016",
month = "11",
day = "1",
doi = "10.1016/j.brachy.2016.07.006",
language = "English",
volume = "15",
pages = "768--773",
journal = "Brachytherapy",
issn = "1538-4721",
publisher = "Elsevier Inc.",
number = "6",

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TY - JOUR

T1 - Single-energy metal artifact reduction in postimplant computed tomography for I-125 prostate brachytherapy

T2 - Impact on seed identification

AU - Shiraishi, Yutaka

AU - Yamada, Yoshitake

AU - Tanaka, Tomoaki

AU - Eriguchi, Takahisa

AU - Nishimura, Shuichi

AU - Yoshida, Kayo

AU - Hanada, Takashi

AU - Ohashi, Toshio

AU - Shigematsu, Naoyuki

AU - Jinzaki, Masahiro

PY - 2016/11/1

Y1 - 2016/11/1

N2 - Purpose To evaluate the effectiveness of the single-energy metal artifact reduction (SEMAR) technique for improving the accuracy of I-125 seed identification in postimplant computed tomography (CT) after prostate brachytherapy. Methods and Materials Postimplant CT images of 40 patients treated with I-125 prostate brachytherapy were acquired. For all patients, 2 data sets were reconstructed, 1 with SEMAR algorithms (SEMAR image), and the other without SEMAR algorithms (non-SEMAR image). Seed locations are automatically detected by the automatic seed finder tool, and their locations were compared between the SEMAR and non-SEMAR images. Dosimetric parameters using seed locations as detected were compared. Results The true-positive fraction of properly detected seeds on the SEMAR image as determined from a reference seed distribution defined by one investigator was significantly higher than the true-positive fraction on the non-SEMAR image (p = 0.011). The variabilities in D90 (p = 0.001), V100 (p = 0.007), and V150 (p = 0.007) were significantly reduced for seed location on the SEMAR image as compared with non-SEMAR image. Conclusions Prostate postimplant CT with SEMAR improved the accuracy of seed localization and postimplant dosimetric parameters.

AB - Purpose To evaluate the effectiveness of the single-energy metal artifact reduction (SEMAR) technique for improving the accuracy of I-125 seed identification in postimplant computed tomography (CT) after prostate brachytherapy. Methods and Materials Postimplant CT images of 40 patients treated with I-125 prostate brachytherapy were acquired. For all patients, 2 data sets were reconstructed, 1 with SEMAR algorithms (SEMAR image), and the other without SEMAR algorithms (non-SEMAR image). Seed locations are automatically detected by the automatic seed finder tool, and their locations were compared between the SEMAR and non-SEMAR images. Dosimetric parameters using seed locations as detected were compared. Results The true-positive fraction of properly detected seeds on the SEMAR image as determined from a reference seed distribution defined by one investigator was significantly higher than the true-positive fraction on the non-SEMAR image (p = 0.011). The variabilities in D90 (p = 0.001), V100 (p = 0.007), and V150 (p = 0.007) were significantly reduced for seed location on the SEMAR image as compared with non-SEMAR image. Conclusions Prostate postimplant CT with SEMAR improved the accuracy of seed localization and postimplant dosimetric parameters.

KW - Brachytherapy

KW - I-125

KW - Metal artifact reduction

KW - Prostate

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