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Urethral identification using three-dimensional magnetic resonance imaging and interfraction urethral motion evaluation for prostate stereotactic body radiotherapy

Prostatic urethra identification is crucial in prostate stereotactic body radiotherapy (SBRT) to reduce the risk of urinary toxicity. Although computed tomography (CT) with a catheter is commonly employed, it is invasive, and catheter placement may displace the urethral position, resulting in possib...

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Autores principales: Kato, Yutaka, Okumiya, Shintaro, Okudaira, Kuniyasu, Ito, Junji, Kumagai, Motoki, Kamomae, Takeshi, Noguchi, Yumiko, Kawamura, Mariko, Ishihara, Shunichi, Naganawa, Shinji
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Nagoya University 2023
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10565580/
https://www.ncbi.nlm.nih.gov/pubmed/37829483
http://dx.doi.org/10.18999/nagjms.85.3.504
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author Kato, Yutaka
Okumiya, Shintaro
Okudaira, Kuniyasu
Ito, Junji
Kumagai, Motoki
Kamomae, Takeshi
Noguchi, Yumiko
Kawamura, Mariko
Ishihara, Shunichi
Naganawa, Shinji
author_facet Kato, Yutaka
Okumiya, Shintaro
Okudaira, Kuniyasu
Ito, Junji
Kumagai, Motoki
Kamomae, Takeshi
Noguchi, Yumiko
Kawamura, Mariko
Ishihara, Shunichi
Naganawa, Shinji
author_sort Kato, Yutaka
collection PubMed
description Prostatic urethra identification is crucial in prostate stereotactic body radiotherapy (SBRT) to reduce the risk of urinary toxicity. Although computed tomography (CT) with a catheter is commonly employed, it is invasive, and catheter placement may displace the urethral position, resulting in possible planning inaccuracies. However, magnetic resonance imaging (MRI) can overcome these weaknesses. Accurate urethral identification and minimal daily variation could ensure a highly accurate SBRT. In this study, we investigated the usefulness of a three-dimensional (3D) T2-weighted (T2W) sequence for urethral identification, and the interfractional motion of the prostatic urethra on CT with a catheter and MRI without a catheter for implementing noninvasive SBRT. Thirty-two patients were divided into three groups. The first group underwent MRI without a catheter to evaluate urethral identification by two-dimensional (2D)- and 3D-T2W sequences using mean slice-wise Hausdorff distance (MSHD) and Dice similarity coefficient (DSC) of the contouring by two operators and using visual assessment. The second group provided 3-day MRI data without a catheter using 3D-T2W, and the third provided 3-day CT data with a catheter to evaluate the interfractional motion using MSHD, DSC, and displacement distance (Dd). The MSHD and DSC for the interoperator variability in urethral identification and visual assessment were superior in 3D-T2W than in 2D-T2W. Regarding interfractional motion, the Dd value for prostatic urethra was smaller in MRI than in CT. These findings indicate that the 3D-T2W yielded adequate prostatic urethral identification, and catheter-free MRI resulted in less interfractional motion, suggesting that 3D-T2W MRI without a catheter is a feasible noninvasive approach to performing prostate SBRT.
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spelling pubmed-105655802023-10-12 Urethral identification using three-dimensional magnetic resonance imaging and interfraction urethral motion evaluation for prostate stereotactic body radiotherapy Kato, Yutaka Okumiya, Shintaro Okudaira, Kuniyasu Ito, Junji Kumagai, Motoki Kamomae, Takeshi Noguchi, Yumiko Kawamura, Mariko Ishihara, Shunichi Naganawa, Shinji Nagoya J Med Sci Original Paper Prostatic urethra identification is crucial in prostate stereotactic body radiotherapy (SBRT) to reduce the risk of urinary toxicity. Although computed tomography (CT) with a catheter is commonly employed, it is invasive, and catheter placement may displace the urethral position, resulting in possible planning inaccuracies. However, magnetic resonance imaging (MRI) can overcome these weaknesses. Accurate urethral identification and minimal daily variation could ensure a highly accurate SBRT. In this study, we investigated the usefulness of a three-dimensional (3D) T2-weighted (T2W) sequence for urethral identification, and the interfractional motion of the prostatic urethra on CT with a catheter and MRI without a catheter for implementing noninvasive SBRT. Thirty-two patients were divided into three groups. The first group underwent MRI without a catheter to evaluate urethral identification by two-dimensional (2D)- and 3D-T2W sequences using mean slice-wise Hausdorff distance (MSHD) and Dice similarity coefficient (DSC) of the contouring by two operators and using visual assessment. The second group provided 3-day MRI data without a catheter using 3D-T2W, and the third provided 3-day CT data with a catheter to evaluate the interfractional motion using MSHD, DSC, and displacement distance (Dd). The MSHD and DSC for the interoperator variability in urethral identification and visual assessment were superior in 3D-T2W than in 2D-T2W. Regarding interfractional motion, the Dd value for prostatic urethra was smaller in MRI than in CT. These findings indicate that the 3D-T2W yielded adequate prostatic urethral identification, and catheter-free MRI resulted in less interfractional motion, suggesting that 3D-T2W MRI without a catheter is a feasible noninvasive approach to performing prostate SBRT. Nagoya University 2023-08 /pmc/articles/PMC10565580/ /pubmed/37829483 http://dx.doi.org/10.18999/nagjms.85.3.504 Text en https://creativecommons.org/licenses/by-nc-nd/4.0/This is an Open Access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License. To view the details of this license, please visit (http://creativecommons.org/licenses/by-nc-nd/4.0/ (https://creativecommons.org/licenses/by-nc-nd/4.0/) ).
spellingShingle Original Paper
Kato, Yutaka
Okumiya, Shintaro
Okudaira, Kuniyasu
Ito, Junji
Kumagai, Motoki
Kamomae, Takeshi
Noguchi, Yumiko
Kawamura, Mariko
Ishihara, Shunichi
Naganawa, Shinji
Urethral identification using three-dimensional magnetic resonance imaging and interfraction urethral motion evaluation for prostate stereotactic body radiotherapy
title Urethral identification using three-dimensional magnetic resonance imaging and interfraction urethral motion evaluation for prostate stereotactic body radiotherapy
title_full Urethral identification using three-dimensional magnetic resonance imaging and interfraction urethral motion evaluation for prostate stereotactic body radiotherapy
title_fullStr Urethral identification using three-dimensional magnetic resonance imaging and interfraction urethral motion evaluation for prostate stereotactic body radiotherapy
title_full_unstemmed Urethral identification using three-dimensional magnetic resonance imaging and interfraction urethral motion evaluation for prostate stereotactic body radiotherapy
title_short Urethral identification using three-dimensional magnetic resonance imaging and interfraction urethral motion evaluation for prostate stereotactic body radiotherapy
title_sort urethral identification using three-dimensional magnetic resonance imaging and interfraction urethral motion evaluation for prostate stereotactic body radiotherapy
topic Original Paper
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10565580/
https://www.ncbi.nlm.nih.gov/pubmed/37829483
http://dx.doi.org/10.18999/nagjms.85.3.504
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