三维磁共振成像的尿道识别和前列腺立体定向体放射治疗中尿道运动评估。

IF 0.9 4区 医学 Q4 MEDICINE, RESEARCH & EXPERIMENTAL Nagoya Journal of Medical Science Pub Date : 2023-08-01 DOI:10.18999/nagjms.85.3.504
Yutaka Kato, Shintaro Okumiya, Kuniyasu Okudaira, Junji Ito, Motoki Kumagai, Takeshi Kamomae, Yumiko Noguchi, Mariko Kawamura, Shunichi Ishihara, Shinji Naganawa
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引用次数: 0

摘要

前列腺尿道识别在前列腺立体定向体放射治疗(SBRT)中至关重要,以降低尿毒性的风险。尽管通常使用带导管的计算机断层扫描(CT),但它具有侵入性,并且导管的放置可能会使尿道位置移位,从而导致可能的计划不准确。然而,磁共振成像(MRI)可以克服这些弱点。准确的尿道识别和最小的每日变异可以确保高度准确的SBRT。在本研究中,我们研究了三维(3D)T2加权(T2W)序列在尿道识别中的有用性,以及在有导管的CT和无导管的MRI上前列腺尿道的交叉运动,以实现无创SBRT。32名患者被分为三组。第一组在没有导管的情况下接受MRI检查,通过二维(2D)和3D-T2W序列评估尿道识别,使用两名操作员轮廓的平均切片Hausdorff距离(MSHD)和Dice相似系数(DSC),并使用视觉评估。第二组使用3D-T2W在没有导管的情况下提供了3天的MRI数据,第三组使用MSHD、DSC和位移距离(Dd)提供了有导管的3天CT数据以评估交叉运动。MSHD和DSC在尿道识别和视觉评估的互操作变异性方面在3D-T2W中优于2D-T2W。关于交叉运动,MRI中前列腺尿道的Dd值小于CT。这些发现表明,3D-T2W可以充分识别前列腺尿道,而无导管MRI导致较少的交叉运动,这表明无导管的3D-T2WMRI是一种可行的无创前列腺SBRT方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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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 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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来源期刊
Nagoya Journal of Medical Science
Nagoya Journal of Medical Science MEDICINE, RESEARCH & EXPERIMENTAL-
CiteScore
1.30
自引率
0.00%
发文量
65
审稿时长
>12 weeks
期刊介绍: The Journal publishes original papers in the areas of medical science and its related fields. Reviews, symposium reports, short communications, notes, case reports, hypothesis papers, medical image at a glance, video and announcements are also accepted. Manuscripts should be in English. It is recommended that an English check of the manuscript by a competent and knowledgeable native speaker be completed before submission.
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