基于声针原型和声压测量的前列腺近距离超声主动跟踪方法。

IF 1.1 4区 医学 Q4 ONCOLOGY
Journal of Contemporary Brachytherapy Pub Date : 2025-02-01 Epub Date: 2025-02-27 DOI:10.5114/jcb.2025.148031
Marek Belohlavek, Minako Katayama, Christopher L Deufel
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引用次数: 0

摘要

目的:本研究探讨声测法是否能够以高线性度、准确度和精密度测量前列腺近距离治疗中主动超声跟踪针原型的位移,并对针相对于直肠内超声探头的运动进行三角测量。材料和方法:声测法检测从主动超声跟踪针(定制的压电跟踪传感器)传输到独立传感器的超声信号的飞行时间(ToF)。在水中测试了与针轴平行和垂直的位移,距离达35毫米。主动超声跟踪针的三维(3D)跟踪利用了一个装有5个压电传感器的模拟直肠内超声探头,并使用声压测量三角测量算法来测量针与探头的距离。结果:超声追踪针的增量位移测量方法线性度高(R≥0.999),准确度高(平均差值≤0.55 mm),精密度高(平均差值的1.96 ×标准差≤0.22 mm)。通过信号反转消除了ToF检测的偶发误触发。通过离线三角测量算法进行的声空间跟踪产生了虚拟的三维线网格,这些线网格在空间上与几个测试时间点超声跟踪的主动针尖运动的相应(地面真实)视频片段紧密重叠。结论:我们引入了一种实验性的主动超声跟踪针,并采用声测法测量了针的位移和三角测量其空间位置。测量和三维空间跟踪为潜在的前列腺近距离治疗应用带来了有希望的结果。临床应用将需要开发自动触发、实时跟踪和商业上可行的声学针设计。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Active ultrasound tracking method for prostate brachytherapy using acoustic needle prototype and sonomicrometry.

Purpose: This study examined whether sonomicrometry can measure displacements of active ultrasound-tracked needle prototype for prostate brachytherapy application with high linearity, accuracy, and precision as well as triangulate the needle's motion relative to intra-rectal ultrasound probe.

Material and methods: Sonomicrometry detects time-of-flight (ToF) of ultrasound signal transmitted from an active ultrasound-tracked needle (customized with a piezo-electric tracking sensor) to independent sensor. The transmission was tested in water for displacements parallel and perpendicular to the needle axis using distances of up to 35 mm. Three-dimensional (3D) tracking of the active ultrasound-tracked needle utilized a simulated intra-rectal ultrasound probe fitted with 5 piezo-electric sensors, and a sonomicrometry triangulation algorithm was used to measure the distances of the needle from the probe.

Results: Incremental displacements of the active ultrasound-tracked needle were measured by sonomicrometry with strong linearity (R ≥ 0.999), high accuracy (mean difference ≤ 0.55 mm), and precision (1.96 × standard deviation of the mean difference ≤ 0.22 mm) compared with a reference. Sporadic false triggering of ToF detection was eliminated by signal inversion. Acoustic spatial tracking by the off-line triangulation algorithm produced virtual 3D wire meshes, which closely spatially overlapped with the corresponding (ground-truth) video clips of active ultrasound-tracked needle movement at several testing time points.

Conclusions: We introduced an experimental active ultrasound-tracked needle and employed sonomicrometry to measure the needle's displacements and triangulate its spatial position. The measurements and 3D spatial tracking yielded promising results for potential prostate brachytherapy applications. Clinical implementation will necessitate developments of automated triggering, real-time tracking, and a commercially viable acoustic needle design.

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来源期刊
Journal of Contemporary Brachytherapy
Journal of Contemporary Brachytherapy ONCOLOGY-RADIOLOGY, NUCLEAR MEDICINE & MEDICAL IMAGING
CiteScore
2.40
自引率
14.30%
发文量
54
审稿时长
16 weeks
期刊介绍: The “Journal of Contemporary Brachytherapy” is an international and multidisciplinary journal that will publish papers of original research as well as reviews of articles. Main subjects of the journal include: clinical brachytherapy, combined modality treatment, advances in radiobiology, hyperthermia and tumour biology, as well as physical aspects relevant to brachytherapy, particularly in the field of imaging, dosimetry and radiation therapy planning. Original contributions will include experimental studies of combined modality treatment, tumor sensitization and normal tissue protection, molecular radiation biology, and clinical investigations of cancer treatment in brachytherapy. Another field of interest will be the educational part of the journal.
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