B 型超声扫描过程中人类观察者对时间噪声的敏感性:特征描述和成像影响。

IF 2.5 4区 医学 Q1 ACOUSTICS Ultrasonic Imaging Pub Date : 2024-05-01 Epub Date: 2024-03-18 DOI:10.1177/01617346241236160
Matthew T Huber, Katelyn M Flint, Patricia J McNally, Sarah C Ellestad, Gregg E Trahey
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引用次数: 0

摘要

这项工作测量的是时间信噪比(SNR)阈值,该阈值表明超声波扫描过程中的随机噪声何时变得难以被人类专业观察者察觉。可见噪声会影响图像质量,并可能导致扫描无法诊断。噪声既可能来自稳定的声源(杂波),也可能来自随机变化的电子源(时间噪声)。大量的工程工作都集中在降低这两类噪声上。在这项工作中,对五名执业超声技师进行了观察研究,以评估超声技师对超声胶片中时间噪声的敏感性。了解在超声成像过程中时间噪声不再可见的条件,可为工程设计提供参考,从而最大限度地减少噪声对图像质量的影响。向超声技师展示成对的无时间噪声和有噪声的模拟斑点成像片段,并要求他们选择有噪声的片段。结果发现,成像目标的运动程度对感受到噪声的信噪比水平有显著影响,而改变成像频率则影响不大。在真实的活体运动水平下,信噪比在 28 分贝及以上的电影片段不会出现时间噪声。在本文介绍的案例研究中,基于噪声感知阈值的自适应强度调整潜力在胎儿成像场景中得到了验证。这项研究展示了如何应用噪声感知阈值来帮助设计或调整超声系统,以适应不同的成像任务和噪声条件。
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Human Observer Sensitivity to Temporal Noise During B-Mode Ultrasound Scanning: Characterization and Imaging Implications.

This work measures temporal signal-to-noise ratio (SNR) thresholds that indicate when random noise during ultrasound scanning becomes imperceptible to expert human observers. Visible noise compromises image quality and can potentially lead to non-diagnostic scans. Noise can arise from both stable acoustic sources (clutter) or randomly varying electronic sources (temporal noise). Extensive engineering effort has focused on decreasing noise in both of these categories. In this work, an observer study with five practicing sonographers was performed to assess sonographer sensitivity to temporal noise in ultrasound cine clips. Understanding the conditions where temporal noise is no longer visible during ultrasound imaging can inform engineering efforts seeking to minimize the impact this noise has on image quality. The sonographers were presented with paired temporal noise-free and noise-added simulated speckle cine clips and asked to select the noise-added clips. The degree of motion in the imaging target was found to have a significant effect on the SNR levels where noise was perceived, while changing imaging frequency had little impact. At realistic in vivo motion levels, temporal noise was not perceived in cine clips at and above 28 dB SNR. In a case study presented here, the potential of adaptive intensity adjustment based on this noise perception threshold is validated in a fetal imaging scenario. This study demonstrates how noise perception thresholds can be applied to help design or tune ultrasound systems for different imaging tasks and noise conditions.

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来源期刊
Ultrasonic Imaging
Ultrasonic Imaging 医学-工程:生物医学
CiteScore
5.10
自引率
8.70%
发文量
15
审稿时长
>12 weeks
期刊介绍: Ultrasonic Imaging provides rapid publication for original and exceptional papers concerned with the development and application of ultrasonic-imaging technology. Ultrasonic Imaging publishes articles in the following areas: theoretical and experimental aspects of advanced methods and instrumentation for imaging
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