Heres H Maarten, Sjoerdsma Marloes, Schoots Thijs, Rutten Marcel C M, van de Vosse Frans N, Lopata Richard G P
Cardiovascular Biomechanics Group, Department of Biomedical Engineering, Eindhoven University of Technology, Groene Loper, 5612 AP, Eindhoven, The Netherlands.
Department of Cardiology, Máxima Medical Centre, Veldhoven, The Netherlands.
J Med Ultrason (2001). 2020 Jan;47(1):47-56. doi: 10.1007/s10396-019-00983-x. Epub 2019 Nov 7.
In dynamic musculoskeletal sonography, probe fixation can contribute to field of view (FOV) consistency, which is necessary for valid analysis of architectural parameters. In this volunteer study, the achieved FOV consistency in fixated ultrasonography was quantified and compared with freehand acquisition.
During five resting periods during cycling exercise, longitudinal B-mode images of the vastus lateralis (VL) muscle were acquired on one thigh with a fixated probe, and by two trained observers on the other thigh. In each acquisition, the structural similarity compared to the first resting period was determined using the complex wavelet structural similarity index (CW-SSIM). Also, the pennation angle of the VL was measured. Both CW-SSIM and pennation angle were compared between fixated and freehand acquisition. Furthermore, the compression of tissue by the probe fixation was measured.
In fixated acquisition, a significantly higher structural similarity (p < 0.05) and an improved repeatability of pennation angle measurement were obtained compared to freehand acquisition. Probe fixation compressed muscle tissue by 12% on average.
Quantification of the structural similarity showed an increase in FOV consistency with sonography compared to freehand acquisition. The demonstrated feasibility of long-term fixated acquisition might be attractive in many medical fields and sports, and for reduction of work-related ergonomic problems among sonographers.
在动态肌肉骨骼超声检查中，探头固定有助于保持视野（FOV）的一致性，这对于有效分析结构参数是必要的。在这项志愿者研究中，对固定超声检查中实现的视野一致性进行了量化，并与徒手采集进行了比较。
在自行车运动的五个休息期间，使用固定探头在一条大腿上采集股外侧肌（VL）的纵向B模式图像，并由两名训练有素的观察者在另一条大腿上进行采集。在每次采集中，使用复小波结构相似性指数（CW-SSIM）确定与第一个休息期相比的结构相似性。此外，还测量了VL的羽状角。比较了固定采集和徒手采集之间的CW-SSIM和羽状角。此外，还测量了探头固定对组织的压迫情况。
与徒手采集相比，在固定采集中获得了显著更高的结构相似性（p < 0.05）和改善的羽状角测量重复性。探头固定平均使肌肉组织压缩了12%。
结构相似性的量化表明，与徒手采集相比，超声检查的视野一致性有所提高。长期固定采集所展示的可行性在许多医学领域和体育运动中可能具有吸引力，并且有助于减少超声检查人员与工作相关的人体工程学问题。
