Nantes Université, Movement - Interactions - Performance, MIP, UR 4334, F-44000 Nantes, France; Nantes Université, CHU Nantes, Pole de Gérontologie Clinique, F-44000 Nantes, France.
Nantes Université, CHU Nantes, Pole de Gérontologie Clinique, F-44000 Nantes, France; Nantes Université, CHU Nantes, CNRS, INSERM, l'institut du thorax, F-44000 Nantes, France.
J Biomech. 2024 Jan;162:111878. doi: 10.1016/j.jbiomech.2023.111878. Epub 2023 Nov 23.
Freehand 3D ultrasound (3D-US) is a promising technique for measuring muscle volume but it requires gel pads or water tanks to limit probe compression on the skin which makes it hard to use in clinical applications. Our objectives were to measure the effect of different compressions on muscle volume in order to assess the clinical applicability of a minimal compression method for lower limb muscles. 4 muscles of the lower limb on 15 healthy volunteers were scanned with a new commercial freehand 3D-US setup accessible to clinical experimentators. Each muscle was scanned with 3 levels of compression: standard compression, minimal compression and gel pad (method validated against MRI). Volume was calculated using software segmentation tools. Acquisitions and segmentations were done by the same examiner. There was a significant impact of standard compression on volume measurements, but no difference between minimal compression and gel pad. Standard compression underestimated volume with a mean bias of 16 mL. For minimal compression, 75 % of measured differences were below the predefined clinically acceptable limits of 10 mL. Mean bias for this method was 1.1 mL. In conclusion, standard compression in freehand 3D-US induces a systematic bias in volume calculations. But, with a trained examiner and the necessary precautions to minimize compression, this bias could be abolished and become acceptable in clinical applications. When a high accuracy is required, gel pads could still be important to consider.
自由手三维超声（3D-US）是一种很有前途的肌肉体积测量技术，但它需要凝胶垫或水箱来限制探头对皮肤的压缩，这使得它很难在临床应用中使用。我们的目的是测量不同压缩对肌肉体积的影响，以评估一种用于下肢肌肉的最小压缩方法的临床适用性。我们使用一种新的商业自由手 3D-US 设备，对 15 名健康志愿者的下肢 4 块肌肉进行了扫描，该设备可供临床实验者使用。每个肌肉都以 3 个压缩水平进行了扫描：标准压缩、最小压缩和凝胶垫（方法通过 MRI 验证）。使用软件分割工具计算体积。采集和分割由同一位检查者完成。标准压缩对体积测量有显著影响，但最小压缩和凝胶垫之间没有差异。标准压缩对体积的估计存在 16ml 的平均偏差。对于最小压缩，75%的测量差异在预先设定的 10ml 的临床可接受范围内。这种方法的平均偏差为 1.1ml。总之，自由手 3D-US 中的标准压缩会导致体积计算的系统偏差。但是，通过训练有素的检查者和最小化压缩的必要预防措施，可以消除这种偏差，并使其在临床应用中变得可接受。当需要高精度时，凝胶垫仍然是需要考虑的重要因素。
