OBJECTIVE A very high-resolution (70 MHz) ultrasound device (VHRUS) has recently been approved for use in humans. The aim of this study was to use VHRUS to collect data on healthy subjects to propose some reference values for the digital branches of the median nerves of the hand. METHODS A VHRUS with 70 MHz linear array transducer was used to measure the cross sectional area of the median nerve at the wrist (CSAw) and digital branches (CSAf), largest and smallest fascicles, the fascicles number (Nfasc), the fascicle density (FD), the flattening ratio (FR) and CSAw/CSAf. RESULTS Data from 20 healthy subjects were obtained for both hands. The median nerve at the wrist and digital branches were properly identified without anatomical alterations. No differences were found between the right and the left hand. In the dominant hand, CSAw was 9.35 mm2 (4.57-12.35) and Nfasc was 24 (18-38). FD and FR were respectively 2.94 (2.47-4.91) and 2.74 (1.70-4.90). CONCLUSION VHRUS technology can visualize the median nerves at the wrist, their internal structure and their small branches at the fingers, providing both a qualitative and quantitative assessment. Results from this study provide preliminary reference values in a young healthy sample. SIGNIFICANCE Most conventional ultrasound devices are not able to properly visualize the distal branches of the median nerve. In contrast, VHRUS allows to detect and measure smaller structures of the nerve, assisting in clinical practice.

中文翻译：

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远端正中神经的超高分辨率超声

目标 一种超高分辨率 (70 MHz) 超声设备 (VHRUS) 最近已被批准用于人体。本研究的目的是使用 VHRUS 收集健康受试者的数据，为手部正中神经的数字分支提出一些参考值。方法采用70 MHz线阵换能器VHRUS测量腕正中神经截面积（CSAw）和指支（CSAf）、最大和最小束、束数（Nfasc）、束密度（ FD)、扁平率 (FR) 和 CSAw/CSAf。结果 获得了 20 名健康受试者的双手数据。手腕和手指分支的正中神经被正确识别，没有解剖学改变。右手和左手之间没有发现差异。在优势方面，CSAw 为 9.35 mm2 (4. 57-12.35) 和 Nfasc 是 24 (18-38)。FD 和 FR 分别为 2.94 (2.47-4.91) 和 2.74 (1.70-4.90)。结论 VHRUS 技术可以可视化手腕处的正中神经、它们的内部结构和手指处的小分支，提供定性和定量评估。这项研究的结果提供了年轻健康样本的初步参考值。意义 大多数传统超声设备无法正确显示正中神经的远端分支。相比之下，VHRUS 允许检测和测量较小的神经结构，有助于临床实践。它们的内部结构和手指上的小分支，提供了定性和定量的评估。这项研究的结果提供了年轻健康样本的初步参考值。意义 大多数传统超声设备无法正确显示正中神经的远端分支。相比之下，VHRUS 允许检测和测量较小的神经结构，有助于临床实践。它们的内部结构和手指上的小分支，提供了定性和定量的评估。这项研究的结果提供了年轻健康样本的初步参考值。意义 大多数传统超声设备无法正确显示正中神经的远端分支。相比之下，VHRUS 允许检测和测量较小的神经结构，有助于临床实践。