Jemec G B, Serup J
Department of Dermatology, Rigshospitalet, Copenhagen, Denmark.
Arch Dermatol. 1989 May;125(5):643-6.
The structure of the normal human nail plate is described using an ultrasound scanner (20 MHz A). Postmortem studies, including examination of nail plate biopsy specimens before and after desiccation, were performed and compared with in vivo structures. Two compartments could be identified in the nail, ie, a dry and superficial compartment with the ultrasound velocity of 3103 m/s and a humid and deeper compartment with an ultrasound velocity of 2125 m/s. The ultrasound velocity of the entire nail was 2459 m/s, and the water content was 35% wt/wt. Underneath the nail, echoes from the nail bed were seen. Ultrasound was concluded useful for noninvasive measurement of nail thickness and examination of internal nail structure.
使用超声扫描仪（20兆赫兹A）描述了正常人类指甲板的结构。进行了包括干燥前后指甲板活检标本检查在内的死后研究，并与体内结构进行了比较。在指甲中可识别出两个部分，即超声速度为3103米/秒的干燥浅表部分和超声速度为2125米/秒的湿润较深部分。整个指甲的超声速度为2459米/秒，含水量为35%（重量/重量）。在指甲下方，可以看到来自甲床的回声。得出结论，超声对于无创测量指甲厚度和检查指甲内部结构很有用。
