ACOUSTICAL PROPERTIES OF HUMAN SKULL
ACOUSTICAL PROPERTIES OF HUMAN SKULL
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DOI：
10.1121/1.381852
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发表时间：
1978-01-01
影响因子：
2.4
通讯作者：
BARGER, JE
中科院分区：
文献类型：
--
作者：
FRY, FJ;BARGER, JE
在一系列新鲜和随后浸泡福尔马林的人头骨上测量了插入损耗、反射损耗和声速的声学特性。测量频率范围为0.25-6 MHz。大多数研究仅限于2.2兆赫的频率上限。测量声源采用轴对称聚焦光束结构，接收端为直径为3mm的小圆盘型压电陶瓷。聚焦光束的几何和时间特征被研究作为通过颅骨切片的结果。一些头骨被切片，以便研究其各个层的组成部分。一个简单的三层分析模型似乎可以解释插入和反射损失的主要方面。确定成人颅骨缺损的主要特征是松质骨的中间层。该研究证实了先前关于插入损失作为复合颅骨频率函数的研究。该研究为复合头骨及其组成部分中偶极子的声散射特性、声速和频散、头骨组成部分中的衰减系数以及声束通过复合头骨后的畸变和偏移提供了新的定量信息。通过选择合适的频率（0.5-1.0 MHz）和波束配置，显然可以在成人大脑中进行具有临床意义的全脑诊断成像和询问。
The acoustical properties insertion loss, reflection loss and sound speed were measured on a series of fresh and subsequently formalin immersed human skulls. Measurements were made in the frequency range from 0.25-6 MHz. Most studies were restricted to an upper frequency limit of 2.2 MHz. An axisymmetric focused beam configuration was used as the sound source for the measurements and the receivers were small disk-type (3 mm diameter) piezoelectric ceramics. The geometric and temporal character of the focused beam was studied as a consequence of passage through the skull sections. Some skulls were sectioned so that their individual layer components could be studied. A simple 3-layer analytical model seemed to explain the major aspects of insertion and reflection loss. The dominant feature in determining human adult skull losses was the middle layer (diploe) of cancellous bone. This study corroborated previous work on insertion loss as a function of frequency for composite skull. The study provided new quantitative information on the acoustic scattering properties of diploe, sound velocity and dispersion in composite skull and its components, attenuation coefficients in skull components and sound-beam distortion and shifts after transmission through composite skull. With selection of appropriate frequencies (0.5-1.0 MHz) and beam configuration it apparently will be possible to perform clinically significant transkull diagnostic imaging and interrogation in the adult human brain.