Kuchiwaki H, Inao S, Ishii N, Ogura Y, Gu S P
Department of Neurosurgery, Nagoya University School of Medicine, Japan.
J Ultrasound Med. 1997 Nov;16(11):725-30. doi: 10.7863/jum.1997.16.11.725.
We measured changes in dural thickness to estimate intracranial pressure. The dural thickness on magnetic resonance imaging with contrast enhancement was compared in a hydrocephalic patient before and after shunt operation. Dural thickness also was measured directly using a micrometer at craniotomy for aneurysmal clipping in 11 patients. A small ultrasound probe (5 MHz) was held against the temporal scalp of 10 volunteers to extract convoluted interference echoes from the dura mater using a computer--based system for fast Fourier transform-Cepstrum analysis and maximum entropy analysis. The degree of intracranial pressure in the supine position was varied in the volunteers with transient neck compression. The enhanced dural thickness of the patient with hydrocephalus, barely visualized before shunt operation, increased after surgery. Dural thickness measurements obtained ultrasonographically in the supine position were similar to direct measurements of thickness. Changes in dural thickness on ultrasonography reflect changes in intracranial pressure.
我们测量硬脑膜厚度的变化以估计颅内压。对一名脑积水患者在分流手术前后进行了增强磁共振成像检查，并比较了硬脑膜厚度。还对11例接受动脉瘤夹闭开颅手术的患者在开颅时直接使用千分尺测量硬脑膜厚度。将一个小型超声探头（5兆赫）贴在10名志愿者的颞部头皮上，利用基于计算机的快速傅里叶变换-倒谱分析和最大熵分析系统从硬脑膜提取卷积干涉回波。对志愿者进行短暂颈部压迫，改变其仰卧位时的颅内压程度。脑积水患者术前几乎看不到增强的硬脑膜厚度，术后增加。仰卧位超声测量的硬脑膜厚度与直接测量的厚度相似。超声检查中硬脑膜厚度的变化反映了颅内压的变化。
