Coleman D J, Lizzi F L
Am J Ophthalmol. 1979 Sep;88(3 Pt 1):369-75. doi: 10.1016/0002-9394(79)90635-4.
We developed a system that permits exceptionally accurate measurements of human choroidal thickness in vivo by means of ultrasound. With minicomputer techniques, the complementary functions of the time and spectral domains of reflected sound can be used to permit measurements accurate to less than 20 mu at 10 MHz center frequency. Even more accuracy can be obtained with higher center frequencies. Choroidal thickness has been found to exceed that previously reported, with typical values of 420 mu found at the posterior pole. Even greater values are seen in regions outside the macula.
我们开发了一种系统，该系统能够通过超声在体内对人脉络膜厚度进行极其精确的测量。利用小型计算机技术，反射声的时域和频谱域的互补功能可用于实现中心频率为10MHz时精确到小于20微米的测量。使用更高的中心频率可以获得更高的精度。已发现脉络膜厚度超过先前报道的值，在后极部典型值为420微米。在黄斑以外的区域可观察到更大的值。
