Wang W, Brown B H, Leathard A D, Lu L
Department of Medical Physics and Clinical Engineering, Sheffield University, Royal Hallamshire Hospital, UK.
Physiol Meas. 1994 May;15 Suppl 2a:A211-6. doi: 10.1088/0967-3334/15/2a/026.
We first describe experiments designed to measure the spatial distribution of noise within an electrical impedance tomographic image of a saline-filled tank. These experiments show that the noise increases by a factor of up to 30 from the periphery towards the centre of the image. We then propose a method of noise equalization that depends upon spending longer collecting the smaller potentials than the larger potentials. The method is tested and shown to give an improvement in noise uniformity of about 16 dB.
我们首先描述了旨在测量充满盐水的水箱的电阻抗断层图像内噪声空间分布的实验。这些实验表明，从图像边缘向中心，噪声增加了高达30倍。然后，我们提出了一种噪声均衡方法，该方法依赖于花费更长的时间来采集较小的电位，而不是较大的电位。该方法经过测试，结果表明其噪声均匀性提高了约16分贝。
