Shuang Yuan CT means that the same machine has two X-ray systems and two tubes, which is usually the structure of Siemens. The advantages are obvious. The scanning time is good, but the disadvantages are obvious. If the damage is troublesome, the maintenance cost is high, because it has one more system than the general machine, and the probability of error is higher.
128CT refers to the number of layers or rows of CT. Because domestic random advertisements deliberately confuse the difference between lines and layers, I don't know whether your 128CT is 128 or 128.