第四代X—CT机框架转动速度分布如图一。其中(a)是反时针转动(正常扫描时),要求先加速到一定速度,然后保持匀速(利用反馈信号)以采集病人数据,可以是2秒、4秒或8秒,视需要而定。转动360°后即开始减速,一直到停止。(b)是框架返回转动运动,通常是6秒,同样经过加速、匀速、减速,只是为了保证框架能回到起始位置而不冲过头,特意加了一只第二减速开关。 The fourth generation of X-CT frame rotation speed distribution shown in Figure one. (A) is a counter-clockwise rotation (normal scan), requiring a certain speed up to a certain speed, followed by a constant speed (using the feedback signal) to collect patient data, which can be 2, 4 or 8 seconds, as needed. After turning 360 ° began to slow down until it stopped. (b) is the framework to return the turning movement, usually 6 seconds, the same acceleration, uniform speed, deceleration, just to ensure that the frame can return to the starting position without overshooting, deliberately added a second deceleration switch.