The rADC in hyperacute and acute stage of focuscenter was minimized, and increased progressively from center to periphery with gradient sign.
超急性、急性期病灶中心相对表观扩散系数最低,从中心往外逐渐升高呈梯度征。
2
Active noise control (ANC) is a new high technology integrated with acoustic, adaptive control and digital signal process and it has become the research focuscenter of noise control.