采用回声隐藏法在音频中嵌入秘密信息，其中echo为经典回声核，echo2为双极性回声核，echo3为双向回声核-Echo hiding method using secret information is embedded in the audio, in which the echo echo classic nuclear, echo2 bipolar echo nuclear, echo3 bidirectional echo nuclear

3D切片重建。可显示4x8的为echo3 的脑切片图阵-Reconstruction of multi-slice 3D images