However, the HF subband is created by subtracting the synthesized LF subband from original image but not by 2-D high-pass filtering original image.

但是，高频子带并不是通过2-D高通滤波原始图像，而是通过原始图像与合成的低通子带相减得到的。

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Configuration: 2-way symmetrical, dual LF, triple HF.

配置：2路对称，双低频，三高频。

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Only the latter 2 stages, of course, qualify for the traditional clinical diagnosis of HF for diagnostic or coding purposes.

当然，这种心衰分期方法中只有后两期符合心衰的传统临床诊断。

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