Method of measuring speed of blood flow from RF signal

A method of measuring a speed of blood flow from a radio frequency (RF) signal, the method comprising:

• decomposing a complex signal converted from the RF signal into base signals using singular value decomposition;
• classifying the base signals into a clutter signal, a blood flow signal, and a noise signal;
• separating a clutter region and a blood flow region from the classified clutter signal and blood flow signal, wherein the separating comprises
• obtaining a feature map on a basis of at least one selected from the group consisting of a) the blood flow signal and b) the clutter signal and the blood flow signal, wherein the feature map is obtained by converting an energy map showing energy of the blood flow signal into a decibel scale, and
• obtaining the clutter region and the blood flow region by performing image separation on the feature map;
• obtaining an output signal by removing the blood flow signal from the clutter signal in the clutter region and by removing the clutter signal from the blood flow signal in the blood flow region;
• and
• measuring a speed of the blood flow by calculating speckle decorrelation from the output signal.