Text this: Eigenspace-based minimum variance combined with delay multiply and sum beamformer : application to linear-array photoacoustic imaging

  _____      ___     _    _    _    _    _    _   
 / ____||   / _ \\  | |  | || | || | || | \  / || 
/ //---`'  | / \ || | |/\| || | || | || |  \/  || 
\ \\___    | \_/ || |  /\  || | \\_/ || | .  . || 
 \_____||   \___//  |_// \_||  \____//  |_|\/|_|| 
  `----`    `---`   `-`   `-`   `---`   `-`  `-`