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

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Text this: Boundary detection in echocardiographic images by directional gradient vector flow