| 摘要 |
Method for deriving the amount of dense tissue from a digital mammographic image representation. A region of interest in the image is determined and for each pixel in each location (x,y) in that region of interest a value h int (x,y) is computed representing the amount of dense tissue below said pixel as h int x y = 2 ¼ fat E - ¼ int E �¢ Log p x y - Log p fat )
wherein p(x,y) represents the pixel value of a pixel at location (x,y) in said digital mammographic image, p fat is a reference fat pixel value, µ fat ,µ int are the linear attenuation coefficients of fat tissue and dense tissue and E is the mono-energetic energy value of the x-ray source at image recording, whereby E and p fat are derived from said digital mammographic image representation. |
