Therefore, if a system has a pixel value of 0.5 mm², it means that each pixel in your image corresponds to a 0.5 mm x 0.5 mm square on the real object (assuming square pixels, which is standard).
[ \textPixel Value (mm²) = \left( \frac\textSensor Pixel Pitch (µm)\textOptical Magnification \right)^2 ] pixel value mm2
A number (often 0–255) representing how bright or dark that spot is. In a CT scan, this might represent tissue density (Hounsfield Units). Spatial Value ( mm2m m squared Therefore, if a system has a pixel value of 0
:
If you know the dots per inch (DPI) or pixels per inch (PPI), the formula for the length of one pixel in mm is: pixel (mm) pixel value mm2