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resolutionpixel

Finding image resolution?

The picture that I need to use is 240mm x 240mm, with 120 pixels in each direction. Apparently this resolution is somehow good enough for an-in-depth MRI brain scan, so my college lab is asking me to calculate it's resolution. I know that the formula for resolution is meters/number of pixels, but I calculated 2mm for the resolution, and I do not think that is correct. What am I doing wrong?

edit: The question asks what the image resolution in pixel size is.

Solution

  • You can calculate it as follows:

    120 pixels per 240 mm is 0.5 pixel per mm. (120/240)

    Resolution is defined as dots per inch (DPI). 0.5 pixel per mm is 12.7 pixels per inch (0.5 x 25.4 mm)

    So your resolution is 12.7 DPI. Not much but apparently good enough for MRI.