Images
are inherently random (unpredictable) for many reasons. If
we image the same object many times with the same imaging system,
we will get unpredictably different images each time because
of the noise that arises from electronic circuitry or detection
of radiation, but in fact the objects and the imaging systems
also vary unpredictably. Information derived from images is
therefore random as well. If we estimate a tumor volume or
compute a linear discriminant function, for example, the result
will be unpredictable because the randomness in the object,
noise and imaging system. A full understanding of the properties
of images and of |
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