The image generally achieved is presented as a gray scale image of a
cross-section of the object, with the intensity of each picture element
proportional to the isotope concentration at that point in the object. When
unclear images result it may be caused by the quality of the measured
attenuation correction [10, 13] or by poor photon statistics. [11] One method
for correcting blurring in PET images uses an empirically determined, tabulated
relationship between depth-of-interaction and most probable pulse-height for
each detected gamma ray. [12]