Authors' Note: Absorption of rays by body tissues complicates the interpretation of medical imaging with Positron Emission Tomography (PET). In equipment development since the year 2000, 'hybrid' scanners combine the nuclear camera with a CT x-ray unit that provides maps of attenuation; this technique for correction of attenuation (known to workers in the field as A.C.), makes PET more accurate in the detection of cancer. A potential limitation, the much lower energy of the photons used for x-ray CT, turns out to have little degrading effect in practical usage.
Moreover, anatomic localization of the lesion can be obtained at the same session, enabling techniques such as superposition of the ‘hot’ focus on a 3D anatomic body-map. This technique has been given the difficult and somewhat redundant term ‘PET-CT’.
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