Sampling in cylindrical 2D PET
نویسندگان
چکیده
In this paper, we study 2D cylindrical Positron Emission Tomography (2D PET) sampling. We show that rectangular sampling schemes are more efficient than usual square schemes. 1. PET and sampling 1.1 PET The aim of Positron Emission Tomography (PET) is to map the internal nuclear activity of a patient from exterior measurement. Usually, the patient received some nuclear substance by inhalation or injection. In PET this substance is tagged with a radioactive isotope, such as Carbon-11, Fluorine-18, Oxygen-15. This substance has also chemical and biological properties that enable to visualize metabolism and functions of patient organs (such as blood flow). This substance, called radiotracer, emits a positron per decay. The positron annihilates with an electron, which results in the emission of two opposite gamma rays detected in a PET system. Thanks to detectors surrounding the patient and a powerful electronic processing, coincident photon pairs can be sorted, meaning that the emission occurred on the line joining both detectors.
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