Analysis of factors limiting the geometric resolution of a positron imaging device

Large-area, positron-sensitive detectors are used in annihilation coincidence systems for studies with positron-decay radiopharmaceuticals. Factors which limit the spatial resolution in such systems are analyzed. These factors include: (1) the intrinsic spatial resolution of the detector, (2) parallax errors, (3) range of positrons in tissue, and (4) angular deviation of the coincident photon pair from colinearity

Some new insights into collimator design

Relationships among collimator design parameters, physical properties of the resulting images, and human observer performance are discussed. The insight provided by these relationships hopefully will prove useful to the individual who must design or select a collimator for a particular imaging task. (GHT