Tomography using approximately coincident annihilation-photon detections to constrain an internal emission distribution. A calibrated model accounts for propagation, detector response, unrelated coincidences and scattering.
A line defined by an approximately coincident detector pair in annihilation-photon tomography. An event constrains a possible annihilation location to that line within instrumental and physical uncertainties. Time-of-flight data can add a position constraint along it; attenuation, scattering and random coincidences change the forward model.
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