An improved uptake probe designed for a large crystal rectilinear scanner

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Abstract
Stationary probes are frequently used to estimate uptake of radionuclides in particular organs such as the liver, spleen, heart or thyroid. Conventional probes have a non-uniform response volume along the detector axis and a large diverging field of view. The sensitivity of these probes is strongly dependent on organ depth and extent of activity in surrounding tissues. A focused probe which can be used to give an improved response relative to organ depth and reduces the effect of the surrounding activity is described. Phantom measurements suggest that under suitable circumstances the probe may be used to measure absolute organ activity.