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Scanner performance to overcome efficiency problems in three-dimensional scintigraphy by γ-γ-coincidences

The use of 111In and 169Yb-both nuclides decaying via gamma - gamma -cascades-in positive tumour scintigraphy has lead to consideration of a highly efficient coincidence counting system. The reduced efficiency arising from the coincidence condition was found to be one problem; a second is the rate of random pulses which accompany this reduction. A measurement technique is shown which overcomes these limitations.