Abstract
The signal-containing random-dot model is applied to an evaluation of theoretical detectabilities of computer-generated random-dot pattern images that are idealized nuclear-medicine images. Theoretical detectabilities, which can be obtained by a signal-containing random-dot model, are calculated for two simulated observation procedures of these patterns. One simulates the observation procedure in which the observer compares the transmittance at a center of the signal and the transmittance at a background-noise region far away from the signal. The other simulates the observation procedure in which the observer notices the transmittance difference across the boundary between the signal and the background noise. The theoretical detectability is compared with the result of the receiver operating characteristics analysis. The results of receiver operating characteristics analysis are in good agreement with the theoretical detectability obtained by the observation procedure in which the observer notices the transmittance difference across the boundary between the signal and the background noise.
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