Volumetric detection tasks with varying complexity: Human observer performance

This study explores detection performance trends of human observers with respect to two parameters: task complexity determined by the frequency content of background and signal, and image viewing mode: single-slice (ss) versus multi-slice (ms) stack-browsing image presentation. The images are 3D correlated Gaussian noise with a 3D Gaussian signal centered in the image volume. We consider three different noise kernels while keeping the signal spread constant across all images. In ss mode, only the central slice of the volume is presented to the observer, while in ms mode all slices are available. All human readings are conducted in a controlled viewing environment on a 5MP digital mammography medical display. Overall, in line with the literature, we find that human performance increases in ms relative to ss image presentation mode. Furthermore, our experiments indicate that the extent of difference between ms and ss performance is influenced by the properties of image data: the difference in performance increases (from Delta AUC= 0.14 to Delta AUC= 0.30) as the difference in the frequency content of the signal and the background increases. Future studies shall focus on comparing the results of the present study to existing observer models for volumetric images, ultimately aiming at designing an anthropomorphic model observer for volumetric detection tasks.