Integration of spatio-temporal contrast sensitivity with a multi-slice channelized Hotelling observer

摘要

Barten's model of spatio-temporal contrast sensitivity function of humanvisual system is embedded in a multi-slice channelized Hotelling observer. Thisis done by 3D filtering of the stack of images with the spatio-temporalcontrast sensitivity function and feeding the result (i.e., the perceived imagestack) to the multi-slice channelized Hotelling observer. The proposedprocedure of considering spatio-temporal contrast sensitivity function isgeneric in the sense that it can be used with observers other than multi-slicechannelized Hotelling observer. Detection performance of the new observer indigital breast tomosynthesis is measured in a variety of browsing speeds, attwo spatial sampling rates, using computer simulations. Our results show a peakin detection performance in mid browsing speeds. We compare our results tothose of a human observer study reported earlier (I. Diaz et al. SPIE MI 2011).The effects of display luminance, contrast and spatial sampling rate, with andwithout considering foveal vision, are also studied. Reported simulations areconducted with real digital breast tomosynthesis image stacks, as well asstacks from an anthropomorphic software breast phantom (P. Bakic et al. MedPhys. 2011). Lesion cases are simulated by inserting singlemicro-calcifications or masses. Limitations of our methods and ways to improvethem are discussed.