Tagged: artificial intelligence

Training neural networks for computer-aided diagnosis: experience in the intelligence community

Neural networks are often used in computer-aided diagnosis (CAD) systems for detecting clinically significant objects. They have also been applied in the AI community to cue image analysts (IAs) for assisted target recognition and wide-area searching. Given the similarity between the applications in the two communities, there are a number of common issues that must be considered when training these neural networks. Two such issues are: (1) exploiting information at multiple scales (e.g. context and detail structure), and (2) dealing with uncertainty (e.g. errors in truth data). We address these two issues, transferring architectures and training algorithms originally developed for assisting IAs in search applications, to improve CAD for mammography. These include hierarchical pyramid neural net (HPNN) architectures that automatically learn and integrate multi-resolution features for improving microcalcification and mass detection in CAD systems. These networks are trained using an uncertain object position (UOP) error function for the supervised learning of image searching/detection tasks when the position of the objects to be found is uncertain or ill-defined. The results show that the HPNN architecture trained using the UOP error function reduces the false-positive rate of a mammographic CAD system by 30%-50% without any significant loss in sensitivity. We conclude that the transfer of assisted target recognition technology from the AI community to the medical community can significantly impact the clinical utility of CAD systems.

Neuro-Robotic Technologies and Social Interactions

The current bandwidth for understanding cognitive and emotional context of a person is much more limited between robots and humans than among humans. Advances in human sensing technologies over the past two decades hold promise for providing online and unique information sources that can lead to deeper insights into human cognitive and emotional state than are currently attainable. However, blind application of the human sensing technologies alone is not a solution. Here, we focus on the integration of neuroscience with robotic technologies for improving social interactions. We discuss the issue of uncertainty in human state detection and the need to develop approaches to estimate and integrate knowledge of that uncertainty. We illustrate this by discussing two application areas and the potential neuro-robotic technologies that could be developed within them