Dr. Gallas provides mathematical, statistical, and modeling expertise to the evaluation of medical imaging devices at the FDA. His main areas of contribution are in the design and statistical analysis of reader studies, image quality, computer aided diagnosis (CAD), and imaging physics. He has a PhD from the University of Arizona Graduate Interdisciplinary Program in Applied Mathematics.
Uncertainty in the assessment of immunohistochemical staining with optical and digital microscopy: lessons from a reader study
Multireader multicase reader studies with binary agreement data: simulation, analysis, validation, and sizing
Generalized Roe and Metz receiver operating characteristic model: analytic link between simulated decision scores and empirical AUC variances and covariances
Statistical properties of a utility measure of observer performance compared to area under the ROC curve
Human efficiency for detecting Gaussian signals in non-Gaussian distributed lumpy backgrounds using different display characteristics and scaling methods
Efficiency of the human observer compared to an ideal observer based on a generalized NEQ which incorporates scatter and geometric unsharpness: evaluation with a 2AFC experiment
Signal detection in a lumpy background: effects of providing more information to the human than just raw data