Abstract:
In Part I of this two-part series, we report the design of a probabilistic reformulation
of the Quick Medical Reference (QMR) diagnostic decision-support tool. We describe
a two-level multiply connected belief-network representation of the QMR knowledge
base of internal medicine. In the belief-network representation of the QMR knowledge
base, we use probabilities derived from the QMR disease profiles, from QMR imports
of findings, and from National Center for Health Statistics hospital-discharge statistics.
We use a stochastic simulation algorithm for inference on the belief network. This
algorithm computes estimates of the posterior marginal probabilities of diseases given
a set of findings. In Part II of the series, we compare the performance of QMR to
that of our probabilistic system on cases abstracted from continuing medical education
materials from Scientific American Medicine. In addition, we analyze empirically several
components of the probabilistic model and simulation algorithm.
Key-Words
Expert Systems - Computer-aided Diagnosis - Probabilistic Inference - Belief Networks