Methods of evaluating and comparing the performance of diagnostic tests are of increasing importance in medical science. When a test is based on an observed variable that lies on a continuous scale, an assessment of the overall value of the test can be made through the use of a Receiver Operating Characteristic (ROC) curve. The ROC curve descibes the discrimination ability of a diagnosis test f...

A Receiver Operating Characteristic (ROC) curve reflects the performance of a system which decides between two competing actions in a test of statistical hypothesis. This paper addresses the inference on ROC curves for the following problem: how can one statistically validate the performance of a system with a claimed ROC curve, ROC0 say? Our proposed solution consists of two main components: F...

The Visual Concept Detection Task (VCDT) of ImageCLEF 2008 is described. A database of 2,827 images were manually annotated with 17 concepts. Of these, 1,827 were used for training and 1,000 for testing the automated assignment of categories. In total 11 groups participated and submitted 53 runs. The runs were evaluated using ROC curves, from which the Area Under the Curve (AUC) and Equal Error...

BACKGROUND AND PURPOSE Detection of acute infarction in the posterior circulation is challenging. We aimed to determine the additional value of tomograpy (CT) perfusion to noncontrast CT and CT angiography source images for infarct detection and localization in patients suspected of acute ischemic posterior circulation stroke. METHODS Patients with suspected acute ischemic posterior circulati...

In order to monitor temporal and spatial crustal activities associated with earthquakes, ground- satellite-based monitoring systems have been installed in China since the 1990s. recent years, correlation between strain anomalies local major earthquakes has verified. this study, we further evaluate possibility of containing earthquake precursors by using Receiver Operating Characteristic (ROC) p...