Asim F. Choudhri MD, Presenter: Nothing to Disclose

K. Derek Kreitel MD, Abstract Co-Author: Nothing to Disclose

Rourke McQuire Stay MD, Abstract Co-Author: Nothing to Disclose

Christopher Pattrin Ho MD, Abstract Co-Author: Nothing to Disclose

Patrick T. Norton MD, Abstract Co-Author: Nothing to Disclose

Radiologists are often asked if a study is “positive” or “negative,” however many studies can not be interpreted in such a simple manner. Sensitivity, specificity, ROC curves, and positive and negative predictive values must be understood when interpreting a study. We developed a learning module to help radiologists better understand statistic

Interactive quiz that teaches about statistical concepts using real-world examples encountered on a daily basis in radiology departments. Examples include: what to do with 3mm pulmonary nodules, whether to treat a 4.5cm abdominal aortic aneurysm, what does a “low probability” VQ scan mean. Statistical parameters for each case will be presented, along with a discussion of interpretation in clinical practice.

Radiology is evolving into a field with an increased emphasis on evidenced-based practice. Radiologists must understand the properties required of a screening test versus a confirmation exam. Depending upon the sensitivity and specificity desired from a given test, thresholds of interpretation will vary. An educational module using radiology-based examples is a beneficial teaching tool for statistical concepts that radiologists must understand to provide clinically relevant results.

Choudhri, A, Kreitel, K, Stay, R, Ho, C, Norton, P, What Does a "Negative" Result Mean? Evidence-based Radiology Means We Need to Understand Statistics.  Radiological Society of North America 2007 Scientific Assembly and Annual Meeting, November 25 - November 30, 2007 ,Chicago IL. http://archive.rsna.org/2007/5014875.html