Two-dimensional CT measurements are not reliable in the evaluation of small noncalcified pulmonary nodules.

Software volumetric analysis yielded repeatable estimates for 96% of the nodules examined. All software-calculated doubling times were in keeping with the benign or malignant nature of the nodules.

• Unenhanced angiographic MR sequences are very specific and can identify proximal PE. • Contrast-enhanced MR angiographic sequences show high sensitivity for PE diagnosis. • A normal MR perfusion result does not exclude PE. • Inter-reader agreement is better for angiographic than perfusion MR sequences.

Multi-detector row CT enables diagnosis in 91% of cases and identification of isolated subsegmental or chronic PE in a relatively high proportion of patients.