Quantitative stereology and radiologic image analysis. Part I: Computerized tomography and ultrasound

The interpretation of two�dimensional radiographs or computerized tomography (CT) or ultrasound (US) sections with inferences made about three�dimensional anatomy is the foundation of diagnostic radiology. A large variety of estimation methods which can be applied to two�dimensional CT/US sections to estimate their three�dimensional properties is presented. The techniques are easily utilized in a research or clinical setting, do not require computerization, and can provide statistically accurate three�dimensional information based on two�dimensional sampling with a minimum of effort. Although the examples are directed at diagnostic radiology, the estimation procedures may be employed in analogous fields such as microscopy or section anatomy.