ABSTRACT
Radiogrammetry is a comparatively simple bone assessment technique involving the comparative measurement of cortical bone thickness and medullary cavity width. This chapter provides an overview of the approach and technical application of the technique. In the most common applications, radiogrammetry measurements are taken from reproducibly-acquired plane radiographic images of long bones. The Pronosco X-posure system provides a good example of how a single measure can be improved by extending it to multiple regions of interest. Ultimately, as with all measurements taken from diagnostic images, there are three main limiting factors in radiogrammetry—precision, accuracy and validity. Radiogrammetry relies on the accurate and precise measurement of the distances between two edges. Image sharpness, the capability of an image modality to define such edges, is therefore of fundamental importance to good radiogrammetric measurement. Radiogrammetry is the comparative measurement of cortical bone thickness as a means of identifying pathology or providing quantitative information on bone structure.
