T Dufresne | PubMed Health

PubMed1998

Segmentation techniques for analysis of bone by three-dimensional computed tomographic imaging.

Improved methods for evaluation and quantification of the three-dimensional (3D) architecture of bone are needed in order to more fully understand the role of trabecular architecture in bone strength. Computed tomography (microCT) is capable of examining bone at resolutions below 30 microm (isotropic), with collection of a three-dimensional data set which can then be subjected to image analysis. In this paper, we discuss automated methods for important steps in this analysis, including methods for (1) segmenting the image into bone and background; (2) defining the volume of interest for determination of structural parameters; and (3) segmenting the bone into trabecular and cortical components. Evaluation of bone structure using these techniques provides new information about the 3D architecture of bone tissue, and may be useful for evaluation of structural changes in bone caused by aging, disease, or drug treatment.

Algorithms↗

PubMed1995

Jones on ice: psychoanalysis and figure skating.

This paper rescues Ernest Jones's largely-unknown book, 'The Elements of Figure Skating' (1931/1952), from relative obscurity and argues for its place in the psychoanalytic literature. In the first section, the authors situate Jones's passion for figure skating by turning to various historical and biographical sources, and to personal correspondence with Jones's son, Mervyn Jones. In the second section, they offer the first textual reading of Jones and skating within a psychoanalytic framework. This approach, they argue, is long overdue since Jones explicitly claimed that the 'Elements' was motivated by his interest in the 'psychological' problems of the beginning skater, and with the task of instruction therein. The authors rely heavily on passages from the 'Elements', in part because the book is out-of-print and unavailable to most readers, but also because Jones's own words are an exemplary instance of his intense transference to psychoanalytic theory during his extra-professional time as a skater. They conclude the paper by arguing that Jones ultimately advocates a position beyond psychology when he idealistically embraces 'exact knowledge' as the royal road to masterful skating.

Humans↗