Читать книгу Fractures in the Horse - Группа авторов - Страница 126

CT is a high‐resolution, X‐ray based, quantitative, cross‐sectional imaging technique. It has for some time been integral to fracture diagnosis and management in man, and application in horses has recently evolved rapidly. Like radiography, it measures tissue attenuation of penetrating photons; however, the X‐ray source rotates around the patient. Multidetector row CT affords excellent spatial resolution and thin and overlapping slices, which approach isotropic, allow for multi‐planar reformatted (MPR) images that can be reconstructed in any chosen plane. The MPR reconstruction and thin slices both optimize fracture identification. Articular surfaces can be assessed [117, 118], and the superior bone detail produced by CT enhances identification and mapping of fissures, subchondral bone fractures, unicortical fractures and other articular fractures. Three‐dimensional surface rendering details the topographical aspects of the fracture configuration and with segmentation permits selective removal of overlying tissues in order to visualize the complexity of a fracture.

Cone beam CT (CB‐CT) has recently been introduced to equine use. It requires markedly different image reconstruction, does not provide quantitative information about tissue density and hosts a new complement of imaging artefacts that can detract from diagnostic accuracy.