ABSTRACT
Maxillofacial imaging has evolved with the development of newer imaging technologies. Conventional plain radiography and dental imaging is now commonly supplemented by cross-sectional modalities such as computed tomography, magnetic resonance imaging and ultrasound, together with functional imaging with positron emission tomography. The x-rays are produced by a point source and, after passing through the body part of interest, are detected by non-screen or intensifying screen/film combinations. Tomography refers to a technique whereby the x-ray source and film move during the exposure providing a ‘section’ that is in focus and blurring of structures outside the area of interest. Contrast media may be introduced into a vessel, lumen or cavity to render it radio-opaque and allow radiological visualisation in ‘real time’ with fluoroscopic imaging or with serial radiographs. Lymphomatous lymph nodes characteristically appear rounded, often retaining a central echo-genic hilus, and possess a homogenous, hypo-echoic cortex.
