Clinical Radiographic Units

This chapter introduces the clinical radiographic units that the reader might find in the hospital. The radiographic image quality of obese patients is mainly compromised by an inadequate signal to noise ratio, due to additional radiation scatter caused by the thicker layer of adipose tissue”. Direct digital radiography can be grouped into three specific technologies: charge coupled devices (CCD) using crystalline silicon technology and large area flat panel detectors, including both amorphous selenium and amorphous silicon technology. CCDs are light sensitive integrated circuit devices made of very pure crystalline silicon and electronic gates, which can be used for X-ray applications as an image detector. The X-ray table is used for patients lying in the supine and prone positions, as well as for sitting the patient at the table side. In X-ray tables and X-ray stands the moving anti-scatter grid is activated when the exposure button is prepared on the X-ray tube.