By A. Stewart Whitley, Charles Sloane, Graham Hoadley, Adrian D. Moore, Chrissie W. Alsop
First released in 1939, Clark's Positioning in Radiography is the definitive textual content on sufferer positioning for the diagnostic radiography pupil and practitioner. This totally revised twelfth version guarantees that the name keeps its pre-eminence within the box, with countless numbers of recent positioning pictures and fresh explanatory line diagrams, a essentially outlined and easy-to-follow constitution, and overseas applicability. The publication provides the necessities of radiographic recommendations in as functional a fashion as attainable, heading off pointless technical complexity and making sure that the coed and practitioner can locate speedy the data that they require concerning a specific place. The skilled writer workforce, improved for this version, needless to say there is not any alternative for an exceptional figuring out of simple abilities in sufferer positioning and a correct wisdom of anatomy to make sure solid radiographic perform. all of the general positioning is integrated during this unmarried quantity, followed by way of supplementary positions the place correct and illustrations of pathology the place applicable. universal blunders in positioning also are integrated.
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Extra resources for Clark's Positioning in Radiography, 12th edition (Hodder Arnold Publication)
All film cassettes should be maintained to ensure good film/screen contact, and other imaging equipment should be maintained regularly. The radiographic image 1 Image acquisition and display Images can be acquired in several different ways depending on the equipment used by any particular imaging department. These are: • • • conventional film/screen technology; fluoroscopy/fluorography; digital imaging: – computed radiography (CR); – direct digital radiography (DDR). Each of the above will be considered briefly.
The FFD must not be excessive, otherwise the large increase in mAs required would mean high tube loading. Most radiographic examinations are carried out with an FFD of 100 cm, which gives acceptable focus-to-skin distance and geometrical unsharpness but does not put unnecessary thermal stress on the X-ray tube. If this is the customary FFD used, then the department will require grids focused at 100 cm. 29 1 Exposure factors Focus-to-film distance (contd) If there is a large object-to-film distance, FFD is sometimes increased to reduce geometrical unsharpness and magnification.
When choosing the FFD, the following factors are taken into consideration: • • • The X-ray tube must not be too close to the patient’s skin, otherwise radiation damage could be caused. Short FFDs could give unacceptable geometric unsharpness. The FFD must not be excessive, otherwise the large increase in mAs required would mean high tube loading. Most radiographic examinations are carried out with an FFD of 100 cm, which gives acceptable focus-to-skin distance and geometrical unsharpness but does not put unnecessary thermal stress on the X-ray tube.