By A. Stewart Whitley

First released in 1939, this is often the definitive textual content on sufferer positioning for the diagnostic radiography scholar and practitioner. The skilled writer crew appreciates that there's no alternative for an outstanding realizing of easy talents in sufferer positioning and a correct wisdom of anatomy to make sure stable radiographic perform.

This twelfth variation keeps the book’s pre-eminence within the box, with hundreds of thousands of positioning pictures and explanatory line diagrams, a in actual fact outlined and easy-to-follow constitution, and overseas applicability.

The ebook provides the necessities of radiographic innovations in a realistic method, warding off pointless technical complexity and making sure that the coed and practitioner can locate quick the knowledge that they require relating to specific positions. the entire regular positioning is integrated, followed by means of supplementary positions the place suitable and illustrations of pathology the place acceptable. universal blunders in positioning also are discussed.

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Example text

If insufficient mA is used, then a photographic film will be underexposed and will lack photographic density and therefore will show reduced contrast. If an electronic image-acquisition device is used, then an insufficient mAs will manifest itself as noise or mottle, even though the image-processing software will have produced a computer screen brightness (image) density that appears adequate. A mAs level that is too high will result in an overexposed film with excessive density and, again, a lack of contrast.

These include the exposure of children, high-dose examinations, exposure of women who may be pregnant, and exposure for medical research or medicolegal purposes. Employers must ensure that the duty holders are adequately trained to perform their duties and to meet their responsibilities to protect patients. For example, an operator carrying out a medical exposure needs to know how to optimize all aspects of that exposure in order to obtain the necessary information with the lowest practicable dose.

The resulting difference in density between the two images will be reduced, giving a lower-contrast image. g. the chest), then the image may show excessive contrast and it might be necessary to reduce the contrast within the image to allow a diagnostic image density to be attained throughout the region of interest. This can be achieved by increasing the kVp and, as mentioned previously, is commonly undertaken in chest radiography. Another reason for increasing the kVp is to allow the mAs, and therefore the exposure time, to be reduced.

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