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Read Online or Download A Letter by Mar Jacob, Bishop of Edessa, on Syriac Orthography; also a Tract by the Same Author, and a Discourse by Gregory Bar Hebraeus on Syriac Accents PDF
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Extra info for A Letter by Mar Jacob, Bishop of Edessa, on Syriac Orthography; also a Tract by the Same Author, and a Discourse by Gregory Bar Hebraeus on Syriac Accents
Sample text
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.