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SUPINE
The transthoracie latcral projection may be performed with the patient positioned upright or
SURGICAL NECK
To what specific area of the humerus should the IR be centered for the transthoracic lateral projection (Lawrence method)?
10 to 15 degroes cophalad
How many degrees and is which direction sould the central ray be directed if it cannot be directed perpendicular to the IR because the patient is unable to elevate the unaffected shoulder?
Use a low mA/long exposure time combination with the usual mAs factor.
Which change to radiographic exposure factors should be used to aid effectively the bluming of lung detail by the action of the heart when the patient is able to hold his or her breath for a sustained period?