![]() ![]() the lateral view of the chest is performed erect left lateral and labeled with the side closest to the cassette.the supine position results in physiological widening of the cardiomediastinal outline including superior mediastinum, as well as congestion of the pulmonary veins with upper lobe venous diversion.a AP supine view is a further alternative frontal projection technique often used in trauma patients, or patients who can't sit up.disadvantages: mediastinal structures may appear magnified as the heart is further away from the detector, often poorly inspired, more likely to be rotated and to create skin folds, scapulae often cover some of the lungs.advantages: more convenient for intubated and sick patients who will not be able to stand for a PA projection.it can be performed with the patient sitting up on the bed and even performed outside the radiology department using a mobile x-ray unit.the anteroposterior (AP) erect view is an alternative frontal projection to the PA projection with the beam traversing the patient from anterior to posterior.disadvantages: patient must be able to stand erect. ![]() advantages: technically excellent visualization of the mediastinum and lungs, with accurate assessment of heart size.it is the best general radiographic technique to examine the lungs, bony thoracic cavity, mediastinum and great vessels.it is performed standing and in full inspiration with the patient hugging the detector to pull the scapulae laterally.the x-ray beam traverses the patient from posterior to anterior.the posteroanterior (PA) view is the standard frontal chest projection. ![]()
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