Respuesta :
A PA projection of the hand demonstrates an AP projection of the first finger.
Anterior-Posterior (AP) projection is used because X-rays go from the patient's anterior to posterior.
When the patient is too ill to endure standing or leaving the bed, the upright anteroposterior chest view offers an alternative to the PA view. The lungs, mediastinum, bony thoracic cavity, and major vessels are all examined from the AP view.
The AP projection is preferable to the PA projection for the thumb. When the hand is pronated, the fingers are in the PA position, but the thumb is oblique. The complete first metacarpal of the thumb must be examined, but only a piece of each of the fingers' respective metacarpals must be examined.
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