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Directional Terms
While taking an X-ray image, a patient or a part of the patient’s body may be positioned differently with reference to the source and the film.
X-ray images are qualified by directional terms based on the direction of the X-ray beam.
If :
§The beam enters the front of the patient’s body and emerges from the back –
that is,
§The patient faces the source and the film is behind the patient …
The image is described as an anteroposterior (A-P) view.
An image taken in the reverse manner (X-rays going from the back to the front, the film in front) is a PA view. Most chest X-ray images are taken as PA views.
Images can also show lateral views (R to L or L to R) and even oblique views which have special terms depending on whether the beam comes from the right or left side as also anterior or posterior. Some regions require special views. We need not worry about these details. A basic understanding of AP, PA and Lateral views is adequate.
Key Point : The “view” of an X-ray image tells us the direction of the X-ray beam through the body in directional terms.