What are the meanings of PA and AP in medical images?

PA and AP in medical images represent posterior anterior position and anterior and posterior position.

In medical images, such as chest radiographs:

AP is the abbreviation of anterior and posterior position, which refers to the anterior and posterior position of chest radiograph. Lateral chest radiograph is lateral, pa is facing the plate, and back to the bulb; The back plate of the ap faces the light bulb. Most chest radiographs are anterior and posterior images, that is, the patient faces the cassette, and the X-ray beam enters from the patient's back, passes through the chest cavity and exits from the anterior chest wall and reaches the film. The front chest radiograph and the back chest radiograph are the opposite directions of the patient facing the cassette.

Note: Medical imaging is a technique and processing process to obtain the internal tissue image of human body or a certain part of human body in a non-invasive way for medical treatment or medical research. It includes the following two relatively independent research directions: medical imaging system and medical image processing.

Extended data:

Application of medical imaging technology;

As a science, medical imaging belongs to biological imaging, including image diagnosis, radiology, endoscope, medical thermal imaging technology, medical photography and microscope. In addition, although technologies including EEG and brain magnetic resonance imaging focus on measurement and recording, and there is no image display, the generated data can be regarded as another form of medical images because of its positioning characteristics.

In clinical application, medical imaging is applied to medical imaging. Some hospitals will set up imaging medical centers, imaging medical departments or imaging medical departments, and be equipped with relevant instruments and equipment. There are specialized nurses, radiologists and doctors who are responsible for the operation, image interpretation and diagnosis of instruments and equipment, which is different from radiotherapy in radiology.

In medicine, medical engineering, medical physics and biomedical informatics, medical imaging usually refers to the science of studying the composition of images, the technology of capturing and storing, and the research and development of instruments and equipment. The research on how to interpret, interpret and diagnose medical images belongs to radiation medicine or other auxiliary sciences in the medical field.

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