What do you mean by back and forth in X-ray photos? For example, does the back front position mean that X-rays hit the chest and abdomen from behind?

I am a senior radiologist and can answer your questions. The front and back of X-ray photos refer to the front and back of anatomical posture, that is, the face is in front and the pillow is behind. The front position and the back position refer to the incident and emergent positions of light. For example, the posterior position means that the radiation enters the body from the rear, exits the body from the front, and then enters the X-ray box, IP board or other image collectors. Commonly used, such as the posterior and anterior position of the chest, injected from the back and ejected from the chest. Others, such as the anteroposterior position of the hand, are injected from the palm of the hand and ejected from the back of the hand; The front and back position of the hand is taken from the back of the hand and from the palm of the hand. Other parts and so on.

Oh, yes, I have the wrong number. Please change it.

"If the chest radiograph is often in the front and back position, do we see the film from back to front or from back to front?" -Chest in front and back position. When watching the film, you need to turn the film left and right, that is, from the anatomical posture to the back. When taking pictures, there is always type, in which the word "right" represents the right side of anatomy and is placed on the left hand side of the viewer's body. Before and after the chest radiograph, or from front to back.

"For example, why can't you see the influence of the spine behind and in front of the chest?" -The spine can be seen, especially the upper thoracic vertebra. The lower thoracic vertebra can't be clearly or completely displayed due to the overlapping of mediastinum and cardiac shadow, which is related to the photo factors, and is not caused by anteroposterior or posteroanterior position.