Photography pose PA= back and front position, AP= front and back position. What do you mean by LL, RL, RLD, LLD, RLO and LLO? Please explain to God, thank you.

RLO is in the right front position, LLO is in the left front position, and the signs show rap, RPO and Lao. LPO。

LLD left side lying position, RLD right side lying position, mark shows DEC.

the left side

R: ok

Left: horizontal

O: inclined

D: bedsore

Extended data

The reason why X-rays can make human tissues form images on the screen or film is based on the penetrability, fluorescence effect and photosensitive effect of X-rays. On the other hand, it is based on the difference in density and thickness between human tissues.

When X-rays pass through different tissues and structures of human body, the absorption degree is different, so the amount of X-rays reaching the screen or film is also different. In this way, images with different light and dark or black and white contrast are formed on the screen or X-ray film.

The formation of X-ray images is based on the following three basic conditions:

First of all, X-rays have a certain penetrating power, which can penetrate human tissues and structures. Secondly, there are differences in density and thickness of the penetrated tissue structure, and the amount of X-rays absorbed during penetration is different, so the amount of remaining X-rays is also different; Third, this differential residual X-ray is invisible. After the imaging process, X-ray images with black-and-white contrast and hierarchical differences can be obtained.

Reference source Baidu Encyclopedia-Radiography