What is 17 × 17 vertical manual orthograph rays equipment stand

What is 17 × 17 vertical manual orthograph rays equipment stand?
Rays equipment stand is used in various medical X-ray machines to photograph the head, chest, abdomen, pelvic cavity and other parts of the human body. It is composed of four parts: column, slide frame bucky tray, balance device. The filter grille is optional. 17 × 17 vertical manual front piece rays equipment stand means that the dimension of tray is 17 × 17, and the chest frame is vertical fixed bucky tray. The lifting mode is manual control. The whole plane height is about 2 meters, and can be configured in different x-ray machine.