Oblique photography of the ribs for the purpose of observation

Answer: E

Oblique rib photography mainly observes the bone condition of the rib curvature in the mid-axillary line. In the oblique position of the ribs, the curvature of the ribs can be brought close to the film. In the anterior and posterior oblique position, the back of the ribs is flattened, and the neck of the ribs is clearly displayed. In the posteroanterior oblique view, the joint between the front end of the rib and the costal cartilage avoids the heart, so the contrast is large and can be clearly displayed.