Food oral processing and pharyngeal food passage cannot be observed directly from the outside of the body without instrumental methods. Videofluoroscopy (X-ray video recording) reveals the movement of oropharyngeal anatomical structures in two dimensions. By adding a radiopaque contrast medium, the motion and shape of the food bolus can be also visualized, providing critical information about the mechanisms of eating, drinking, and swallowing. For quantitative analysis of the kinematics of oral food processing, radiopaque markers are attached to the teeth, tongue or soft palate. This approach permits kinematic analysis with a variety of textures and consistencies, both solid and liquid. Fundamental mechanisms of food oral processing are clearly observed with videofluoroscopy (VFS) in lateral and anteroposterior projections.

如果没有仪器方法，无法从体外直接观察食物的口腔加工和咽部食物通过情况。视频荧光镜检查（X 射线视频记录）揭示口咽解剖结构的二维运动。通过添加不透射线的造影剂，食物团的运动和形状也可以可视化，提供有关饮食和吞咽机制的关键信息。为了定量分析口腔食品加工的运动学，将不透射线的标记贴在牙齿、舌头或软腭上。这种方法允许对各种纹理和稠度（固体和液体）进行运动学分析。通过视频透视 (VFS) 的横向和前后投影可以清楚地观察到食物口腔加工的基本机制。