CAMRT Radiography Practice Exam

On a decubitus x-ray, what side is the area of interest?

1. Upright side

2. Dependent side

3. Left side

4. Right side

The correct answer is: Dependent side

In a decubitus x-ray, the area of interest is indeed located on the dependent side. This positioning is critical because a decubitus view is generally used to visualize fluid levels or air-fluid levels in the thorax or abdomen. When a patient is positioned lying down, the side that is in contact with the x-ray plate is referred to as the dependent side, while the opposite side is the upright side. For instance, if a patient is lying on their left side, the right side becomes the area of interest. This is particularly important when evaluating conditions such as pleural effusions or pneumothorax. The fluid tends to collect in the most dependent area due to gravity, making it essential to indicate and assess the dependent side during interpretation. The other options do not apply in this context since they refer to positions that do not relate to the concept of dependency in a lateral position. Understanding this concept is fundamental in radiography for accurate diagnosis and treatment planning.