CAMRT Radiography Practice Exam

Which radiographic position is most effective for demonstrating perforation of the intestines?

1. Sitting position

2. Supine position

3. Upright or decubitus position

4. Prone position

The correct answer is: Upright or decubitus position

The upright or decubitus position is considered the most effective for demonstrating perforation of the intestines because it allows for the best visualization of free air in the abdominal cavity, which is a key indicator of perforation. When a perforation occurs, air escapes from the intestines and can accumulate under the diaphragm. By positioning the patient upright or in a lateral decubitus position, radiologists can take advantage of gravity to allow the free air to rise, making it more conspicuous on the radiograph. In the upright position, air will rise to the highest point in the abdomen, which is typically under the diaphragm, thus providing a clear image that can help identify the presence of free air as an indication of perforation. In the decubitus position, the same principle applies; air will move to one side, which can be captured on the image. Other positions, such as sitting, supine, or prone, may not adequately demonstrate free air. The supine position could allow some air to escape but does not effectively show it in relation to the diaphragm, which is critical for diagnosing perforations. The prone position is not beneficial for this purpose, as it may obscure free air, making it more difficult to assess the condition of