CAMRT Radiography Practice Exam

Which of the following imaging exams involves the highest radiation dose?

1. Chest

2. KUB

3. Lumbar spine

4. Barium Enema

The correct answer is: Barium Enema

The barium enema involves the highest radiation dose among the options listed due to the nature of the procedure and the imaging techniques used. During a barium enema, radio-opaque contrast material (barium sulfate) is introduced into the colon. This practice allows for detailed imaging of the large intestine to identify abnormalities such as tumors, polyps, or other gastrointestinal issues. The procedure typically combines fluoroscopy with a series of radiographs to obtain a comprehensive view of the colon. Fluoroscopy, which is a continuous X-ray procedure, usually results in higher radiation exposure compared to traditional static imaging such as chest X-rays or KUB (Kidneys, Ureters, Bladder) radiography. In particular, fluoroscopic imaging can significantly increase the cumulative radiation dose received by the patient due to the extended time necessary to monitor the barium’s movement through the gastrointestinal tract. In contrast, the chest and KUB examinations generally require a lower radiation dose since they primarily involve standard single-image radiography, which uses a shorter exposure time and less complex imaging processes. The lumbar spine series, while also associated with radiation exposure, typically involves fewer films than a barium enema and additional safety measures are often in place to limit dosages. Thus,