American Registry of Radiologic Technologists (ARRT) Practice Exam

What type of radiographic procedure requires an injection into the spinal canal?

1. CT Scan

2. Myelogram

3. MRI

4. X-ray

The correct answer is: Myelogram

A myelogram is a specific radiographic procedure that involves the injection of a contrast dye into the spinal canal to visualize the spinal cord and nerve roots using imaging techniques such as X-ray or CT. This procedure allows for enhanced visualization of potential issues such as herniated discs, spinal stenosis, or tumors that may not be as clearly defined through standard X-rays alone. The introduction of the contrast material helps to delineate the structures within the spinal canal, providing crucial diagnostic information for health professionals. In contrast, a CT scan, MRI, or standard X-ray do not involve an injection into the spinal canal. A CT scan typically utilizes X-ray technology to produce cross-sectional images but does not require any contrast dye injections directly into the spine. An MRI employs strong magnetic fields and radio waves to generate detailed images of organs and tissues but also does not necessitate direct injection into the spinal canal, although in some cases, contrast agents may be used but not injected into the canal itself like in a myelogram. Regular X-rays capture images of the body but rely solely on the body's natural structure without the use of contrast media or injections.