Final answer:
A radiographic examination of the spinal canal after the introduction of a radiopaque substance is known as a myelogram. It involves injecting a contrast agent into the spinal canal and then taking X-rays or CT scans to visualize the spinal cord and nerve roots.
Step-by-step explanation:
The radiographic examination of the spinal canal after the introduction of a radiopaque substance is known as a myelogram.
In this imaging technique, a contrast agent is injected into the spinal canal, and then X-rays or CT scans are taken to visualize the spinal cord and nerve roots.
This procedure helps in diagnosing conditions such as herniated discs, spinal tumors, and spinal stenosis.