To determine the cause of the patient's severe back pain,the doctor ordered a diagnostic test to record images of the spinal cord after an injection of a contrast agent into the subarachnoid space.This process is called

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CT myelography involves injecting a contrast agent into the subarachnoid space to visualize the spinal cord and surrounding structures. Positron emission tomography and magnetic resonance imaging do not involve the injection of contrast agents into the subarachnoid space, while evoked potential studies are used to assess nerve function, not to visualize the spinal cord.

To Determine the Cause of the Patient's Severe Back Pain,the