What is the diagnostic procedure that combines CT and radioisotope scanning to highlight metabolic brain activity?

The diagnostic procedure that effectively combines computed tomography (CT) imaging with radioisotope scanning is known as positron emission tomography (PET) scan. This technique enables the visualization of metabolic processes in the brain by detecting gamma rays emitted from a radioactive substance that is injected into the body. The radioisotope, often a glucose analog, allows for the assessment of metabolic activity, making it particularly useful in identifying areas of abnormal brain function, such as tumor activity or regions affected by neurodegenerative diseases.

PET scans are especially valuable because they provide functional imaging, while CT offers structural images. The integration of these two modalities allows clinicians to correlate areas of high metabolic activity with specific anatomical structures, enhancing both diagnostic accuracy and treatment planning.

In contrast, MRI scans focus on high-resolution images of brain anatomy without the metabolic function assessment provided by PET. CT scans primarily deliver anatomical details but lack the specific metabolic insights gained from radioisotope application. X-rays provide even more limited information, focusing mainly on bony structures rather than soft tissue or metabolic function. Hence, the choice of a PET scan is essential for assessing metabolic brain activity effectively.