When and why

(CT) is a widely used imaging technology which assists in the diagnosis and treatment of many conditions. It is also known as computerised axial tomography (CAT) and computerised transaxial tomography (CTAT).

In the context of HIV, it can be helpful in the diagnosis of cancers and infections in the head, chest, gut and lymph nodes, and is especially useful for visualising space-occupying lesions. A CT scan may be conducted to assess lipodystrophy, although the DEXA scan is generally favoured in this regard.

The technology assesses the tissue density of narrow slices (1-10 mm) of your body, spaced at intervals of 5-10 mm. From these slices, a full CT image is generated which can show subtle changes in tissue type, lesions, and evidence of infections.

During the scan, you lie on a table while the scanner passes over your body. You do not feel anything while undergoing a CT scan.

How it will help

Accurate diagnosis of opportunistic infections and malignancies will facilitate appropriate treatment.