Dual energy x-ray absorptiometry (DXA) is a medical imaging technique commonly used to measure bone density. However, there are a few synonyms for DXA that are often used interchangeably. One of them is bone densitometry, which refers to the same type of medical imaging but with a broader scope that also includes other methods that can measure bone density. Another synonym is dual photon absorptiometry (DPA), which is a similar technique that uses a different type of radiation source. Lastly, quantitative computed tomography (QCT) is also used to measure bone density and is similar to DXA, but uses different imaging methods. These synonyms are often used interchangeably in medical literature and discussions, although the specific method used may differ slightly.