Which of the following is NOT an advantage of angiography over duplex carotid studies?

Angiography offers several advantages over duplex carotid studies, such as providing detailed visualization of arterial anatomy, allowing for the assessment of vascular abnormalities, and offering precise measurements of blood flow direction. These qualities make angiography a valuable diagnostic tool in evaluating the vascular system.

However, when it comes to repeatability, angiography is not as flexible as duplex carotid studies. Angiography often involves the use of contrast agents and radiation, which can limit how often the procedure can be safely repeated. In contrast, duplex carotid studies are non-invasive, do not use ionizing radiation, and can be performed more frequently without the associated risks. Therefore, the statement about unlimited repeatability not being an advantage of angiography is accurate, highlighting a significant distinction between these two diagnostic techniques.