需要润色吗：Digital Subtraction Angiography DSA is the gold standard for diagnosing carotid artery disease However as an invasive examination DSA involves radiation and is relatively expensive Moreover it c

需要润色。可以将句子重新组织以提高流畅性和表达准确性：

Digital Subtraction Angiography (DSA) is considered the gold standard for diagnosing carotid artery disease. However, due to its invasive nature, DSA involves radiation exposure and is relatively costly. Additionally, it has limitations in displaying neovascularization within plaques and small ulcers.