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This review article aims to give an overview of the current state of spectral CT and to explore opportunities for applications in RT.<\/jats:p>\n                  <jats:p>In this article, three groups of benefits of spectral CT over conventional CT in RT are recognized. Firstly, spectral CT provides more information of physical properties of the body, which can improve dose calculation. Furthermore, it improves the visibility of tumors, for a wide variety of malignancies as well as organs\u2010at\u2010risk OARs, which could reduce treatment uncertainty. 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