What is an advantage of using CT for attenuation correction?

Using CT for attenuation correction in PET imaging offers the significant advantage of providing fused images that aid in anatomical localization. The process of attenuation correction is essential in PET imaging to account for the varying degrees of absorption of emitted positrons by different tissues in the body.

By incorporating data from a CT scan, which has excellent spatial resolution and detailed anatomical information, the resulting fused images allow for better alignment of the functional data from PET with the anatomical structures shown on the CT. This fusion enhances the interpretability of the PET images by helping clinicians locate tumors or other anomalies more precisely within the context of surrounding tissues.

In contrast, the other options reflect disadvantages rather than advantages of using CT for attenuation correction. For example, the use of CT can lead to higher radiation dosages compared to other imaging techniques due to the additional exposure required for the CT scan. As such, the benefit of achieving better anatomical localization through fused images plays a crucial role in improving diagnostic accuracy and treatment planning in clinical practice.