Abstract

Positron emission tomography/magnetic resonance imaging (PET/MRI) plays a pivotal role in oncologic imaging. This hybrid imaging technique combines anatomical and functional information, providing significant advantages in the staging, restaging, and assessment of treatment response, as well as in the metabolic characterization of tumors. MRI sequences are utilized to enhance the anatomical accuracy of the functional images obtained through PET. This section focuses on the most commonly used fundamental MRI sequences in PET/MRI oncologic imaging. Specifically, T1-weighted, T2-weighted, diffusion-weighted imaging, and dynamic contrast-enhanced sequences are highlighted, as they allow for detailed examination of the morphological structures of tumors. These sequences can be tailored to different cancer types and clinical scenarios, thereby enhancing the accuracy and reliability of imaging outcomes. Furthermore, the proper integration of these sequences plays a critical role in optimizing patient management and is essential in the planning of treatment strategies.