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Abstract #4108

Free-Breathing Radial 3D Fat-Suppressed T1-Weighted Gradient Echo Sequence for Pulmonary Nodule Detection in Patients Undergoing PET/CT Followed by Simultaneous PET/MR Examination

Hersh Chandarana1, Laura Heacock1, Rajan Rakheja1, Linda DeMello1, John Bonavita1, Kai Tobias Block1, Christian Geppert2, Kent Friedman1

1Radiology, NYU Langone Medical Center, New York, NY, United States; 2Siemens Medical Systems, New York, NY, United States

Recently introduced integrated whole-body PET/MR systems may play an important role in oncologic evaluation. However, there are concerns regarding ability of MRI in detecting pulmonary nodules. 32 consecutive patients undergoing clinically indicated 18F-FDG-PET/CT immediately followed by PET/MR (Siemens Biograph mMR) were studied. MR imaging was performed simultaneously with PET acquisition using a free-breathing radial 3D fat-suppressed T1-weighted gradient echo sequence (Radial VIBE-RV). RV detected all FDG avid nodules greater than 0.7 cm in size but had lower sensitivity for small nodules and non-FDG avid nodules. This has important implications for oncologic imaging with PET/MR.