Fig. 6

MRI SNR in the presence of the PET insert. a A 15 mL conical tube filled with a 20 mM CuSO₄ solution was placed inside the MRI with the 35 mm Bruker MR coil and scanned with a MSME MRI acquisition without the PET insert (black), with the PET insert in the magnet and turned off (red), and with the PET insert in the magnet and turned on (blue). MR SNR and linearity were maintained throughout the axial FOV of the coil in all scenarios. b The PET insert did not affect SNR for MRI acquisition methods that are not gradient-intensive (MSME, RARE, FLASH, MGE). However, SNR decreased by 33% with gradient-intensive MRI acquisition methods (True-FISP, FID-FISP, EPI, uTE) when using the PET insert. c The same study was performed with the 35 mm PulseTeq MR coil. d The PET insert did not affect SNR for MRI acquisition methods that are not gradient-intensive (MSME, RARE, FLASH, MGE). However, SNR decreased by 25% with gradient-intensive MRI acquisition methods (True-FISP, FID-FISP, EPI, uTE) when using the PET insert. This loss of SNR was slightly more exaggerated with the insert turned on versus off when using the PulseTeq MR coil, but the opposite was true for the Bruker 35 mm MR coil