MR-compatible brain PET system consisting of PET detectors, analog and digital electronics.
The 4 × 4 matrix LYSO crystals and 4 × 4 array GAPD used to construct the PET detector module.
PET detector module and preamplifiers board connected using a flexible flat cable (FFC) of 300 cm long (a) and photograph of the fabricated position decoder circuit board (b).
Schematic drawing of the signals, ground, and bias voltages lines in a FFC.
Illustration of PET/MRI integration showing the placement of the PET gantry, RF coil, and shielding box.
Frontal (a) and rear (b) view of the PET gantry with the RF coil placed inside 3-T MRI.
Energy spectra from 64 channels of a PET detector block. Gaussian function fitted line to the spectra are shown.
Count rate changes of the PET system during image acquisition time: (a) operated inside and outside MRI and (b) operated inside MRI with MR SE or GE sequence.
PET (a), MRI (b), and fused images (c) of a hot-rod phantom acquired with the GE (top) and SE (bottom) sequences.
PET (a) and fused images (c) of a 3D Hoffman brain phantom simultaneously acquired with SE sequence (b).
PET images of a 3D Hoffman brain phantom acquired with the PET system operated inside the MRI system during a simultaneous MR SE sequence (a) and acquired outside the MRI (b). MR images of a 3D Hoffman brain phantom taken with the PET insert acquiring PET data (d) and in comparison with MR images of the 3D Hoffman brain phantom acquired without the PET insert (e). The MR images were acquired with the SE sequence. The profiles are drawn through the PET images (c) and MR images (f). The profile (f) of the MR image (d) acquired with the PET system inside the MRI showed a lower signal towards the edges of the FOV. Note that SNR of the MR image (d) was improved after the RF coil retuning with the PET system. A little distortion on the top of the MR image (d) was caused by an air bubble inside the phantom.
Design parameters of the MR-compatible brain PET.
Specification of the 4 × 4 array GAPD used for PET detector module.
Effect of MR sequences on PET insert.
Effect of PET insert on MR phantom images.
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