A feasibility study of a PET/MRI insert detector using strip-line and waveform sampling data acquisition
2015
Abstract We are developing a time-of-flight Positron Emission Tomography (PET) detector by using silicon photo-multipliers (SiPM) on a
strip-line and high speed waveform sampling data acquisition. In this design, multiple SiPMs are connected on a single
strip-line and signal waveforms on the
strip-line are sampled at two ends of the
stripto reduce readout channels while fully exploiting the fast time response of SiPMs. In addition to the deposited energy and time information, the position of the hit SiPM along the
strip-line is determined by the arrival time difference of the waveform. Due to the insensitivity of the SiPMs to magnetic fields and the compact front-end electronics, the detector approach is highly attractive for developing a PET insert system for a magnetic resonance imaging (MRI) scanner to provide simultaneous PET/MR imaging. To investigate the feasibility, experimental tests using prototype detector modules have been conducted inside a 9.4 T small animal MRI scanner (Bruker BioSpec 94/30
imaging spectrometer). On the prototype
strip-line board, 16 SiPMs (5.2 mm pitch) are installed on two
strip-lines and coupled to 2×8
LYSOscintillators (5.0×5.0×10.0 mm 3 with 5.2 mm pitch). The outputs of the
strip-line boards are connected to a Domino-Ring-Sampler (DRS4) evaluation board for waveform sampling. Preliminary experimental results show that the effect of interference on the MRI image due to the PET detector is negligible and that PET detector performance is comparable with the results measured outside the MRI scanner.
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