Advances in PET by Unknown

Author:Unknown
Language: eng
Format: epub
ISBN: 9783030430405
Publisher: Springer International Publishing

4.2.5 Summary

In summary, the SiPM-based block detector and fast-decay scintillation crystals can deliver improved PET imaging performance, through its TOF capabilities, stable detector gain through temperature control, and the improved NECR performance. Its modularity allows easy customization of axial FOVs, while it can be integrated into both PET/CT and PET/MR scanners to reduce development costs for the PET system manufacturers.

4.3 SiPM-Based Block Detector Architecture

In the SiPM block detector used in the GE Discovery MI PET/CT and SIGNA PET/MR systems, a 4 × 9 element LYSO crystal array is multiplexed to three arrays of Hamamatsu SiPMs, each with 3 × 2 pixels. Each crystal element is 3.95 mm (transaxial) by 5.3 mm (axial) by 25 mm (length), while each SiPM pixel is 2 × 2 mm in size. This detector architecture utilizes scintillation crystals coupled to a tapered light guide in order to achieve light-sharing multiplexing in their block detectors. By using light-sharing multiplexing, the number of photodetectors and readout channels needed for the readout of the block is reduced. Figure 4.1 shows an illustration of the different components of GE’s SiPM-based block detector.

Fig. 4.1A new-generation PET detector module. Each block detector is composed of 4 × 9 LYSO crystals arranged in an array, each of which is 3.95 mm × 5.3 mm × 25 mm, coupled to 3 SiPM Hamamatsu arrays through a tapered light guide. Each SiPM array has 3 × 2 pixels, and each pixel is 2 mm × 2 mm

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