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Development of an MRI-compatible digital SiPM detector stack for simultaneous PET/MRI.

Peter M Düppenbecker1,2,3,4, Bjoern Weissler2,5, Pierre Gebhardt1

  • 1Imaging Sciences & Biomedical Engineering, King's College London, UK.

Biomedical Physics & Engineering Express
|May 2, 2017
PubMed
Summary

Researchers developed an MRI-compatible positron emission tomography (PET) detector using digital SiPMs. This novel design enables simultaneous PET/MRI imaging with minimal performance degradation from MRI fields.

Keywords:
MRI compatibilityPET/MRIdigital SiPMelectromagnetic interferencetime-of-flight

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Area of Science:

  • Medical Imaging
  • Instrumentation
  • Physics

Background:

  • Hybrid imaging systems combining PET and MRI offer advanced diagnostic capabilities.
  • Solid-state photon detectors are crucial for developing integrated PET/MRI systems.
  • Digital Silicon Photomultiplier (SiPM) technology enables new possibilities for PET detector design.

Purpose of the Study:

  • To develop and evaluate an MRI-compatible PET detector stack for simultaneous PET/MRI systems.
  • To assess the performance and MRI compatibility of a novel digital SiPM-based PET detector.
  • To optimize the detector design to mitigate distortions caused by MRI environments.

Main Methods:

  • Developed an 8x8 array digital SiPM PET detector stack using Philips DPC 3200-22 devices.
  • Integrated an FPGA for data acquisition, voltage control, and cooling infrastructure.
  • Tested MRI compatibility on a laboratory bench and a 3 T Philips Achieva MRI system, optimizing design based on observed effects.

Main Results:

  • The developed PET detector stack operates successfully within an MRI system, a first for digital SiPMs.
  • The design minimizes static magnetic field distortions compared to conventional designs.
  • Initial gradient switching caused minor energy/timing degradations, resolved through design improvements, with no impact on SiPM performance.

Conclusions:

  • The novel digital SiPM PET detector is compatible with simultaneous MRI operation.
  • Design modifications effectively eliminated performance degradations from MRI gradient switching.
  • This detector serves as a building block for next-generation simultaneous PET/MRI systems.