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[Research and development for next generation PET instrumentations].

Taiga Yamaya1

  • 1Molecular Imaging Center National Institute of Radiological Sciences, lnage-ku, Chiba 263-8555, Japan.

Igaku Butsuri : Nihon Igaku Butsuri Gakkai Kikanshi = Japanese Journal of Medical Physics : an Official Journal of Japan Society of Medical Physics
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Summary

Next-generation positron emission tomography (PET) scanners aim to improve sensitivity and resolution. Research focuses on depth-of-interaction (DOI) detectors, like those using silicon photomultipliers (SiPMs), to enhance cancer imaging and research.

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Area of Science:

  • Medical Imaging
  • Nuclear Physics
  • Radiological Sciences

Background:

  • Positron emission tomography (PET) is crucial for cancer diagnosis and molecular imaging.
  • Current PET scanners have limitations in sensitivity (under 10%), resolution, and cost.
  • Significant advancements are needed to improve the utilization of emitted gamma-rays.

Purpose of the Study:

  • To introduce research trends in PET physics at the National Institute of Radiological Sciences (NIRS).
  • To highlight the role of depth-of-interaction (DOI) detectors in advancing PET technology.
  • To present the development of novel PET systems and detectors for improved imaging.

Main Methods:

  • Investigating depth-of-interaction (DOI) detector technologies for enhanced sensitivity and spatial resolution.
  • Developing an open-type PET geometry (OpenPET) for flexible detector arrangements and in-treatment imaging.
  • Utilizing silicon photomultipliers (SiPMs) in DOI detectors to approach sub-millimeter spatial resolution.

Main Results:

  • DOI detectors are identified as key to improving PET sensitivity while maintaining high spatial resolution.
  • The development of an open-type PET geometry (OpenPET) is underway, enabling new imaging applications.
  • SiPM-based DOI detectors are being engineered to achieve near-theoretical spatial resolution limits.

Conclusions:

  • Advancements in DOI detector technology, particularly with SiPMs, are critical for next-generation PET scanners.
  • Novel PET geometries like OpenPET offer expanded applications, including imaging during treatment.
  • Future PET imaging will benefit from improved sensitivity, resolution, and flexibility, driven by detector innovations.