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Design Consideration01:22

Design Consideration

188
Designing a structure involves a series of considerations, primarily the material's ultimate strength, calculated through tests that measure changes under increased force until the material reaches its breaking point or limit. The ultimate load, where the material breaks, is divided by its original cross-sectional area, resulting in the ultimate normal stress or strength. The ultimate shearing stress is another significant factor taken into account.
The factor of safety is another key...
188

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SAFIR-I: first NEMA NU 4-2008-based performance characterization.

Pascal Bebié1, Werner Lustermann2, Jan Debus2

  • 1Institute for Particle Physics and Astrophysics, ETH Zurich, Otto-Stern-Weg 5, 8093, Zurich, ZH, Switzerland. bebiep@phys.ethz.ch.

EJNMMI Physics
|December 12, 2023
PubMed
Summary

The Small Animal Fast Insert for MRI detector I (SAFIR-I) PET insert achieves excellent performance for simultaneous small animal imaging. It enables rapid, quantitative imaging at high injected activities, crucial for studying fast tracer kinetics.

Keywords:
NEMA NU 4-2008PET/MRIPerformance characterizationPositron Emission TomographyPreclinical imagingSAFIR

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Area of Science:

  • Medical Imaging
  • Nuclear Medicine
  • Biomedical Engineering

Background:

  • The Small Animal Fast Insert for MRI detector I (SAFIR-I) is a novel Positron Emission Tomography (PET) insert designed for a Bruker BioSpec 70/30 Ultra Shield Refrigerated Magnetic Resonance Imaging (MRI) system.
  • It enables truly simultaneous quantitative PET/MRI imaging in mice and rats at high injected activities, allowing for image acquisition in seconds per frame.

Purpose of the Study:

  • To determine the key performance parameters of the SAFIR-I PET insert.
  • To evaluate its performance according to the National Electrical Manufacturers Association (NEMA) Standards Publication NU 4-2008 (NEMA-NU4) protocol.

Main Methods:

  • Performance evaluation of the SAFIR-I PET insert using NEMA-NU4 protocol.
  • Utilized specific energy and coincidence timing windows for measurements.
  • Reconstruction methods included Filtered Backprojection and 3D Reprojection.

Main Results:

  • Achieved average spatial resolution of [Formula: see text] (FWHM) at [Formula: see text] radial offset.
  • Maximal Noise-Equivalent Count Rates (NECRs) were [Formula: see text] for mouse phantoms and [Formula: see text] for rat phantoms.
  • Peak sensitivity was [Formula: see text], with image uniformity standard deviation of [Formula: see text].

Conclusions:

  • SAFIR-I meets its design goals, offering excellent performance for high-activity small animal imaging.
  • Facilitates experiments involving fast tracer kinetics in small animals.
  • Future developments, such as SAFIR-II, are expected to offer further performance enhancements.