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The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
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Ultra-high-sensitivity submillimeter mouse SPECT.

Oleksandra Ivashchenko1, Frans van der Have2, Marlies C Goorden3

  • 1Section of Radiation, Detection, and Medical Imaging, Delft University of Technology, Delft, The Netherlands MILabs B.V., Utrecht, The Netherlands; and Department of Translational Neuroscience, Brain Center Rudolf Magnus, University Medical Center Utrecht, Utrecht, The Netherlands o.ivashchenko-1@tudelft.nl.

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Summary
This summary is machine-generated.

This study introduces an ultra-high-sensitivity pinhole SPECT system for small animals. This advanced SPECT imaging allows for detailed scans using very low tracer amounts and enables subsecond imaging of dynamic processes.

Keywords:
SPECTdynamic imaginglow-dosemolecular imagingpinhole

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Area of Science:

  • Nuclear medicine
  • Medical imaging
  • Biomedical engineering

Background:

  • Single Photon Emission Computed Tomography (SPECT) typically requires high tracer amounts and offers limited temporal resolution.
  • Developing SPECT protocols with sub-megabecquerel tracer amounts or subsecond time resolution is crucial for novel applications like low-yield tracer screening and imaging low receptor densities.

Purpose of the Study:

  • To develop and evaluate a dedicated ultra-high-sensitivity pinhole SPECT system for small-animal imaging.
  • To enable advanced SPECT imaging protocols with reduced tracer activity and improved temporal resolution.

Main Methods:

  • A stationary small-animal SPECT system was designed with a custom cylindric collimator featuring 54 focused conical pinholes.
  • System matrix for image reconstruction was determined using a hybrid approach combining (99m)Tc point source measurements and ray-tracing analytic modeling.
  • SPECT images were reconstructed with pixel-based ordered-subsets expectation maximization and validated using phantoms and various mouse scans (bone, kidney, cardiac).

Main Results:

  • The developed SPECT system achieved a peak sensitivity of 1.3% (13,080 cps/MBq).
  • A spatial resolution of 0.85 mm was obtained, allowing high-detail bone SPECT scans with as little as 0.25 MBq of activity.
  • Dynamic kidney and cardiac mouse scans demonstrated time-frame resolution down to 1 second.

Conclusions:

  • The ultra-high-sensitivity SPECT system significantly enhances the capabilities for in vivo mouse imaging.
  • It facilitates imaging with less than 1 MBq of tracer activity and enables dynamic imaging with 1-second frame resolution.
  • This advancement broadens the scope of SPECT applications in preclinical research.