Evaluation of an MR-compatible blood sampler for PET

Area of Science:

• Medical Imaging
• Biomedical Engineering
• Nuclear Medicine

Background:

• Hybrid imaging combines Magnetic Resonance Imaging (MRI) and Positron Emission Tomography (PET) for advanced research.
• Accurate quantification in PET imaging relies on knowing the arterial input function (AIF) of radiotracers.
• Existing methods for AIF determination can be challenging in combined MR-PET setups.

Purpose of the Study:

• To develop and validate an MR-compatible blood sampling system for precise AIF measurement.
• To improve the utility of the PET component in integrated MR-PET scanners.
• To facilitate accurate tracer kinetic modeling in pre-clinical and clinical MR-PET studies.

Main Methods:

• Designed and constructed a dedicated blood sampling system featuring an LSO/APD detector for coincidence photon counting.
• Ensured the system's compatibility with MRI environments through rigorous testing.
• Validated detector performance and conducted in-vivo measurements of AIF in rats.

Main Results:

• The developed blood sampling system demonstrated successful MR compatibility.
• The LSO/APD detector assembly accurately measured annihilation photons for coincidence detection.
• Reliable arterial input function measurements were obtained in rat MR-PET studies.

Conclusions:

• The novel MR-compatible blood sampling system is a practical and dependable tool for AIF quantification in MR-PET research.
• This system enhances the potential of PET imaging within hybrid MR-PET scanners.
• Accurate AIF measurements are crucial for advancing tracer-based diagnostics and research using MR-PET technology.