Parahydrogen-Based Hyperpolarization for Biomedicine.

Area of Science:

• Physics
• Chemistry
• Biomedical Science

Background:

• Magnetic resonance (MR) is a powerful tool for imaging and molecular analysis.
• Limited nuclear spin polarization restricts the full potential of MR.
• Hyperpolarization methods aim to increase polarization and signal strength.

Purpose of the Study:

• To provide a selective overview of parahydrogen (pH2)-based hyperpolarization techniques.
• To cover recent developments in pH2 hyperpolarization for biomedical applications.

Main Methods:

• Utilizing the stable and long-lived singlet spin state of parahydrogen (pH2).
• Transferring spin order from pH2 to other molecules to enhance MR signals.
• Reviewing advancements in spin physics, catalysis, instrumentation, and contrast agent preparation.

Main Results:

• Parahydrogen-based hyperpolarization enhances MR signals by several orders of magnitude.
• Significant progress has been made in pH2 hyperpolarization techniques over the past decade.
• These methods enable enhanced sensitivity for biomedical imaging and chemical analysis.

Conclusions:

• Parahydrogen hyperpolarization offers a unique and effective strategy to overcome MR signal limitations.
• The reviewed developments pave the way for broader applications in biomedical research and diagnostics.
• Continued innovation in pH2 hyperpolarization promises to further expand MR's capabilities.