High Xe density, high photon flux, stopped-flow spin-exchange optical pumping: Simulations versus experiments

Area of Science:

• Medical Imaging
• Atomic Physics
• Chemical Physics

Background:

• Spin-exchange optical pumping (SEOP) significantly boosts noble gas NMR sensitivity.
• Hyperpolarized 129Xe (HP 129Xe) is a promising lung imaging contrast agent.
• Economical, high-polarization HP 129Xe production remains a clinical barrier.

Purpose of the Study:

• To modify and validate the standard SEOP model using Xe-rich stopped-flow datasets.
• To investigate methods for increasing HP Xe production efficiency in stopped-flow SEOP.
• To gain deeper insight into the physics of Xe-rich stopped-flow SEOP at high laser fluxes.

Main Methods:

• Modification of the standard SEOP model.
• Validation against two Xe-rich stopped-flow SEOP datasets.
• Analysis of factors influencing HP Xe production efficiency.

Main Results:

• The modified SEOP model shows good agreement with experimental data.
• Identified pathways to enhance HP Xe production in stopped-flow systems.
• Provided new understanding of Xe-rich stopped-flow SEOP under high laser conditions.

Conclusions:

• The refined SEOP model is effective for analyzing and optimizing stopped-flow 129Xe polarizers.
• Improvements in HP 129Xe production efficiency are achievable.
• Further research into SEOP physics can advance clinical applications of HP 129Xe imaging.