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NMR of laser-polarized 129Xe in blood foam
C H Tseng1, S Peled, L Nascimben
1Brigham and Women's Hospital, Boston, Massachusetts 02115, USA.
Abstract:
Laser-polarized 129Xe dissolved in a foam preparation of fresh human blood was investigated. The NMR signal of 129Xe dissolved in blood was enhanced by creating a foam in which the dissolved 129Xe exchanged with a large reservoir of gaseous laser-polarized 129Xe. The dissolved 129Xe T1 in this system was found to be significantly shorter in oxygenated blood than in deoxygenated blood. The T1 of 129Xe dissolved in oxygenated blood foam was found to be approximately 21 (+/-5) s, and in deoxygenated blood foam to be greater than 40 s. To understand the oxygenation trend, T1 measurements were also made on plasma and hemoglobin foam preparations. The measurement technique using a foam gas-liquid exchange interface may also be useful for studying foam coarsening and other liquid physical properties.
Insights
Laser-polarized 129Xe NMR in human blood foam shows signal enhancement. Dissolved 129Xe has a shorter T1 relaxation time in oxygenated blood compared to deoxygenated blood.
Area of Science:
- Nuclear Magnetic Resonance (NMR) Spectroscopy
- Biophysics
- Medical Imaging
Background:
- Laser-polarized 129Xe offers enhanced NMR sensitivity.
- Investigating dissolved gas dynamics in biological fluids is crucial for medical applications.
- Foam preparations can increase gas-liquid exchange interfaces.
Purpose of the Study:
- To investigate laser-polarized 129Xe dissolved in human blood foam.
- To measure the T1 relaxation time of 129Xe in oxygenated versus deoxygenated blood.
- To explore the potential of foam-based NMR for studying blood properties.
Main Methods:
- Preparing fresh human blood as a foam.
- Utilizing laser-polarized 129Xe gas for dissolution and exchange.
- Measuring the T1 relaxation time of dissolved 129Xe in blood foam under varying oxygenation levels.
Main Results:
- Signal enhancement of 129Xe NMR in blood foam due to gas exchange.
- Significantly shorter T1 relaxation time for 129Xe in oxygenated blood foam (~21 s) compared to deoxygenated blood foam (>40 s).
- T1 measurements on plasma and hemoglobin foam preparations corroborated the oxygenation trend.
Conclusions:
- The T1 relaxation time of laser-polarized 129Xe in blood foam is sensitive to blood oxygenation.
- This technique provides a novel method for probing blood oxygen status using NMR.
- The foam gas-liquid exchange interface method shows promise for studying liquid physical properties and biological systems.