Quiz: Hyperpolarization, Schröder

The polarization of a spin system in thermal equilibrium depends on:

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Which general principle do the hyperpolarization techniques PHIP, DNP and SEOP have in common?

Hyperpolarization is created at very low temperatures T in the target
Hyperpolarization is transferred from a highly polarized precursor to the target
Hyperpolarization is transferred via a chemical reaction to the target
Hyperpolarization is transferred via electrons to the target

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Which general principle do the hyperpolarization techniques PHIP, DNP and SEOP have in common?

Non-renewable longitudinal magnetization requires efficient acquisition strategies
Transverse relaxation rates are enhanced in the hyperpolarized state
Hyperpolarized magnetization needs to be transferred from heteronuclei to protons before detection
The smaller gyromagnetic ratio of heteronuclei compared to 1H requires weaker gradient fields for imaging

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What is the advantage of using the HYPER-CEST method?

It enhances sensitivity due to a further gain in hyperpolarization
It enhances sensitivity by prolonging longitudinal relaxation times
It enhances sensitivity by transferring spin polarization from a precursor molecule to the target
It enhances sensitivity by accumulating sensor-specific depolarization

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