MRI Physics Fundamentals

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A They absorb energy and tip out of alignment

B They stop spinning

C They immediately relax back to B0

D They increase their precession speed

A Longitudinal recovery of protons realigning with B0 after RF excitation

B The loss of phase coherence in the transverse plane over time

C The speed at which raw data fills k-space during acquisition

D Signal decay caused by rapidly switching gradient fields

A The systematic filling of k-space during data acquisition

B The absorption of RF energy by the proton spin system

C The longitudinal recovery of protons toward the B0 axis

D Loss of phase coherence between spinning protons in the transverse plane

A T2 applies to gradient echo sequences; T2* applies only to spin echo

B T2* includes spin-spin interactions plus field inhomogeneity effects, making T2* always shorter

C T2* measures longitudinal recovery while T2 measures transverse dephasing

D T2 and T2* are interchangeable terms for the same relaxation process

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