Undergrad MRI synchronization with the IRF90

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In MRI physics, synchronization occurs after an RF90 pulse, causing protons to precess in the XY plane, which is logical for vector representation. However, the IRF180 pulse only flips the vector without achieving synchronization, raising questions about the nature of resonance in this context. The discussion highlights the difference in vector orientation after a 180-degree rotation, emphasizing that the vector remains aligned along the z-axis post-flip. Understanding these dynamics is crucial for grasping MRI signal behavior. The inquiry seeks clarity on the resonance mechanisms involved in these processes.
Bayoudh101
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Hello ,

In MRI physics , I don't seem to be able to wrap my head around the synchronization in the precession of the protons after an RF90 impulse (which is an electromagnetic impulse that would deviate the precessing magnetic field axe by 90 degrees) the synchronization would give the vector length on the XY plane and that's logical , but why doesn't synchronization happen with the IRF180 pulse ? Which only seems to flip the vector ? Can someone please explain the origin of this resonance ?

Thank you .
 
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Bayoudh101 said:
the synchronization would give the vector length on the XY plane and that's logical , but why doesn't synchronization happen with the IRF180 pulse ? Which only seems to flip the vector ?
If you start with a vector aligned along the z axis and you rotate it by 180 deg, then how much of the vector is in the xy plane?
 

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