MRI synchronization with the IRF90

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    Mri Synchronization
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SUMMARY

The discussion focuses on the synchronization of proton precession in MRI physics following RF90 and RF180 impulses. The RF90 impulse causes a 90-degree deviation in the magnetic field, resulting in synchronization that defines vector length on the XY plane. In contrast, the RF180 impulse merely flips the vector without inducing synchronization, leading to confusion about the resonance origin. The key takeaway is that RF90 creates a vector component in the XY plane, while RF180 does not contribute to this synchronization.

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  • Understanding of MRI physics principles
  • Knowledge of RF pulse sequences in MRI
  • Familiarity with proton precession dynamics
  • Basic concepts of vector mathematics in three-dimensional space
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  • Explore the concept of resonance in magnetic fields
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Medical physicists, MRI technologists, and students studying MRI technology will benefit from this discussion, particularly those interested in the mechanics of RF pulses and their effects on imaging quality.

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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