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Biology
Posted 9 months ago

33. PolarizationinMRlis:
a) magnetizationoftheRFpulsetips awayfromB0
b) slowlyreturn ofthemagnetization to alignment withB0, causingsignal decay
c) rotationoftheexcitedmagnetizationaboutB0
d) thealignmentofprotonsinexternalmagnetic field(B0) tocreatemagnetization
e) tuningofthemagnetizationinducedcurrent (signal)in coilcloseto object
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Answer from Sia
Posted 9 months ago
Sure, let's analyze the given question about MRI polarization.

 Question:
33. Polarization in MRI is:
a) magnetization of the RF pulse tips away from B0
b) slowly return of the magnetization to alignment with B0, causing signal decay
c) rotation of the excited magnetization about B0
d) the alignment of protons in external magnetic field (B0) to create magnetization
e) tuning of the magnetization induced current (signal) in coil close to object

 
Answer
d) the alignment of protons in external magnetic field (B0) to create magnetization
Solution
a
The RF pulse tips the magnetization away from B0, but this is not polarization
b
This describes relaxation, not polarization
c
This describes precession, not polarization
d
Polarization in MRI refers to the alignment of protons in the external magnetic field (B0) to create magnetization
e
This describes signal tuning, not polarization
Key Concept
Polarization in MRI
Explanation
Polarization in MRI refers to the alignment of protons in the external magnetic field (B0) to create magnetization. This is a fundamental step in MRI as it sets up the initial condition for the subsequent RF pulse to tip the magnetization and generate a detectable signal.

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