Proton magnetic moment flip angle 54.7 in an external magnetic field

In summary, the angle between the direction of the proton magnetic moment μ and the direction of the external magnetic field in MRI is 54.7°. This value was determined theoretically based on the fixed angular momentum P and the quantization of the component Pz in the presence of a magnetic field in the z direction. This results in the angle between P and z being cos-11/√3, or 54.74°.
  • #1
mkj
5
0
i am reading about MRI. i have seen several in several textbooks that the angle between the direction of the proton magnetic moment μ and the direction of the external magnetic field is 54.7
how did they find that theoretical or experimental
if theoretical how can we calculate that
 
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  • #2
hi mkj! :smile:

loosely speaking, the angular momentum P is fixed

if there's no magnetic field, there's no problem … the "spin axis" can be in any direction

if there is a magnetic field in the z direction, the component Pz is quantised, and (for a spin-half particle) must be P/√3

so the angle between P and z must be cos-11/√3, = 54.74°

(see eg http://www.chem.wisc.edu/areas/reich/nmr/05-hmr-00-nmr.htm)
 

What is the proton magnetic moment flip angle 54.7 in an external magnetic field?

The proton magnetic moment flip angle 54.7 is a measurement of the angle at which the magnetic moment of a proton flips in an external magnetic field. It is a characteristic property of protons, which are subatomic particles with a positive charge. This flip angle is important in nuclear magnetic resonance (NMR) studies, as it can provide information about the structure and dynamics of molecules.

How is the proton magnetic moment flip angle 54.7 measured?

The proton magnetic moment flip angle 54.7 is typically measured using NMR spectroscopy. In this technique, a sample containing protons is placed in an external magnetic field and exposed to radio waves. By measuring the energy absorbed by the protons, the flip angle can be determined.

What is the significance of the proton magnetic moment flip angle 54.7?

The proton magnetic moment flip angle 54.7 is significant because it provides information about the behavior of protons in an external magnetic field. This can be used to study the structure and dynamics of molecules, which is important in fields such as chemistry, biochemistry, and materials science.

Can the proton magnetic moment flip angle 54.7 be changed?

No, the proton magnetic moment flip angle 54.7 is a characteristic property of protons and cannot be changed. However, it can be influenced by external factors such as temperature, magnetic field strength, and chemical environment.

How does the proton magnetic moment flip angle 54.7 affect MRI images?

The proton magnetic moment flip angle 54.7 is a key factor in determining the contrast and resolution of MRI images. By adjusting the flip angle, it is possible to control the contrast and highlight specific features in the image. This is important in medical imaging for diagnosing and monitoring various conditions.

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