Question 1

Describe the reasons why direct measurements of T1 and T2 are not used for magnetic resonance imaging.

Accepted Answer

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Question 2

Magnetic field gradient causes different magnetic fields at different positions and different Larmor frequencies. This frequency variation can be used to determine the location of different anatomical features during reconstruction of an image.

Accepted Answer

The magnetic field gradient is a crucial component in MRI technology, as it allows for spatial encoding of the MRI signal. By varying the magnetic field at different locations, it induces different Larmor frequencies in the spins of nuclei in the body. This variation in frequency is used to map the precise location of these spins, enabling the reconstruction of detailed images of the body's internal structures.

Question 3

Show that, in order to obtain 100 MHz for the Larmor frequency of the protons in a magnetic field, a NMR magnet with a magnetic field of 2.349 T has to be used.
[Note: Take the gyromagnetic ratio for the proton as ã = 42.58 MHz/T.]

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The answer of Show that, in order to obtain 100...

Question 4

What is a physical cause of spin echo?

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Question 5

Why is the nuclear magnetic resonance (NMR) effect useful for structural analysis of pure organic molecules in organic chemistry?

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Question 6

Which of the MRI modes is the most similar to a CT scan? What are the similarities, and what are the differences between the two?

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Question 7

In nuclear magnetic resonance imaging, we do not use direct measurements of time constants T1 and T2.

Accepted Answer

Nuclear magnetic resonance imaging (MRI) uses indirect methods to infer T1 and T2 relaxation times, rather than direct measurements, through the manipulation of pulse sequences and signal analysis.

Question 8

Briefly explain the nuclear magnetic resonance (NMR) effect.

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Question 9

Why is the nuclear magnetic resonance (NMR) effect useful for structural analysis of human tissue?

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