Question 15
Explain briefly the main principles of the use of
magnetic resonance to obtain diagnostic information about internal body
structures. [8]
Reference: Past Exam Paper – June 2011 Paper 42 & 43 Q10
Solution:
A strong / large (uniform)
magnetic field is applied which causes the nuclei to precess / rotate about the
field direction.
A (r.f) radio frequency
pulse is applied at the Larmor frequency which causes resonance / nuclei absorb
energy.
On relaxation /
de-excitation, the nuclei emit r.f pulse which is detected and processed.
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