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THOME
PHYSICAL PRINCIPLES
Signal Generation
THOME
nuclei, protons and spins
longitudinal relaxation T1
transverse relaxation T2
exitation and relaxation
relation between T1 and T2
signal generation
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transverse relaxation T2
Spin - Spin relaxation
signal generation
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signal generationtransverse relaxation T2
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signal generationtransverse relaxation T2
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signal generationtransverse relaxation T2
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signal generationtransverse relaxation T2
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signal generationtransverse relaxation T2
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signal generationtransverse relaxation T2
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signal generationtransverse relaxation T2
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signal generationtransverse relaxation T2
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signal generationtransverse relaxation T2
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signal generationtransverse relaxation T2
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signal generationtransverse relaxation T2
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Signal
signal generationtransverse relaxation T2
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Signal
signal generationtransverse relaxation T2
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Signal
signal generationtransverse relaxation T2
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Signal
signal generationtransverse relaxation T2
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Signal
dephasing
signal generationtransverse relaxation T2
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S
time
Free Induction Decay signal
FID
T2
signal generationtransverse relaxation T2
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T2
S
T2
63%
definition T2:
the time that passes untill 63% of the original signal has been lost
time
signal generationtransverse relaxation T2
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T2
S
T2*
time
signal generationtransverse relaxation T2*
Due to magnetic inhomegeneities the transverse relaxation is lost faster !! T2 T2*
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signal generationtransverse relaxation T2
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transmitcoil
radiofrequencytransmitter
signal generationtransverse relaxation T2
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transmitcoil
radiofrequencytransmitter
180º
180º
signal generationtransverse relaxation T2
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180º
signal generationtransverse relaxation T2
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180º
signal generationtransverse relaxation T2
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180º
signal generationtransverse relaxation T2
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180º
signal generationtransverse relaxation T2
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180º
signal generationtransverse relaxation T2
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180º
signal generationtransverse relaxation T2
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180º
signal generationtransverse relaxation T2
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180º
signal generationtransverse relaxation T2
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180º
signal generationtransverse relaxation T2
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180º
signal generationtransverse relaxation T2
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180º
refocusing pulse
signal generationtransverse relaxation T2
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refocusing pulse
signal generationtransverse relaxation T2
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T2 envelope
signal generationtransverse relaxation T2
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in conclusion:
• T1 relates to magnetisation
• T2 relates to signal
signal generation
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nuclei, protons and spins
longitudinal relaxation T1
transverse relaxation T2
excitation and relaxation
relation between T1 and T2
signal generation
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