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Medical Imaging > NMR/MRI > Flashcards

NMR/MRI Flashcards

1
Q

What does NMR give details on

A

H density
Spin-lattice interactions
Spin-spin interactions

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2
Q

How does the spin-echo system work

A
  1. Apply 90° pulse, switched off, T2 de phased
  2. After TE/2 apply 180° pulse(spins start rephasing)
  3. Envelope of the maxima of FID gives tissue relaxation T2
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3
Q

What does phase expanding give us and how

A

2D image from FT

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4
Q

What is an exhogenic contrast agent

A

External paramagnetic substance

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5
Q

What is an endogenic contrast agent

A

Paramagnetic substance already present in the organism

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Medical Imaging (5 decks)

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