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Explain the theory of operation behind MRI contrast agents.
Explain the theory of operation behind MRI contrast agents.
MRI contrast agents work by shortening or altering the T1 relaxation time of nearby water protons, which affects the contrast in the MR image by changing the spin polarization detected by the receiver.
How do MRI scanners polarize the hydrogen nuclei in body tissues?
How do MRI scanners polarize the hydrogen nuclei in body tissues?
MRI scanners expose sections of the body to a strong magnetic field, causing the hydrogen nuclei of water in tissues to be polarized in the direction of the magnetic field.
What is the role of gadolinium-based contrast agents (GBCAs) in MRI?
What is the role of gadolinium-based contrast agents (GBCAs) in MRI?
Gadolinium-based contrast agents are the most commonly used compounds for contrast enhancement in MRI, as they help improve the visibility of internal body structures.
What is the main source of contrast in MR images, according to the text?
What is the main source of contrast in MR images, according to the text?
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How do contrast agents affect the T1 relaxation time of nearby water protons?
How do contrast agents affect the T1 relaxation time of nearby water protons?
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Who were the researchers who obtained the first MR images of a human brain in 1978?
Who were the researchers who obtained the first MR images of a human brain in 1978?
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What technique did Arno Villringer and colleagues demonstrate in 1988?
What technique did Arno Villringer and colleagues demonstrate in 1988?
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Who recognized that oxygen-depleted blood with dHb was attracted to a magnetic field, leading to the discovery of the technique underlying Functional Magnetic Resonance Imaging (fMRI)?
Who recognized that oxygen-depleted blood with dHb was attracted to a magnetic field, leading to the discovery of the technique underlying Functional Magnetic Resonance Imaging (fMRI)?
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In the early 1980s to the early 1990s, what inspiration led to the use of 'Jedi' helmets in MRI?
In the early 1980s to the early 1990s, what inspiration led to the use of 'Jedi' helmets in MRI?
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What was the purpose of the 'Jedi' helmets worn by children in MRI in the early 1980s to the early 1990s?
What was the purpose of the 'Jedi' helmets worn by children in MRI in the early 1980s to the early 1990s?
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