_______ works by capitalizing on the resonance difference between protons within their
respective microenvironments
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Selective saturation
- takes advantage of the the precession differences
between water and fat
- fat precesses slower than water
Protons aligned in the direction of the external magnet field is called ______
- what axis?
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, longitudinal magnetiziation
- aka "Z axis"
- default setting when someone is in the magnet
fMRI depends on _____ effects
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T2* effects
in spin echo, when is 180 refocusing pulse done
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at 1/2 TE
- refocusing pulse = rephasing pulse (for those photons in
transverse dimension and cancel out the T2* effects)
which is longer: phase or frequency encoding?
- do you do this on the thinner or thicker portion of the patient?
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phase encoding - therefore do this along thinner portion
- head: side to side
, - abdomen: front to back
what mathematical technique is used to convert data from "time domain" to data in
"frequency domain" = ___________
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fourier transform
what does type 1 chemical shift artifact look like
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bright rim on one side and a dark rim on the other
-- in the picture, you can tell that frequency encoding
direction is left to right
What is spatial encoding?
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, localization of the signal from MRI
relationship of SNR and RECEIVER bandwidth
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thinner receiver bandwidth , better SNR
- more signal in a smaller space, which provides a good signal for image
production
- opposite relationship of TRANSMIT bandwidth
MR Gadolinium causes T1 or T2 shortening?
- how?
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T1 shortening
- Gad is complexed with a chelate and has seven unpaired electrons
- ELECTRONS cause augmentation of the external magnetic field
which has india ink artifact - GRE or Spin Echo
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GRE
respective microenvironments
Give this one a try later!
Selective saturation
- takes advantage of the the precession differences
between water and fat
- fat precesses slower than water
Protons aligned in the direction of the external magnet field is called ______
- what axis?
Give this one a try later!
, longitudinal magnetiziation
- aka "Z axis"
- default setting when someone is in the magnet
fMRI depends on _____ effects
Give this one a try later!
T2* effects
in spin echo, when is 180 refocusing pulse done
Give this one a try later!
at 1/2 TE
- refocusing pulse = rephasing pulse (for those photons in
transverse dimension and cancel out the T2* effects)
which is longer: phase or frequency encoding?
- do you do this on the thinner or thicker portion of the patient?
Give this one a try later!
phase encoding - therefore do this along thinner portion
- head: side to side
, - abdomen: front to back
what mathematical technique is used to convert data from "time domain" to data in
"frequency domain" = ___________
Give this one a try later!
fourier transform
what does type 1 chemical shift artifact look like
Give this one a try later!
bright rim on one side and a dark rim on the other
-- in the picture, you can tell that frequency encoding
direction is left to right
What is spatial encoding?
Give this one a try later!
, localization of the signal from MRI
relationship of SNR and RECEIVER bandwidth
Give this one a try later!
thinner receiver bandwidth , better SNR
- more signal in a smaller space, which provides a good signal for image
production
- opposite relationship of TRANSMIT bandwidth
MR Gadolinium causes T1 or T2 shortening?
- how?
Give this one a try later!
T1 shortening
- Gad is complexed with a chelate and has seven unpaired electrons
- ELECTRONS cause augmentation of the external magnetic field
which has india ink artifact - GRE or Spin Echo
Give this one a try later!
GRE
