MRI Image Contrast/Weighting

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Author:
hrmckensey1015
ID:
310683
Filename:
MRI Image Contrast/Weighting
Updated:
2015-10-31 11:32:43
Tags:
mri contrast weighting
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Description:
MRI scan principles of Image Contrast and weighting
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  1. What is the TR?
    • Repetition time
    • Time between two 90* RF excitation pulses
  2. What is TE?
    • Echo time
    • Time between the 90* RF pulse and the peak of the signal in the receiver coil
  3. T1 images have a ____ TR and _____ TE
    • Short TR
    • Short TE
  4. A shorter TR will produce an image with _______.
    More T1 weighting
  5. A T1 weighted image will have a TR range of _____
    350-700 ms
  6. A T1 weighted image has an TE range of _____
    10-30ms
  7. Proton Density weighting has a ___TR and ____TE
    • Long TR
    • Short TE
  8. PD weighting has a TR range of ______
    1600-4000ms
  9. PD weighting has a TE range of _____
    10-30ms
  10. T2 weighted images have a _____TR and a ____TE
    • Long TR
    • Long TE
  11. T2 weighted images have a TR range of ____
    2000-6000ms
  12. T2 weighted images have a TE range of ____
    80-120ms
  13. Using a longer TE will produce a ______ weighted image
    increased T2 weighting
  14. T2 weighted images provide ___signal from fluids and fat is typically ____
    • bright signal
    • dark
  15. T1 scans are useful for____
    anatomy
  16. T2 scans are utilized for depicting____
    pathology
  17. Image contrast in An inversion recovery sequence is controlled by_____
    TR, TE and TI
  18. What is an inversion recovery pulse sequence?
    a spin echo pulse sequence preceded by a 180* RF pulse
  19. What is the TI?
    time between 180* preparation pulse and the 90* excitation pulse
  20. If the TI is long then you have a _____sequence that surpasses signal from ___
    • FLAIR
    • Fluid
  21. What are extrinsic contrast parameters?
    • Those that MR technologist can adjust to alter the image
    • Flip angle, TR, TE, TI, ETL
  22. Intrinsic parameters are _____
    • specific to each tissue and cannot be changed
    • ADC, T1/T2 time, specific proton density and flow
  23. Which structures will always appear black on an MR image?
    • Air
    • Tendons
    • Ligaments
    • Cortical bone
    • Metallic susceptibility

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