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What planes does an MRI image?
What is an MRI best to view?
What is the contrast dye used in MRI?
What precautions do you have to take with gadolinium use?
Nephrotoxic (cannot use with renal failure patients)
Contraindications to MRI
•Metal implants or clips
•Metal clips, watches, piercings must be removed
•Kidney function must be checked for dye
How does MRI work?
•Most tissues in body are made up of water à Hydrogen aligns (protons)
•Once the magnetic field is turned off a radio wave is sent and the signal is measured by receiver coils
T1 weighted image (anatomy)
•Bone --> white
•Tendons/ligaments --> black
•Muscle --> grey
T2 weighted image
- shows PATHOLOGY
How deep are most MRI slices?
What do you se on T1W
- bright= fat, bone marrow, blood products
- dark= air
- grey= ligaments/tendons
what do you se on a T2WI
- FITS= BIGHT TO INTERMEDIATE
- BRIGHT ON T2= PATHOLOGIC
MRI views in foot:
Sagittal, axial, coronal
Sagittal ⇾ similar to lateral x-ray view
Axial ⇾ similar to DP x-ray views
Coronal ⇾ similar to AP x-ray views
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