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How are MRI’s produced
Interaction between hydrogen containing molecules in tissues and magnetic field
How are unique images produced by MRIs?
each tissue has a different amount of hydrogen so they relax at different rates
What does bright white mean on an MRI
tissue that contains a high amount of water (like fat)
The _________ and __________ of the pulses produces different signal intensities of the same tissues
length, sequence
the time that elapses between two consecutive radio wave pulses
Repetition Time (TR)
the time selected to wait after the start of the TR to receive the signal or “echo” from the patient
Echo Time (TE)
What is a T1 image used for?
anatomy visualization
how is a T1 weighted image produced?
using short TE and TR
how is a T2 weighted image produced?
using a longer TE
What is shown by a T2 image?
pathology
What color do pathologies appear on a T2 image?
white
what planes are MRIs acquired in?
all 3
Advantages of MRIs
best soft tissue visualization, no radiation
Disadvantages of MRIs
cannot use in patients who work with metals, have metal pacemakers or other implanted devices
What structures is MRI better to view?
spongy bone, soft tissue, cartilage
What structures is CT better to view?
cortical bone, calcifications, acute intracranial bleeding
Note
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