Interactive Transcript
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So in addition to obtaining the axial and coronal
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T2-weighted sequences, we also obtain a T2-weighted
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sequence with fat saturation performed utilizing
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fast spin echo, turbo spin echo techniques.
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This can be seen in this example over here.
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We perform these with fat saturation in
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order to provide greater tissue contrast.
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And this sequence actually takes a little bit
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longer to perform than the other T2-weighted
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sequences, resulting in more motion artifact.
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As a result, you often have to do this
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sequence using respiratory gating, so the
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images are obtained at end expiration.
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But we like this sequence because overall, soft
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tissue contrast resolution is much better with this
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sequence compared to our single-shot techniques.
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So how do I use this practically?
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If I see an indeterminate liver lesion, and
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I want to get a sense of what its actual T2
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signal really is, I'm going to be looking at the
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turbo spin echo fat-saturated T2-weighted sequence.
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For example, if the liver lesion has signal that is very
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close to the CSF over here, I'm not going to worry about it.
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Most likely, it's going to be a
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cyst or potentially a hemangioma.
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On the other hand, if the liver lesion has a T2
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weighted imaging appearance that's similar to
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say the spleen, I know that it may be something
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benign, but it could also be something malignant
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and something I need to work up even more.
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In some instances, the turbo spin echo sequence over here
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is replaced by an axial echo-planar imaging sequence.
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The advantage of doing it that way is
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that it can be performed more rapidly,
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providing a similar degree of tissue contrast.
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