Interactive Transcript
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All right, so the next T2 sequence that we're
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going to review is the T2 with fat saturation.
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So in addition to the axial and coronal
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images without fat saturation,
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we perform a coronal with fat saturation.
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We don't repeat that in the axial plane because I think
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that's redundant and probably not needed, but you do
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want to get a fat-saturated image in one of the planes.
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The main reason for including this in addition to
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the non-fat-saturated images is to really bring
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out any areas of inflammation or areas of edema.
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13 00:00:29,580 --> 00:00:31,260 So this is a fairly normal exam, and we
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don't have a lot of inflammation or edema.
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And what you'll see with this fat-saturated sequence
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is that if there was, the, the wall of the bowel
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would be brighter than the adjacent fat and muscle.
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And so looking for edema, you can't
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beat the fat-saturated sequence.
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Another advantage is that sometimes with
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chronic inflammation, we'll actually
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get fat within the wall of the bowel.
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And so you need the fat-saturated
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sequence to differentiate
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those T2 images that have fat in the wall versus
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the ones that have true edema in the wall.
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And so that's the main use for this, and you
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use it in conjunction with the coronal T2
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images without fat saturation to help you.
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The other T2 type sequence that we do is the true
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FISP sequence or steady-state free precession.
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So this is a... we use MRI.
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So it's a true FISP, but certainly
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Fiesta for GE and Phillips has a similar
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sequence, depending on your vendor.
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For this sequence, the main advantages are
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it's so fast that you don't have that
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same problem with the intraluminal defects.
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And so as you look through this bowel,
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what you see is that it's all very well
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pacified, except for these areas, which are
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air in the bowel.
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Of course, with the prone patient,
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it's on the anti-dependent side.
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So it's on the, on the, towards the sacrum.
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But other than that, everything in this
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is a true bowel intraluminal defect.
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If you have a patient with Kutzinger's or
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something where you're looking for masses,
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the True FISP sequence ends up being one of the most
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critical sequences because it's much better
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at finding things in the lumen of the bowel.
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And we do this in two planes.
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We do it axial and coronal.
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It may not be necessary, but it's such a
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fast sequence and you give up so little by
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doing it that I would recommend doing that.
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Another advantage is sometimes patients with
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motion or patients where the bowel peristalsis is not
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great from the glucagon or whatever antiperistaltic
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you give, the True FISP will still turn out
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wonderful because it's such a fast sequence, even
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though your T2 sequences may not be as strong.
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All right, so that's it for T2 sequences, and now
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we'll move on to some of the other pieces of the exam.
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