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T2 Sequences Part 2

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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

0:15

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

1:01

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

1:09

images without fat saturation to help you.

1:12

The other T2 type sequence that we do is the true

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FISP sequence or steady-state free precession.

1:19

So this is a... we use MRI.

1:22

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.

1:46

Of course, with the prone patient,

1:48

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.

Report

Faculty

Benjamin Spilseth, MD, MBA, FSAR

Associate Professor of Radiology, Division Director of Abdominal Radiology

University of Minnesota

Tags

Non-infectious Inflammatory

MRI

Large Bowel-Colon

Idiopathic

Gastrointestinal (GI)

Crohn’s Disease

Body

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