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Using Coils

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Imaging of the wrist carries with it

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some pitfalls and a lot of options.

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The first option is to put the arm up

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over the head in the Superman position.

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Now, for an old geezer like me, extremely uncomfortable

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to lie in that position for 30 minutes or more.

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In fact, for athletes, it's even uncomfortable.

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But, it has an advantage.

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It allows you to take what are very

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flexible coils, put them flatly against the

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wrist, and obtain a small field of view.

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In fact, smaller fields of view than you

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would get if the arm was lying at the side.

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Notice, too, you've got a larger circular

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flat coil and a smaller circular flat coil.

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This one, for a smaller field

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of view but better penetration.

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And this one, for a larger field

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of view, with less penetration.

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But still, this overhead Superman

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position, while uncomfortable, can

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generate some extremely high resolution.

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And we've also got more rigid coils.

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The rigid coils are usually

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used with the arm at the side.

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The hand can be pronated, important in your

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assessment of anatomy, since certain structures,

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like the extensor carpi ulnaris, will shift.

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In the pronated position, or you can

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have a rigid, rectangular coil with the

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arm or hand in the neutral position.

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This would also give you a different

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appearance of the relative positioning

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of certain structures, like tendons,

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relative to skeletal structures.

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So, soft coils, arm over the head.

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Hard coils, arm at the side.

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You can also use the soft

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coils with the arm at the side.

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But you're going to get a smaller field of view

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with higher resolution with the arm over the head.

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This will become more important when

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we deal with the hand and the fingers.

Report

Faculty

Stephen J Pomeranz, MD

Chief Medical Officer, ProScan Imaging. Founder, MRI Online

ProScan Imaging

Tags

Musculoskeletal (MSK)

MRI

Idiopathic

Hand & Wrist

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