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Week 2 Test

Enter the letter for the matching Answer
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1.
***Contrast or Not? When should you use contrast?
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2.
What is the name of the chemical used as contrast?
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3.
On a MRI what color is considered a high signal? a low signal?
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4.
***What are the advantages of a closed magnet MRI, a open magnet MRI, and a stand up magnet MRI?
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5.
Imaging Voxel...hmmm I didn't really understand what in the world he was trying to say with this. ***However????
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6.
When does the cortex show up white? (CT or MRI)
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7.
***Can contrast be evaluated on T1 or T2 images?
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8.
CT is best for? (4 things)
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9.
What are coils on a MRI?
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10.
MRI is best for? (4 things)
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11.
MRI is best for almost anything, however you should use a CT on what?
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12.
***What is the easiest way to tell the difference b/w CT and MRI?
A.
Contrast can ONLY be evaluated on T1 b/c it has similar properties as fat.
B.
CT... (on a MRI the cortex is black)
C.
1.Neuro-musculoskeletal imaging 2.marrow pathology 3.articular pathology 4.brain, spinal cord and meninges
D.
Gadolinium-diethylenetriamine pentaacetic acid (Gd-DTPA)....Duh - its a paramagnetic compound
E.
high signal = white; low signal = dark
F.
Use a CT for fractures of small bones, and areas of the chest and abdominal area b/c MRI has big problem with motion
G.
they are basically antennas that capture info and send it to the computer
H.
Closed - is simply the best, more homogeneous and higher magnification. Use a open magnet for children and those who are claustrophobic. Use a stand up magnet if you want to see a piece of anatomy in a certain position.
I.
Bigger the cube = Larger Signal BUT less resolution...Smaller cubes = smaller signal, BUT more resolution. You need a mixture of both
J.
look at the cortex (CT = cortex is white; MRI = cortex is black)
K.
Contrast will show all the inflammed areas. If you suspect a tumor or infection use conrast.
L.
1.Acute spinal or head trauma 2.Detection of small fractures 3.strokes or acute bleeds 4.thoracic and abdominal imaging
Type the Answer that corresponds to the displayed Question.
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13.
***What is the number one enemy of MRI?

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