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Week 2

9/17 - Normal Rad

CT is best for? (4 things) 1.Acute spinal or head trauma 2.Detection of small fractures 3.strokes or acute bleeds 4.thoracic and abdominal imaging
MRI is best for? (4 things) 1.Neuro-musculoskeletal imaging 2.marrow pathology 3.articular pathology 4.brain, spinal cord and meninges
When does the cortex show up white? (CT or MRI) CT... (on a MRI the cortex is black)
***What is the easiest way to tell the difference b/w CT and MRI? look at the cortex (CT = cortex is white; MRI = cortex is black)
MRI is best for almost anything, however you should use a CT on what? Use a CT for fractures of small bones, and areas of the chest and abdominal area b/c MRI has big problem with motion
***What is the number one enemy of MRI? Motion
On a MRI what color is considered a high signal? a low signal? high signal = white; low signal = dark
***What are the advantages of a closed magnet MRI, a open magnet MRI, and a stand up magnet MRI? 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.
What are coils on a MRI? they are basically antennas that capture info and send it to the computer
Imaging Voxel...hmmm I didn't really understand what in the world he was trying to say with this. ***However???? Bigger the cube = Larger Signal BUT less resolution...Smaller cubes = smaller signal, BUT more resolution. You need a mixture of both
***Contrast or Not? When should you use contrast? Contrast will show all the inflammed areas. If you suspect a tumor or infection use conrast.
What is the name of the chemical used as contrast? Gadolinium-diethylenetriamine pentaacetic acid (Gd-DTPA)....Duh - its a paramagnetic compound
***Can contrast be evaluated on T1 or T2 images? Contrast can ONLY be evaluated on T1 b/c it has similar properties as fat.
Created by: pcc Normal Rad
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