| Question |
Answer |
| 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. |
Buen Viaje lv.2 ch 8
