Term
|
Definition
| what is the wavelength of the electomagnetic radiation used for medical imaging? |
|
|
Term
|
Definition
| what is the densest bone in the body? (or at least in imaging of the head and neck) |
|
|
Term
| PA, the x-ray is shot posterior to anterior, so the film is on the anterior side catching it, and thus closer to the structures you want to view. |
|
Definition
| if you want to see someone's anterior chest, do you want PA or AP x-rays? why? |
|
|
Term
| more absorbance/scatter = less exposure |
|
Definition
| if a tissue absorbs/scatters more radiation, will there be more or less exposure of the film? |
|
|
Term
|
Definition
| list the advantages of plain radiography(x ray) |
|
|
Term
1) bone, (esp for fracture diagnosis)
2) vessels (with contrast media)
3) teeth
4) detecting fluid in the sinuses
5) detecting foreign objects (especially metal) |
|
Definition
| what is plain radiography good for visualizing? |
|
|
Term
1) cannot isolate structures or view 3-D very well
2) hard to distinguish soft tissues
3) ionizing radiation |
|
Definition
| what are the disadvantages of plain radiography? |
|
|
Term
| it is opposite normal x-rays, air is white, dense bone is dark |
|
Definition
| what is white in fluroscopy? |
|
|
Term
to make x-ray movies the clinician can view in real time
often used for:
1) joint fxn (esp TMJ)
2) swallowing disorders |
|
Definition
| what is fluroscopy used for? |
|
|
Term
1) better ability to visualize gray tissues
2) discreet slices of the body can be views without superimposing anything
2) a single series of scans can be viewed from any angle
3) image parameters (brightness/contrast) can always be changed
4) segmentation and isosurfaces are possible |
|
Definition
| what are the advantages of CT of plain films? |
|
|
Term
| a volume (a collection of axial slices) |
|
Definition
| what is a series of CT scans called? |
|
|
Term
|
Definition
| what is the basic unit of a CT? |
|
|
Term
| Computed X-ray Tomography |
|
Definition
| what is the full name of CT? |
|
|
Term
It is a surface that represents points of a constant value (e.g. pressure, temperature, velocity, density) within a volume of space
a 3d model of something, like a blood vessel, with the other layers stripped off |
|
Definition
|
|
Term
1)expensive, not always accessible
2) ionizing radiation exposure
3) metal causes artifacts |
|
Definition
| list the disadvantages of CT |
|
|
Term
1) has same advantages over plain film as CT
2) often better with soft tissue imaging than CT
3) does not use ionizing radiation |
|
Definition
| list the advantages of MRI |
|
|
Term
1) expensive, not always accessible
2) not good for mineralized tissue (bones and teeth)
3) can be freaky, it takes a while and you are in a small space
4) cant use on patients with metallic parts |
|
Definition
| list some disadvantages of the MRI |
|
|
Term
| describes the locations of structures in the orbit relative to the extrinsic eye muscles |
|
Definition
| what does extraconal and intraconal mean? |
|
|
Term
|
Definition
| name the most common melanomas inside the eye |
|
|
Term
| persistent metopic suture |
|
Definition
| slide 65: this fracture is most likely to be a |
|
|
Term
| it looks for nerve like material and follows the tracts of it, like white matter tracts |
|
Definition
|
|
