Flashcards in Chapter 1 Deck (38):
What are the five basic densities?
Soft tissue or fluid
Dense objects appear ____ on an x-ray
Air appears ______ on conventional radiographs.
How does fat appear on a radiograph?
Gray, somewhat darker than soft tissue
______ appears the most dense on radiographs as it absorbs the most x-rays?
What usually absorbs all x-rays and appears the "whitest"?
Metal (ex- bullets, barium)
What is the term used for "white" on a conventional radiograph?
What is the term used for "black" on a radiograph?
What is the term for white on a CT?
Increased (high) attenuation
Hyperintense or hyperdense
What is the term for black on a CT?
Decreased (low) attenuation
WHat is the term for "white" on a MRI?
Increased signal intensity
What is the term for "black" on an MRI?
Decreased (low) signal intesnity
What is the term for "white" on US?
What is the term for "black" on US?
In nuclear medicine what is the term for "white"?
Increased tracer uptake
In nuclear medicien what is the term for "black"
Decreased tracer uptake
In barium studies what is the term for white?
In barium studies what is "black"?
How much radiation do you get from flying in an airplane for an hour?
0.3 mrem/ hour
When are risks the greatest risks during pregnancy?
If you suspect there is a leakage in the intestines, what form of of contrast can't you use?
which takes longer, MRI or CT?
What is the contrast used with MRI?
In an MRI how does fat appear?
In an MRI how does CSF appear?
What is there a risk of with use of gadolinium?
Nephrogenic systemic fibrosis (NSF)
What type camera does nuclear medicine use?
What is an advantage of nuclear medicine?
Gives functional information
These are all examples of what? Technicium-99, Iodine-131, Fluoride-18
Radioactive elements for nuclear medicine
What can you do with a PET scan to get more detail?
Marry it up with a CT scan
Why can some people not get MRIs?
Can't hold still
PET scan allows you to see____ activity.
Metabolic activity. allows you to see how metabolic the tumor is
What is PEt scan used for?
What is the ideal imaging for children?
What appears white in an US?
Calcium, (ecogenic items)
What appears black in an US?
How do masses appear on US?
Dark Grey (hypoechoic)