Intro to Neuroradiology Flashcards
How is electromagnetic radiation created?
electron beam targets tungsten –> radiation
What are the pros and cons of XR?
pros: cheap, fast
cons: radiation, lack of soft tissue detail
What is fluoroscopy?
real-time X ray
used for diagnosis and intervention (swallow studies, angiography, myelography)
*uses contrast
What are the pros and cons of barium swallow?
pros: live demo of swallow coordination
cons: time consuming, contrast, radiation
What is myelography?
ueses fluoroscopy
cervical or lumbar puncture
inject contrast intrathecally –> can see spinal cord
f/u w/ CT to eval contrast
What do you use myelography for?
spinal stenosis, nerve root compression
CSF leak
if MRI contraindicated
Which imaging technique can allow you to see the subarachnoid space?
myelography
what imaging technique can be used to quantitate blood velocity?
U/S
What are Hounsfield units?
measure radiodensity
0 HU = water
What is white and dark in CT?
hyperdense = white hypodense = dark
What body substances are less dense than water?
fat
air
What are the level and window of the houndsfield scale?
level = center of window
window = width of HU in generated view of CT
narrow windows compare areas w/ similar densities
What is the major pro of CT?
most beneficial for ruling out large pathology
when would you use CT contrast?
neoplasm
infection
vascular disease
inflammatory disease
What type of contrast is used in CT?
In MRI?
CT = iodine
MRI = gadolinium
*both bright on imaging
