Flashcards in Neuroimaging Essentials Deck (13):
What are the advantages of MRI?
– Best imaging of brain and spinal cord
– Multiple views (axial, sagittal, coronal) available
– No radiation exposure
What are the disadvantages of MRI?
– Longer scanning time, images degraded by patient movement
– Prohibited in presence of pacemakers or certain implanted metal
– Tight, enclosed scanner is difficult for claustrophobic patients
What are the advantages of CT?
– Shorter scanning time (advantages for unstable or agitated
What are the disadvantages of CT?
– Radiation exposure
– Axial views, needs image reformatting to obtain other views
What is the contrast agent in MRI?
What is the contrast agent in CT?
Highlights anatomy with CSF being dark
Highlights pathology with CSF being bright
Fluid Attenuation Recovery - similar to T2W but high signal bright CSF is removed
What type of MRI will lesions be bright on?
How does acute hemorrhage change on a CT scan over time?
Starts hyper dense and eventually becomes isodense and then hypodense (black)
What is the best imaging for acute infarction?
Diffusion Weighted MRI