Neuroimaging

Question 1

Answer 1

Question 2

describe a digital subtraction angiography

Answer 2

• native x-ray is taken followed by conventional angiograph
• the angiograph is digitally subtracted from the native x-ray, yielding a dark image of the vessels with attenuation of dense structures

Question 3

Answer 3

Question 4

Answer 4

Question 5

Answer 5

Question 11

descibe what a FLAIR image is

Answer 11

• FLAIR is a specialized T2 variant that may better reveal lesions from multiple sclerosis than a standard T2-weighted scan since it darkens the CSF

Question 12

contrast T1 vs T2 MRI

Answer 12

• T1
  
  • differentiates gray-white and shows structure in detail (CSF is dark)
  • infarctions are visible
• T2
  
  • CSF is white
  • weak differentiation of white and gray
  • shows edema and hence neuropathology

Question 13

describe PET (positron emission tomography)

Answer 13

• evaluation of the distribution of radioactive isotopes by a computational method (like CT, MRI) to show metabolism (e.g. glucose) in the brain

Question 14

describe single photon emission computerized tomography (SPECT)

Answer 14

• evaluation of the distribution of radioactive isotopes by a computation method (like CT, MRI) to show perfusion in the brain