Flashcards in Neuroradiology Deck (21)
What are the indications for brain imaging?
Headache/ raised ICP
Loss of consciousness/ neurological deficit
What are common causes of headache/ raised ICP?
What are common causes for seizures?
What are common causes for weakness/ stroke?
What are common trauma issues that require brain imaging?
What are common causes for loss of consciousness/ neurological deficit?
What are common post-op complications requiring brain imaging?
What are the positives of CT?
Axial acquisition with 3D reconstruction
Excellent bony details
Compatible with emergency/ ICU equipment
What are the negatives of CT?
Poor soft tissue detail
Multiplanar reconstruction but no direct multiplanar acquisition
What are the positives of MRI?
Excellent contrast/ soft tissue resolution
Excellent depiction of anatomy
Marrow and cord pathologies
What are the negatives of MRI?
Less bony detail
Less spatial resolution
Not compatible with pacemakers and many implants
Not compatible with most ICU/ emergency equipment
Not as quick as CT
What will T1 MRI show?
Fat and the 4 Ms:
Methemoglobin (subacute haematoma)
Mineral deposition (Ca, Mg, Mn)
Mush (highly proteinaceous fluid)
What will a T2 MRI show?
Fluid collections, oedema, demyelination, gliosis, tumours
What colour is CSF in T1?
What colour is CSF in T2?
What colour is myelin in T2?
White - fatty
What is a cavernoma?
A cluster of abnormal blood vessels
Which mode of imaging is best for trauma?
Which mode of imaging is best for identification of aneurysms?
Which mode of imaging is best for the spinal cord?