Neuroradiology Flashcards
What colour is soft tissue on X ray?
Grey
What colour is air on X ray?
Black
What colour are bones on X ray?
White
What colour are bones on CT?
White
What colour is air on CT?
Black
What colour is CSF on CT?
Black
What colour is the brain on CT?
Grey with subtle grey-white matter difference
What colour is the skull on MRI?
Black
What colour is subcutaneous fat on MRI?
White
What colour is CSF on MRI?
White
Which of CT or MRI has better white-grey matter differentiation?
MRI
Common indications to perform CT scan (neuro)
Head trauma Acute stroke Headache Cancer (metastatic brain tumours) Post surgical (hydrocephalus, haemorrhage)
Reasons not to perform a CT scan
Minor head trauma (exclusion criteria)
Seizure (generally chose MRI)
Indications to perform MRI scan (neuro)
Demyelination CNS tumours Spine for intervertebral disc prolapse TIA Epilepsy Paediatric neurology Headache Cancer
Contraindications to MRI
Implanted electronics - defibs - pacemakers - cochlear implants - programmable shunts - insulin pumps Moveable metallic implants - aneurysm clips - heart valves - recent intraabdominal clips Claustrophobia Pregnancy Tattoos
What is PET usually used for?
To map out glucose useage
Where is increased metabolism seen on a PET scan?
Tumour
Inflammation
Infection
Leftover tumour after resection
What would angiography by used to diagnose in neuro?
Aneurysm
AV malformation
Carotidcaveronous fistula
Unstoppable epistaxis
Definition of CT perfusion
The volume of blood passing through a defined volume of tissue per unit time
What are 4 important neurological emergencies?
Trauma
Acute stroke
Cauda equina compression
SAH
What physiological information does radionucleotide radiology give?
Glucose metabolism
Perfusion
Dopamine uptake receptors
