Brain Imaging Flashcards Preview

Neurology > Brain Imaging > Flashcards

Flashcards in Brain Imaging Deck (26)
1

In a T2 weighted MRI scan does water show up bright or dark?

Bright

2

In a T1 weighted MRI scan does water show up bright or dark?

Dark

3

In which MRI scan (T1 or T2) is anatomical resolution better?

T1

4

In which MRI scan (T1 or T2) is pathological tissue highlighted?

T2

5

On a brain MRI you see that the ventricles show up bright white. Is this a T1 or T2 weighted image?

T2

6

Describe how you would get a CT angiogram?

CT image during and immediately after pumping in a bolus of iodine contrast

7

Describe how you would get a CT venogram?

CT image 2.3 seconds after pumping in a bolus of iodine contrast

8

When would you get iodine contrast showing up in the brain? How would you look for this on a CT?

If the blood brain barrier has been disrupted by tumours or inflammation. CT scan taken 5 minutes after iodine contrast injection.

9

What test would you want to do in a young women who has suffered from a confirmed spontaneous subarachnoid haemmorhage?

Angiography

10

What is the gold standard test for imaging blood vessels in the neck and intracranially?

Digital Subtraction angiography

11

What kind of aneurysm involves all layers of the vessel wall and most commonly arises at arterial bifurcation points?

Saccular aneurysms

12

What is the first line imagining to do in someone who has presented with a suspected subarachnoid haemorrhage?

CT scan

13

What is the treatment for a berry aneurysm?

Craniotomy and clipping
Endovascular treatment

14

Describe the endovascular treatment used in brain aneurysms?

Detachable platinum coils are put into the aneurysm to slow the blood flow in and out and allow thrombosis to occur which will eventually seal the aneurysm

15

Describe the angiography procedure

Contrast is injected into the aortic arch and into the carotid or vertebral arteries and X rays are taken.

16

What is the first line imagine technique for a suspected subarachnoid haemmorhage?

Non contrast CT

17

What colour does blood show up on a CT?

Bright

18

Why might you get hydrocephalus with a large volume sub arachnoid haemmorhage?

Blood might spread throughout the basal cisterns and extend into the ventricles. This obstructs CSF drainage and can cause hydrocephaul

19

If you have a confirmed SAH on CT what imaging test would you want to do next?

Cerebral angiogram

20

If there is strong clinical suspicious of a SAH but the CT looks normal what test would you do?

Lumbar pucture to look for elevated red cell count

21

Where is a subdural haematoma?

Between the dura and arachnoid

22

What causes a subdural haemoatoma?

Rupture of the veins that cross this space

23

Who is most at risk of a subdural haematoma?

Those with cerebral atrophu as the subdural space is larger and the veins are at increased risk of injury.

24

Where is an extradural haematoma?

Between the skull and the dura

25

What causes an extradural haematoma?

Traims causing damage to the middle meningeal artery

26

What is the shape of extradural haematoma on CT?

Lens shaped