Imaging of Neurodegenerative and Cognitive Disorders Flashcards
When looking at an T1 sequence MRI scan, which of the following is NOT correct?
1 - CSF = white
2 - grey matter = grey
3 - white matter = white
4 - CSF = black/grey (low signal)
1 - CSF = white
- CSF is white on a T2 scan
- grey matter = neuronal cell bodies = grey
- white matter = axons = white
When looking at an T2 sequence MRI scan, which of the following is NOT correct?
1 - CSF = white (high signal)
2 - grey matter = white
3 - white matter = grey
4 - grey matter = grey
4 - grey matter = grey
- grey matter = neuronal cell bodies = white
- white matter = axons = grey
In a T2 MRI scan, does pathology typically have a high or low signal?
- high signal
- typically occurs whiter as tumour cells contain a lot of water
In a T1 MRI scan, does pathology typically have a high or low signal?
- low signal
- typically grey or darker
In a Fluid Attenuated Inversion Recover (FLAIR), which of the following is NOT correct?
1 - CSF = high signal and appears whiter
2 - CSF = high signal but attenuated so appears black
3 - grey matter = high signal and appears whiter
4 - white matter = low signal and appears darker
1 - CSF = high signal and appears whiter
- FLAIR produces a strong T2 image, BUT suppresses the CSF signal (which is normally white) and minimises the contrast between grey matter (normally appear light grey) and white matter (normally appears dark grey)
- grey matter = neuronal cell bodies
- white matter = axons
In a Fluid Attenuated Inversion Recover (FLAIR) does pathology have a high or low signal?
- high signal
- FLAIR is good to separate CSF from pathology with high sensitivity for pathology
- FLAIR produces a strong T2 image, BUT suppresses the CSF signal (which is normally white) and minimises the contrast between grey matter (normally appear light grey) and white matter (normally appears dark grey)
- grey matter = neuronal cell bodies
- white matter = axons
In a diffuse weighted image does the brain appear darker or lighter in a healthy patient?
- darker
In a diffuse weighted image does pathology appear lighter or darker?
- lighter
- often this is the best imaging to diagnose strokes
- abscess, infection and cholesteatoma can also be identified well using this approach
Which of the following techniques of MRI are most sensitive for detecting changes and pathophysiology associated with blood?
1 - FLAIR
2 - T2
3 - echo-T2
4 - diffuse weighted
3 - echo-T2
- blood appears black
The memory clinical report assessment parameters include the following:
- medial temporal atrophy score (MTA) scored 0-4
- Fazekas score to assess for vessel disease scored 0-3
- global corticoid atrophy score to assess atrophy of the whole brain scored 0-3
Which of these would be most appropriate when assessing patients with Alzheimer’s?
- medial temporal atrophy score (MTA) scored 0-4
- temporal atrophy is common in Alzheimers disease
The memory clinical report assessment parameters include the following:
- medial temporal atrophy score (MTA) scored 0-4
- Fazekas score to assess for vessel disease scored 0-3
- global corticoid atrophy score to assess atrophy of the whole brain scored 0-3
Which of these would be most appropriate when assessing patients with vascular dementia?
- Fazekas score to assess for vessel disease scored 0-3
What is the most common cause of dementia?
1 - vascular dementia
2 - Alzheimer’s
3 - frontal lobe dementia
4 - parkinsons disease
2 - Alzheimer’s
The medial temporal atrophy score (MTA) scored 0-4 is part of the memory clinical report assessment parameters include the following. Specifically which part of the brain does this focus on?
1 - amygdale
2 - hippocampus
3 - peririhinal cortex
4 - mammillary body
2 - hippocampus
The medial temporal atrophy score (MTA) scored 0-4 is part of the memory clinical report assessment parameters include the following. 3 is the worst score and 0 is the best score. What age does the patient have to be for an MTA score >3 to be classed as abnormal?
1 - >50
2 - >65
3 - >75
4 - >80
3 - >75
- an MTA >2 is abnormal in those <75
Although hippocampal atrophy is most common in Alzheimers, which of the following is NOT a differential for this?
1 - frontal lobe dementia
2 - parkinsons disease
3 - previous infection (herpes encephalitis)
4 - autoimmune condition
2 - parkinsons disease
- patient history of cognitive decline would confirm the Alzheimers diagnosis
- previous trauma and/or infection with no cognitive decline should make us think of other causes