QuestionSBA
QuestionChoice
Although both modalities have their advantages and disadvantages, CT scans are much faster than MRI and are therefore the investigation of choice in trauma and other acute neurological presentations.
10004605
e
MRI scans are much faster than CT scans, so are more commonly used in trauma and other emergencies
QuestionChoice
Acute infarcted areas may not be visible with CT. In suspected acute ischaemic stroke, the main purpose of a CT head scan is to exclude intracranial haemorrhage, which would show as hyperdense (light) areas.
10004601
a
Acute infarcts may not be visible with CT
QuestionChoice
This is an application of diffusion-weighted MRI, although this modality is achieved by combining T2-weighted images with restricted diffusion of water, not T1.
10004604
d
Diffusion-weighted MRI imaging combines T1-weighted images with restricted diffusion of water, allowing the visualisation of acute strokes
QuestionChoice
CSF appears dark, but fat appears white on the T1-weighted MRI. In the more commonly used T2-weighted imaging, fat, CSF and other fluids all appear white.
10004603
c
In T2-weighted MRI imaging, CSF appears dark
QuestionChoice
White matter does appear darker on CT, however, this is due to its lower density than grey matter.
10004602
b
White matter appears darker on CT imaging due to its high density
Concept
Chapter
2693
4308
Indications for CT
Topic
135
General surgery
13467
Which statement best describes a feature of imaging modalities commonly used in neurology?
a