Distinguish structural from functional imaging, trace PET tracer uptake or fMRI signals to active tissue, and evaluate resolution, contrast, radiation and practical limits.
The brain is responsible for processing information and coordinating responses.
Seizures in the brain can be investigated using different imaging techniques.
Which one of the following statements is correct?
CT scans are produced by the absorbance of magnetic fields
CT scans are produced by the absorbance of radio waves by deoxyhaemoglobin
CT scans produce a cross-sectional image of a thin slice through the body
CT scans can be used to study brain activity while a person is undertaking tasks
C
During a seizure, part of the brain will be overactive.
Describe how positron emission tomography (PET) could be used to identify the part of the brain involved.
A description that includes three of the following points:
- isotope \{that emits positrons / is incorporated into glucose\} (1)
- more active neurones with increased respiration (1)
- will require increased supply of glucose (1)
- positrons (emitted from glucose) produce gamma rays that detected and are converted into an image (1)
Accept suitable named isotope e.g. carbon-11 or oxygen-15, radioactive material in glucose
Accept will \{absorb/use\} more glucose
(3)