3 brain Scanning Techniques
- Created by: ARobertson
- Created on: 18-03-16 19:58
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- 3 brain Scanning Techniques
- Computerised Axial Tomography (CAT scans)
- They tell us about the structure of the brain not the function.
- Cons
- Positron Emission Tomography (PET scans)
- 1. Patients are injected with a small amount of radioactive atoms known as FDG.
- Areas of higher activity will be shown as wormer colours like red.
- Areas of abnormal (very high or very low) activity indicate tumours or damage
- Cons
- Functional Magnetic Resonance Imaging (fMRI scan)
- They were developed in the 1990s to avoid exposure to radiation.
- 1. The head is placed in a large electromagnet
- 2.The nuclei in the hydrogen molecules in the blood align themselves with the direction of the magnetic field.
- 3. The blood flow in the brain increases in the active areas, bringing glucose and oxygen.
- 4. The oxygen is carried to the neurons in the haemoglobin of red blood cells.
- 5. When haemoglobin is oxygenated it repels the magnetic field, but when it is deoxygenated will follow the direction of the magnetic field.
- 6. The scanner detects these changes and turns it into an image, it shows where the activity is in the brain when the patient completes a task
- 5. When haemoglobin is oxygenated it repels the magnetic field, but when it is deoxygenated will follow the direction of the magnetic field.
- 4. The oxygen is carried to the neurons in the haemoglobin of red blood cells.
- 3. The blood flow in the brain increases in the active areas, bringing glucose and oxygen.
- 2.The nuclei in the hydrogen molecules in the blood align themselves with the direction of the magnetic field.
- Pros
- It doesn't need injections or radioactive material.
- Cons
- The patient has to be in a small noisy space which may cause stress
- Patients with 'pacemakers' or metal surgical implants can't use these scans as they use an electromagnet
- Computerised Axial Tomography (CAT scans)
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