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Description
Flashcards by Cecily Russell, updated more than 1 year ago
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Created by Cecily Russell
about 6 years ago
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| Question | Answer |
| What does CT stand for? | Computerised Axial Temography |
| How do CT scans work? | They use thousands of narrow beam X-rays rotated around patient from different angles. Each beam is attenuated according to tissue densities. Different soft tissues can be identified. |
| What are X Rays absorbed by? | Dense materials |
| What are some limitations/concerns with x-rays? | Limited reslution so small structures can't be indentified. Ionising radiation that can be harmful to cells. |
| What does MRI stand for? | Magnetic resonance imagine |
| What can an MRI be used for? | Diagnosis of tumours, stroke, brain injury and infections |
| How does an MRI work? | Uses a magnetic field and radio waves to detect soft tissue. Magnetic field runs down tube, another field is superimposed. The combined fields causes axis and frequency of the spin of H nuclei to change, taking energy from the radio waves to do so. When the radio waves are turned off, H nuclei return to original alignment and release absorbed energy. This is detected and sent to a computed for an image. |
| What does fMIR stand for? | Functional magnetic resonance imaging |
| What is a specific benefit of fMIR? | Can produce information of the brain in action such as memory, emotion and consciousness. |
| How does an fMIR work? | It follows the uptake of O2 in activa areas. Deoxyhaemoglobin absorbs the radio waves but oxyhaemoglobin does not. Increased neural activity leads to increased oxygen demand thus increased blood flow. The less signal absorbed, the higher the level of activity |
| If a subject persormes voluntary actions what areas of the brain would you expect to be active? | The cerebellum as it coordinates movement as it is carried out. And motor cortex in the frontal lobe. |
| What does the hypothalamus connect to? | The pituitary Gland |
| Where does the optic nerve pass through? | Synapses in thalamus then the primary visual cortex |
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